Ermias Haile - Academia.edu (original) (raw)

Papers by Ermias Haile

Journal of analytical methods in chemistry, 2017

The effect of Cr(VI) pollution on the corrosion rate of corrugated iron roof samples collected fr... more The effect of Cr(VI) pollution on the corrosion rate of corrugated iron roof samples collected from tanning industry areas was investigated through simulated laboratory exposure and spectrophotometric detection of Cr(III) deposit as a product of the reaction. The total level of Cr detected in the samples ranged from 113.892 ± 0.17 ppm to 53.05 ± 0.243 ppm and showed increasing trend as sampling sites get closer to the tannery and in the direction of tannery effluent stream. The laboratory exposure of a newly manufactured material to a simulated condition showed a relatively faster corrosion rate in the presence of Cr(VI) with concomitant deposition of Cr(III) under pH control. A significant (𝑃 = 0.05) increase in the corrosion rate was also recorded when exposing scratched or stress cracked samples. A coupled redox process where Cr(VI) is reduced to a stable, immobile, and insoluble Cr(III) accompanying corrosion of the iron is proposed as a possible mechanism leading to the elevated deposition of the latter on the materials. In conclusion, the increased deposits of Cr detected in the corrugated iron roof samples collected from tanning industry zones suggested possible atmospheric Cr pollution as a factor to the accelerated corrosion of the materials.

International Journal of Analytical Chemistry, 2016

This study was conducted to determine the spatial levels of chromium contamination of water, agri... more This study was conducted to determine the spatial levels of chromium contamination of water, agricultural soil, and vegetables in the leather tanning industrial areas using spectrophotometric methods. The results showed elevated accumulation of total Cr ranging from10.85±0.885 mg/L to39.696±0.326 mg/L,16.225±0.12 mg/Kg to1581.667±0.122 mg/Kg, and1.0758±0.05348 mg/Kg to11.75±0.206 mg/Kg in water, agricultural soil, and vegetable samples, respectively. The highest levels of chromium (VI) found from the speciation study were2.23±0.032 mg/Kg and0.322±0.07 mg/L in soil and water samples, respectively, which decreased with distance from the tannery. Among the vegetables, the highest load of Cr(VI) was detected in onion root (0.048±0.065 mg/Kg) and the lowest (0.004±0.007 mg/Kg) in fruit of green pepper. The detected levels of Cr in all of the suggested samples were above the WHO permissible limits. The variations of the levels Cr(III) and Cr(VI) contamination of the environment with dista...

Food Science and Quality Management, 2018

The aim of this work was to study the effectiveness of a coagulant that removes different polluta... more The aim of this work was to study the effectiveness of a coagulant that removes different pollutants. Adsorbent dose, contact time, and temperature in different turbidity were evaluated. The adsorbent dose were varied from 20-160 mg/l. The time were varied from 10 min-310 min. The optimal conditions of adsorption obtained were 100 mg/l of adsorbent dose and 45 min contact time for high turbid (361 to 465 NTU) water and 40 mg/l for low turbid (36.8 to 39.9 NTU) water. Moringa stenopetala is effective for high turbidity (98.5%). From 0.1 mg/l initial concentration of the metals, the highest removal efficiency of 82.9% was found for Pb and the lowest for Cr (53.18%). The results showed better fit by the Freundlich models, describing a multilayer adsorption. The thermodynamic studies suggested that a high temperature favors for the adsorption of heavy metals on M. stenopetala, indicating a spontaneous adsorption process.

chemistry and materials research, 2016

Samples were collected from Lake Hawassa, from six selected sampling sites. The measured physico-... more Samples were collected from Lake Hawassa, from six selected sampling sites. The measured physico-chemical parameters in lake water ranged pH(7.70-8.69), TDS(437-495 mg/L), EC(0.729-0.825 mS/cm), DO(6.2-14.6 mg/L), Temp.(20.7-23.4 0 C), Turb.(6.3-26.7 NTU), SO4 2-(25-16), Cl-(42-23), F-(17.4-5.36), NO3-N (2.38-11.79), PO4 3-(0.81-1.55), COD(219-1216), and BOD5(104-590) mg/L. The concentration of detected metals in water samples were in the range Cu(0.226-0.117), Mn(0.166-0.068), Zn(0.253-0.145), Mg(35.91-14.27), Ca(57.11-35.23), Na(87.49-87.49) and K(73.02-34.26) in mg/L. According to stream and potable waters standard recommendation, the maximum value of BOD5, COD, PO4 3and Fwere above the acceptable range. The detectable metal concentration in water samples analyzed were Na>Ca>K>Mg>Zn>Cu>Mn. The concentration of Mn in the present study was above USEPA but below WHO guideline. The dendrogram figure shows that metal parameter of water samples at S1 the pollution level is higher than the other sites. All the transfer factors of water were greater than 1 in fish muscle.

Food Science and Quality Management, 2018

Despite the great role of wild edible plants (WEPs) in ensuring food security and the fact that t... more Despite the great role of wild edible plants (WEPs) in ensuring food security and the fact that they can serve as a source of income, the consumption and acceptance varies from place to place. Although social, economic and cultural factors might have contributed for the avoidance of some edible wild plants, the fear of presence of toxic principles including heavy metals or their counter ions and antinutritional components might also be a barrier to the use of WEPs. In this study, the determination of the levels of some selected heavy metals (Cu, Cr, Ni, Cd and Pb) and antinutritional (oxalate) components are carried out using Flame Atomic Absorption Spectrophotometry and HPLC methods. The results showed that the mean metal concentration (mg/kg) in ripe fruit of WEP, unripe fruit of WEP and their underlying soil samples were 4.57, 5.77 and 3.22 (Cu), 2.37, 1.54, and 3.54 (Pb), 0.93, 0.63, and 0.42 (Cd), 2.02, 2.09, and 2.24 (Ni) and 2.47, 2.09, and 2.24 (Cr) respectively.The amounts of oxalate (mg/kg) in WEPs (Ripe Dovyalis Abyssinica, Unripe Dovyalis Abyssinica Unripe Ficus Sur Forresk and Unripe Blackberry) were 359.93, 301.01, 815.08 and 1406.15 mg/Kg respectively. All the heavy metals considered in this study and oxalate contents were detected in both WEPs and their underlying soil samples. The highest concentration of the heavy metals was found in blackberry while the lowest in unripe strawberry. Using one way ANOVA, significant (P = 0.05) variations among the levels of heavy metals in ripe and unripe were recorded. Generally, the content of heavy metals was higher in most of WEPs than their underlying soils. In conclusion, on the basis of the level of heavy metals and oxalate content, blackberry is found to be less safe for consumption than other WEPs considered in this study.

The Effect of Wet Coffee Processing Plant Effluent on Physicochemical and Bacteriological Quality of Receiving Rivers Used by Local Community: Case of Aroresa District, Sidama, Ethiopia

Environmental Health Insights

Freshwater bodies such as lakes, rivers, and their biodiversity are being threatened with water p... more Freshwater bodies such as lakes, rivers, and their biodiversity are being threatened with water pollution from industrial effluents and household sewages. The main objective of this study is to assess the effects of wet coffee processing plants effluent on the physicochemical and bacteriological properties of receiving rivers. Four rivers and 4 sampling points of the selected rivers were included in the study. Focus group discussion and interview were employed to gather primary data. The result showed that parameters of water quality for downstream of the rivers were significant, particularly in the dry season with BODs ranging from 45 ± 1 to 782.6 ± 97 g/ml, COD ranges from 71 ± 21 to 1072 ± 183 g/ml, Conductivity ranges from 75.5 ± 6.6 to 943 ± 56.3, Turbidity ranges from 7 ± 0.43 to 105 ± 6.2, TDS ranges from 62 ± 6.4 to 1059.6 ± 121 g/ml, temperature ranges from 20.1 to 33 ± 1, T. coli form ranges from 77 ± 1.1 to 493 ± 66 and E. coli ranges from 28 ± 1 to 213 ± 41 were signific...

Food Science and Quality Management, 2018

Despite the great role of wild edible plants (WEPs) in ensuring food security and the fact that t... more Despite the great role of wild edible plants (WEPs) in ensuring food security and the fact that they can serve as a source of income, the consumption and acceptance varies from place to place. Although social, economic and cultural factors might have contributed for the avoidance of some edible wild plants, the fear of presence of toxic principles including heavy metals or their counter ions and antinutritional components might also be a barrier to the use of WEPs. In this study, the determination of the levels of some selected heavy metals (Cu, Cr, Ni, Cd and Pb) and antinutritional (oxalate) components are carried out using Flame Atomic Absorption Spectrophotometry and HPLC methods. The results showed that the mean metal concentration (mg/kg) in ripe fruit of WEP, unripe fruit of WEP and their underlying soil samples were 4.57, 5.77 and 3.22 (Cu), 2.37, 1.54, and 3.54 (Pb), 0.93, 0.63, and 0.42 (Cd), 2.02, 2.09, and 2.24 (Ni) and 2.47, 2.09, and 2.24 (Cr) respectively.The amounts ...

Food Science and Quality Management, 2018

The aim of this work was to study the effectiveness of a coagulant that removes different polluta... more The aim of this work was to study the effectiveness of a coagulant that removes different pollutants. Adsorbent dose, contact time, and temperature in different turbidity were evaluated. The adsorbent dose were varied from 20–160 mg/l. The time were varied from 10 min– 310 min. The optimal conditions of adsorption obtained were 100 mg/l of adsorbent dose and 45 min contact time for high turbid (361 to 465 NTU) water and 40 mg/l for low turbid (36.8 to 39.9 NTU) water. Moringa stenopet ala is effective for high turbidity (98.5%). From 0.1 mg/l initial concentration of the metals, the highest removal efficiency of 82.9% was found for Pb and the lowest for Cr (53.18%). The results showed better fit by the Freundlich models, describing a multilayer adsorption. The thermodynamic studies suggested that a high temperature favors for the adsorption of heavy metals on M. stenopetala , indicating a spontaneous adsorption process. Keywords: M.stenopetala , Wastewater Treatment, Adsorption iso...

chemistry and materials research, 2018

The current boom in construction sector of the country has aroused scientific concern about the s... more The current boom in construction sector of the country has aroused scientific concern about the safety of construction workers who regularly work with cement. The aim of this study was to determine the levels of selected heavy metals (Cr, Pb, Cd, Cu and Ni) in branded cement samples (Mugher, Dangote, Capital, and Derba) and soils around the Mugher cement factory. The level of the selected heavy metals in cement and soil samples were analyzed by Flame Atomic Absorption Spectroscopy. The detected range of metal concentrations (mg/kg dry mass) in different cement sample were Cu (0.131 ± 0.021-0.302 ± 0.004), Cd (0.02 ± 0.008-0.023 ± 0.008), Pb (0.187 ± 0.042- 0.353 ± 0.016), Cr (0.185 ± 0.017 - 0.765 ± 0.017), Ni (0.233 ± 0.002 - 0.906 ± 0.290) in ppm. Among the tested heavy metals Ni was found in highest concentration and it was in Capital cement sample. The heavy metal levels in the studied samples not comply with international standards. The detected range of the heavy metals in soi...

chemistry and materials research, 2016

Samples were collected from Lake Hawassa, from six selected sampling sites. The measured physico-... more Samples were collected from Lake Hawassa, from six selected sampling sites. The measured physico-chemical parameters in lake water ranged pH(7.70-8.69), TDS(437-495 mg/L), EC(0.729-0.825 mS/cm), DO(6.2-14.6 mg/L), Temp.(20.7-23.4 0 C), Turb.(6.3-26.7 NTU), SO 4 2- (25-16), Cl - (42-23), F - (17.4-5.36), NO 3 -N (2.38-11.79), PO 4 3- (0.81-1.55), COD(219-1216), and BOD 5 (104-590) mg/L. The concentration of detected metals in water samples were in the range Cu(0.226-0.117), Mn(0.166-0.068), Zn(0.253-0.145), Mg(35.91–14.27), Ca(57.11-35.23), Na(87.49-87.49) and K(73.02-34.26) in mg/L. According to stream and potable waters standard recommendation, the maximum value of BOD 5 , COD, PO 4 3- and F - were above the acceptable range. The detectable metal concentration in water samples analyzed were Na>Ca>K>Mg>Zn>Cu>Mn. The concentration of Mn in the present study was above USEPA but below WHO guideline. The dendrogram figure shows that metal parameter of water samples at ...

American Journal of Essential Oils and Natural Products, 2015

Smelling a delightful aroma can be a very pleasurable experience with potential salutary benefits... more Smelling a delightful aroma can be a very pleasurable experience with potential salutary benefits. The natural aroma of the mango plant varieties is different, implying that the chemical compositions of the components are likely to be different. In this study we focused on the analysis and identification of volatile aroma components of the leaves of six mango varieties; Ngowe, Apple, Keit, Boribo, Tommy, Atkins and Van Dyke grown in Kenya in the same agro ecological area. The hydro-distilled oil from the leaves of these mango varieties were analyzed by gas chromatograph fitted with a flame ionization detector and coupled to a mass spectrometer. It was found that the chemical profile of all the six varieties were qualitatively and quantitatively different. The oils were rich in monoterpenes (46.98%), sesquiterpene (38.17%) with minor quantities of their analogues (10.67%) Trace amounts of nonterpenoid hydrocarbons and oxygenated hydrocarbons accounting for (4.19%) were also identifie...

Clerodendrum myricoides is a plant traditionally used for treatment of rheumatism, asthma, inflam... more Clerodendrum myricoides is a plant traditionally used for treatment of rheumatism, asthma, inflammatory diseases, coughs, skin diseases, vermifuge, febrifuge and malaria. Phytochemical screening of the CH2Cl2/CH3OH (1:1) and CH3OH (100%) root extracts of the plant revealed the presence of phenolic compounds, steroids, flavonoids, saponins and terpenes. Chromatographic separation of CH2Cl2/CH3OH (1:1) root extract of C. myricoides yielded a new phenylpropanoid glycoside (1) together with a known phenylpropanoid glycoside, verbascoside-6 III-apiose (2). The structures of these compounds were determined using spectroscopic techniques (UV-Vis, IR and NMR, 1D and 2D).

Sediment and fish (nile Tilapia, Oreochromis niloticus) were collected from six sites of Lake Haw... more Sediment and fish (nile Tilapia, Oreochromis niloticus) were collected from six sites of Lake Hawassa namely; Tikur Wuha, Amora Gedel, Dorie Bafana, Central part of the lake, the opposite side of Amora Gedel and Referral Hospital sites. Concentration of heavy metals was analyzed quantitatively using Flame Atomic Absorption Spectrophotometer and Chemometric methods. The maximum and minimum mean levels (mg/kg dry mass) in different lake sediment sites were Cu (51.38-17.64), Mn (348.51-140.63), Cd (12.8764403), Pb (30.05-6.72), Ni (26.73-8.43 ), Zn (367.84-147.49), Cr (14.15-5.34), Co (27.199.59 ), Mg (3859.86-1872.43), Na (4913.72-2903.043), Ca (5526.74 3608.71), K (4229.69-2255.57) and that of fish muscle were Cu (13.833-5.666), Mn (11.972-9.722), Zn (21.110-12.055), Ca (574-482), Mg (512-437), Na (771-681), K (903-785). The result shows that the metal concentration in sediment samples is in order of Ca > Na > K > Mg > Zn > Mn > Cu > Pb > Co > Ni > Cr &g...

Journal of analytical methods in chemistry, 2017

The effect of Cr(VI) pollution on the corrosion rate of corrugated iron roof samples collected fr... more The effect of Cr(VI) pollution on the corrosion rate of corrugated iron roof samples collected from tanning industry areas was investigated through simulated laboratory exposure and spectrophotometric detection of Cr(III) deposit as a product of the reaction. The total level of Cr detected in the samples ranged from 113.892 ± 0.17 ppm to 53.05 ± 0.243 ppm and showed increasing trend as sampling sites get closer to the tannery and in the direction of tannery effluent stream. The laboratory exposure of a newly manufactured material to a simulated condition showed a relatively faster corrosion rate in the presence of Cr(VI) with concomitant deposition of Cr(III) under pH control. A significant (𝑃 = 0.05) increase in the corrosion rate was also recorded when exposing scratched or stress cracked samples. A coupled redox process where Cr(VI) is reduced to a stable, immobile, and insoluble Cr(III) accompanying corrosion of the iron is proposed as a possible mechanism leading to the elevated deposition of the latter on the materials. In conclusion, the increased deposits of Cr detected in the corrugated iron roof samples collected from tanning industry zones suggested possible atmospheric Cr pollution as a factor to the accelerated corrosion of the materials.

International Journal of Analytical Chemistry, 2016

This study was conducted to determine the spatial levels of chromium contamination of water, agri... more This study was conducted to determine the spatial levels of chromium contamination of water, agricultural soil, and vegetables in the leather tanning industrial areas using spectrophotometric methods. The results showed elevated accumulation of total Cr ranging from10.85±0.885 mg/L to39.696±0.326 mg/L,16.225±0.12 mg/Kg to1581.667±0.122 mg/Kg, and1.0758±0.05348 mg/Kg to11.75±0.206 mg/Kg in water, agricultural soil, and vegetable samples, respectively. The highest levels of chromium (VI) found from the speciation study were2.23±0.032 mg/Kg and0.322±0.07 mg/L in soil and water samples, respectively, which decreased with distance from the tannery. Among the vegetables, the highest load of Cr(VI) was detected in onion root (0.048±0.065 mg/Kg) and the lowest (0.004±0.007 mg/Kg) in fruit of green pepper. The detected levels of Cr in all of the suggested samples were above the WHO permissible limits. The variations of the levels Cr(III) and Cr(VI) contamination of the environment with dista...

Food Science and Quality Management, 2018

The aim of this work was to study the effectiveness of a coagulant that removes different polluta... more The aim of this work was to study the effectiveness of a coagulant that removes different pollutants. Adsorbent dose, contact time, and temperature in different turbidity were evaluated. The adsorbent dose were varied from 20-160 mg/l. The time were varied from 10 min-310 min. The optimal conditions of adsorption obtained were 100 mg/l of adsorbent dose and 45 min contact time for high turbid (361 to 465 NTU) water and 40 mg/l for low turbid (36.8 to 39.9 NTU) water. Moringa stenopetala is effective for high turbidity (98.5%). From 0.1 mg/l initial concentration of the metals, the highest removal efficiency of 82.9% was found for Pb and the lowest for Cr (53.18%). The results showed better fit by the Freundlich models, describing a multilayer adsorption. The thermodynamic studies suggested that a high temperature favors for the adsorption of heavy metals on M. stenopetala, indicating a spontaneous adsorption process.

chemistry and materials research, 2016

Samples were collected from Lake Hawassa, from six selected sampling sites. The measured physico-... more Samples were collected from Lake Hawassa, from six selected sampling sites. The measured physico-chemical parameters in lake water ranged pH(7.70-8.69), TDS(437-495 mg/L), EC(0.729-0.825 mS/cm), DO(6.2-14.6 mg/L), Temp.(20.7-23.4 0 C), Turb.(6.3-26.7 NTU), SO4 2-(25-16), Cl-(42-23), F-(17.4-5.36), NO3-N (2.38-11.79), PO4 3-(0.81-1.55), COD(219-1216), and BOD5(104-590) mg/L. The concentration of detected metals in water samples were in the range Cu(0.226-0.117), Mn(0.166-0.068), Zn(0.253-0.145), Mg(35.91-14.27), Ca(57.11-35.23), Na(87.49-87.49) and K(73.02-34.26) in mg/L. According to stream and potable waters standard recommendation, the maximum value of BOD5, COD, PO4 3and Fwere above the acceptable range. The detectable metal concentration in water samples analyzed were Na>Ca>K>Mg>Zn>Cu>Mn. The concentration of Mn in the present study was above USEPA but below WHO guideline. The dendrogram figure shows that metal parameter of water samples at S1 the pollution level is higher than the other sites. All the transfer factors of water were greater than 1 in fish muscle.

Food Science and Quality Management, 2018

Despite the great role of wild edible plants (WEPs) in ensuring food security and the fact that t... more Despite the great role of wild edible plants (WEPs) in ensuring food security and the fact that they can serve as a source of income, the consumption and acceptance varies from place to place. Although social, economic and cultural factors might have contributed for the avoidance of some edible wild plants, the fear of presence of toxic principles including heavy metals or their counter ions and antinutritional components might also be a barrier to the use of WEPs. In this study, the determination of the levels of some selected heavy metals (Cu, Cr, Ni, Cd and Pb) and antinutritional (oxalate) components are carried out using Flame Atomic Absorption Spectrophotometry and HPLC methods. The results showed that the mean metal concentration (mg/kg) in ripe fruit of WEP, unripe fruit of WEP and their underlying soil samples were 4.57, 5.77 and 3.22 (Cu), 2.37, 1.54, and 3.54 (Pb), 0.93, 0.63, and 0.42 (Cd), 2.02, 2.09, and 2.24 (Ni) and 2.47, 2.09, and 2.24 (Cr) respectively.The amounts of oxalate (mg/kg) in WEPs (Ripe Dovyalis Abyssinica, Unripe Dovyalis Abyssinica Unripe Ficus Sur Forresk and Unripe Blackberry) were 359.93, 301.01, 815.08 and 1406.15 mg/Kg respectively. All the heavy metals considered in this study and oxalate contents were detected in both WEPs and their underlying soil samples. The highest concentration of the heavy metals was found in blackberry while the lowest in unripe strawberry. Using one way ANOVA, significant (P = 0.05) variations among the levels of heavy metals in ripe and unripe were recorded. Generally, the content of heavy metals was higher in most of WEPs than their underlying soils. In conclusion, on the basis of the level of heavy metals and oxalate content, blackberry is found to be less safe for consumption than other WEPs considered in this study.

The Effect of Wet Coffee Processing Plant Effluent on Physicochemical and Bacteriological Quality of Receiving Rivers Used by Local Community: Case of Aroresa District, Sidama, Ethiopia

Environmental Health Insights

Freshwater bodies such as lakes, rivers, and their biodiversity are being threatened with water p... more Freshwater bodies such as lakes, rivers, and their biodiversity are being threatened with water pollution from industrial effluents and household sewages. The main objective of this study is to assess the effects of wet coffee processing plants effluent on the physicochemical and bacteriological properties of receiving rivers. Four rivers and 4 sampling points of the selected rivers were included in the study. Focus group discussion and interview were employed to gather primary data. The result showed that parameters of water quality for downstream of the rivers were significant, particularly in the dry season with BODs ranging from 45 ± 1 to 782.6 ± 97 g/ml, COD ranges from 71 ± 21 to 1072 ± 183 g/ml, Conductivity ranges from 75.5 ± 6.6 to 943 ± 56.3, Turbidity ranges from 7 ± 0.43 to 105 ± 6.2, TDS ranges from 62 ± 6.4 to 1059.6 ± 121 g/ml, temperature ranges from 20.1 to 33 ± 1, T. coli form ranges from 77 ± 1.1 to 493 ± 66 and E. coli ranges from 28 ± 1 to 213 ± 41 were signific...

Food Science and Quality Management, 2018

Despite the great role of wild edible plants (WEPs) in ensuring food security and the fact that t... more Despite the great role of wild edible plants (WEPs) in ensuring food security and the fact that they can serve as a source of income, the consumption and acceptance varies from place to place. Although social, economic and cultural factors might have contributed for the avoidance of some edible wild plants, the fear of presence of toxic principles including heavy metals or their counter ions and antinutritional components might also be a barrier to the use of WEPs. In this study, the determination of the levels of some selected heavy metals (Cu, Cr, Ni, Cd and Pb) and antinutritional (oxalate) components are carried out using Flame Atomic Absorption Spectrophotometry and HPLC methods. The results showed that the mean metal concentration (mg/kg) in ripe fruit of WEP, unripe fruit of WEP and their underlying soil samples were 4.57, 5.77 and 3.22 (Cu), 2.37, 1.54, and 3.54 (Pb), 0.93, 0.63, and 0.42 (Cd), 2.02, 2.09, and 2.24 (Ni) and 2.47, 2.09, and 2.24 (Cr) respectively.The amounts ...

Food Science and Quality Management, 2018

The aim of this work was to study the effectiveness of a coagulant that removes different polluta... more The aim of this work was to study the effectiveness of a coagulant that removes different pollutants. Adsorbent dose, contact time, and temperature in different turbidity were evaluated. The adsorbent dose were varied from 20–160 mg/l. The time were varied from 10 min– 310 min. The optimal conditions of adsorption obtained were 100 mg/l of adsorbent dose and 45 min contact time for high turbid (361 to 465 NTU) water and 40 mg/l for low turbid (36.8 to 39.9 NTU) water. Moringa stenopet ala is effective for high turbidity (98.5%). From 0.1 mg/l initial concentration of the metals, the highest removal efficiency of 82.9% was found for Pb and the lowest for Cr (53.18%). The results showed better fit by the Freundlich models, describing a multilayer adsorption. The thermodynamic studies suggested that a high temperature favors for the adsorption of heavy metals on M. stenopetala , indicating a spontaneous adsorption process. Keywords: M.stenopetala , Wastewater Treatment, Adsorption iso...

chemistry and materials research, 2018

The current boom in construction sector of the country has aroused scientific concern about the s... more The current boom in construction sector of the country has aroused scientific concern about the safety of construction workers who regularly work with cement. The aim of this study was to determine the levels of selected heavy metals (Cr, Pb, Cd, Cu and Ni) in branded cement samples (Mugher, Dangote, Capital, and Derba) and soils around the Mugher cement factory. The level of the selected heavy metals in cement and soil samples were analyzed by Flame Atomic Absorption Spectroscopy. The detected range of metal concentrations (mg/kg dry mass) in different cement sample were Cu (0.131 ± 0.021-0.302 ± 0.004), Cd (0.02 ± 0.008-0.023 ± 0.008), Pb (0.187 ± 0.042- 0.353 ± 0.016), Cr (0.185 ± 0.017 - 0.765 ± 0.017), Ni (0.233 ± 0.002 - 0.906 ± 0.290) in ppm. Among the tested heavy metals Ni was found in highest concentration and it was in Capital cement sample. The heavy metal levels in the studied samples not comply with international standards. The detected range of the heavy metals in soi...

chemistry and materials research, 2016

Samples were collected from Lake Hawassa, from six selected sampling sites. The measured physico-... more Samples were collected from Lake Hawassa, from six selected sampling sites. The measured physico-chemical parameters in lake water ranged pH(7.70-8.69), TDS(437-495 mg/L), EC(0.729-0.825 mS/cm), DO(6.2-14.6 mg/L), Temp.(20.7-23.4 0 C), Turb.(6.3-26.7 NTU), SO 4 2- (25-16), Cl - (42-23), F - (17.4-5.36), NO 3 -N (2.38-11.79), PO 4 3- (0.81-1.55), COD(219-1216), and BOD 5 (104-590) mg/L. The concentration of detected metals in water samples were in the range Cu(0.226-0.117), Mn(0.166-0.068), Zn(0.253-0.145), Mg(35.91–14.27), Ca(57.11-35.23), Na(87.49-87.49) and K(73.02-34.26) in mg/L. According to stream and potable waters standard recommendation, the maximum value of BOD 5 , COD, PO 4 3- and F - were above the acceptable range. The detectable metal concentration in water samples analyzed were Na>Ca>K>Mg>Zn>Cu>Mn. The concentration of Mn in the present study was above USEPA but below WHO guideline. The dendrogram figure shows that metal parameter of water samples at ...

American Journal of Essential Oils and Natural Products, 2015

Smelling a delightful aroma can be a very pleasurable experience with potential salutary benefits... more Smelling a delightful aroma can be a very pleasurable experience with potential salutary benefits. The natural aroma of the mango plant varieties is different, implying that the chemical compositions of the components are likely to be different. In this study we focused on the analysis and identification of volatile aroma components of the leaves of six mango varieties; Ngowe, Apple, Keit, Boribo, Tommy, Atkins and Van Dyke grown in Kenya in the same agro ecological area. The hydro-distilled oil from the leaves of these mango varieties were analyzed by gas chromatograph fitted with a flame ionization detector and coupled to a mass spectrometer. It was found that the chemical profile of all the six varieties were qualitatively and quantitatively different. The oils were rich in monoterpenes (46.98%), sesquiterpene (38.17%) with minor quantities of their analogues (10.67%) Trace amounts of nonterpenoid hydrocarbons and oxygenated hydrocarbons accounting for (4.19%) were also identifie...

Clerodendrum myricoides is a plant traditionally used for treatment of rheumatism, asthma, inflam... more Clerodendrum myricoides is a plant traditionally used for treatment of rheumatism, asthma, inflammatory diseases, coughs, skin diseases, vermifuge, febrifuge and malaria. Phytochemical screening of the CH2Cl2/CH3OH (1:1) and CH3OH (100%) root extracts of the plant revealed the presence of phenolic compounds, steroids, flavonoids, saponins and terpenes. Chromatographic separation of CH2Cl2/CH3OH (1:1) root extract of C. myricoides yielded a new phenylpropanoid glycoside (1) together with a known phenylpropanoid glycoside, verbascoside-6 III-apiose (2). The structures of these compounds were determined using spectroscopic techniques (UV-Vis, IR and NMR, 1D and 2D).

Sediment and fish (nile Tilapia, Oreochromis niloticus) were collected from six sites of Lake Haw... more Sediment and fish (nile Tilapia, Oreochromis niloticus) were collected from six sites of Lake Hawassa namely; Tikur Wuha, Amora Gedel, Dorie Bafana, Central part of the lake, the opposite side of Amora Gedel and Referral Hospital sites. Concentration of heavy metals was analyzed quantitatively using Flame Atomic Absorption Spectrophotometer and Chemometric methods. The maximum and minimum mean levels (mg/kg dry mass) in different lake sediment sites were Cu (51.38-17.64), Mn (348.51-140.63), Cd (12.8764403), Pb (30.05-6.72), Ni (26.73-8.43 ), Zn (367.84-147.49), Cr (14.15-5.34), Co (27.199.59 ), Mg (3859.86-1872.43), Na (4913.72-2903.043), Ca (5526.74 3608.71), K (4229.69-2255.57) and that of fish muscle were Cu (13.833-5.666), Mn (11.972-9.722), Zn (21.110-12.055), Ca (574-482), Mg (512-437), Na (771-681), K (903-785). The result shows that the metal concentration in sediment samples is in order of Ca > Na > K > Mg > Zn > Mn > Cu > Pb > Co > Ni > Cr &g...