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Papers by reham elkorashey

Three-dimensional mesoporous CeO2 hollow sphere (M-CeO2-HS) modified glassy carbon electrode (M-C... more Three-dimensional mesoporous CeO2 hollow sphere (M-CeO2-HS) modified glassy carbon electrode (M-CeO2-HS/GCE) was developed in this study as a very sensitive voltammetric sensor for detection of terazosin. This produced modifier was characterized by techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). There was a remarkable improvement in the electrochemical behavior relative to terazosin electro-oxidation on M-CeO2-HS/GCE surface, compared to bare GCE, in the optimized conditions of supporting electrolyte pH and casted modifier concentration. An oxidation peak was found for terazosin on modified electrode surface at the potential of about 0.57 V in phosphate buffer solution (pH=7.0). The linear dynamic range was 0.01 to 600.0 µM and the limit of detection was 1.9 nM with the aid of anodic peak of terazosin. Some advantages were reported for the modified electrode, including satisfactory reproducibility towa...

Environmental Technology & Innovation, 2022

This study investigates the water quality of El-Salam Canal with the objective of reconnoitering ... more This study investigates the water quality of El-Salam Canal with the objective of reconnoitering the possibility of implementing it for irrigation purposes. Water samples were collected from eight sites during the Over the period (Feb.- Sept. 2010). The samples were analyzed chemically and the obtained values were compared to the Food and Agricultural Organization (FAO), Water Environment Federation (WEF) and the World Health Organization (WHO). It was found that the water is capable to be used for irrigation purposes in the light of the pH, COD, BOD and heavy metals values but the values of EC, TDS, alkalinity, Na, Cl and fecal coliform might moderately restrict its implementation. It was concluded that receiving the water from Bahr Hadous drain with its inorganic salts and organic loads (i.e. due to the disposal of sewage, urban and agricultural runoff as well as industrial wastewater), increases the concentration of most of measured parameters of El-Salam Canal. The study, thus, ...

Human and Ecological Risk Assessment: An International Journal, 2019

Abstract In many arid and semi-arid regions, farmers are often obligated to informally use raw wa... more Abstract In many arid and semi-arid regions, farmers are often obligated to informally use raw wastewater for irrigating their crops. The impacts of wastewater irrigation on soil, crops, and human health were investigated, regarding trace metals and bacteria. Cr, Cu, Fe, Ni, and Zn were detected in wastewater. Cr, Cu, and Zn accumulated in soil and crops in the order rocket > clover > cabbage. The Health Risk Index reported risk from Cr and Zn in rocket. Fecal coliforms in wastewater and crops were detected along with Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa. The frequency (%) was 86.7% (cabbage), 66.7% (rocket), and 43.3% (clover). The multiple antibiotic resistance index (0.503) rendered crops high risk source for contamination. The comprehensive pollution index classified wastewater severely polluted (≥2.01). Conclusions deduced crops alternative reservoirs for trace metals and human pathogens. Recommendations included implementation of low cost treatment methods, holding irrigation 5–15 days before harvest, assuming citric and acetic acids reducing solutions for trace metals, and suggested ofloxacin, amoxycillin/clavulanate, and amikacin antibiotics against reported bacteria.

Water Science, 2016

It is with great appreciation that we acknowledge the following reviewers who have served our res... more It is with great appreciation that we acknowledge the following reviewers who have served our research community by reviewing manuscripts for Nutrients in 2011.

Regression analysis of water-quality data collected in 2004-06 was used to estimate concentration... more Regression analysis of water-quality data collected in 2004-06 was used to estimate concentrations for total nitrogen, ammonia, sodium, chloride, calcium, and biochemical oxygen demand. The explanatory variables examined for regression relations were monthly monitored properties of water-nitrate, electrical conductivity, chloride and chemical oxygen demand. For the conditions observed in 2004-06, nitrate was a significant explanatory variable for total nitrogen and ammonia estimated constituents, electrical conductivity was a significant explanatory variable for sodium and chloride estimated constituents, chloride was a significant explanatory variable for calcium estimated constituents, while chemical oxygen demand was a significant explanatory variable for biochemical oxygen demand estimated constituents. Water temperature pH, and dissolved oxygen were not statistically significant explanatory variables for any of the constituents in this study. The regression equations were evaluated using common measures of variability, including R2, or the proportion of variability in the estimated constituent explained by the regression equation. R2 values ranged from 68.0% for calcium concentration to 98.2% for total nitrogen concentration. By applying the developed regression equations on the fourth year of data collection 2007 to calculate the estimated concentrations and errors associated with these concentrations and calculating the median relative difference percentage (RDP) between measured constituent concentration and the constituent concentration estimated by the regression equations, the RPD values ranged from 0.82 for total nitrogen to 21.59 for chloride.

The physical and chemical properties and microbiological constituents of wastewater are important... more The physical and chemical properties and microbiological constituents of wastewater are important parameters in the design and operation of collection, treatment and use of treated effluent. Reuse of reclaimed wastewater may adversely affect public health and the environment of particular concern is degree of purification but also the selection of the most appropriate methods of irrigation and the water use efficiency by which wastewater is applied at the farmers level irrigation method and scheduling of irrigation are important components in the overall system for efficient and safe use of the reclaimed wastewater on environmentally sound bases. (Asano et al, 1984) Irrigation with wastewater has been extensively practiced with traditional irrigation methods over the centuries. Some of these methods are still used, but recently modern irrigation technology has been developed and widely accepted. This new technology, although very useful with all irrigation waters, might be of partic...

This study classifies Omar Bek drain water quality; its impact on Damietta branch and evaluates i... more This study classifies Omar Bek drain water quality; its impact on Damietta branch and evaluates its suitability for reuse in irrigation. Over a year period starting April 2009, 94 water samples were collected from Omar Bek drain, Damietta branch upstream and downstream the drain as well as the drains discharging on Omar Bek. Based on physical, chemical and bacteriological results obtained, the water quality index analysis classified Omar Bek drain as poor drainage water, while Damietta branch upstream and downstream as good and marginal surface water respectively. It was also evident that El-Naseria drain is the major contributor to pollution levels in Omar Bek drain. Results were interpreted in terms of organic pollution from domestic sewage, agricultural runoff and fertilizers. Physical and chemical data compared to FAO guidelines showed a slight to moderate restriction on reusing water from Omar Bek drain for irrigation of susceptible crops, while no serious restrictions were concluded regarding water from Damietta branch. However, fecal coliform bacteria recorded and compared to WHO guidelines expected possible health hazards from pathogens in case of irrigating crops eaten raw or uncooked. The study recommended treating domestic wastewater and directing it to locations distant from direct disposal in Damietta branch and pointed out its possible reuse in cultivating cereal, industrial and fodder crops of economical importance.

The present study was carried out to evaluate the quality of Nile Tilapia fish "Oreochromis ... more The present study was carried out to evaluate the quality of Nile Tilapia fish "Oreochromis niloticus" collected from three main localities (Adendan, Abou Simbel and Toushka) in Lake Nasser, Egypt. Throughout four season's survey (2010 - 2011), 36 water samples and 60 fish samples were assayed. The Physicochemical and bacteriological parameters in the lake water were found within permissible limits. The macroscopical examination of collected fish samples confirmed their freshness, with no detected signs of clinical abnormalities. However, 23 fishes (38.3%) out of 60 were found positive for helminth parasites. The positive hosts were infected with nematodes (71.2%) and trematodes (28.8%) in the larval stage, whose incidence was restricted to the gills only and didn't exceed 1 - 6 larvae/fish. The infection was always single and not mixed and included the genera Amplicaecum, Contracaecum and Clinostomum. The total number of parasite individuals exhibited clear season...

Water Science

Tailoring highly efficient adsorbents for environmental remediation is a great challenge key. Thi... more Tailoring highly efficient adsorbents for environmental remediation is a great challenge key. This paper reports the synthesis of nanostructured pure hydroxylapatite and hydroxyapatite coupled with copper ferrite CuFe 2 O 4 @HAp by simple routes for utilizing in the capture of some heavy metal ions like Fe(II) and Al(III) ions. The prepared CuFe 2 O 4 @HAp has the advantage of the feasible removal of the adsorbent materials after the treatment process by just exposing them to an external magnetic field. The obtained adsorbent has been characterized by several techniques; XRD patterns showed the high purity of the materials. Moreover, the morphological study by TEM revealed the size of the nanoparticles with a needlelike shape that had a length of 21.9 to 44.04 nm and a cross-sectional dimension of 7.15 to 7.83 nm. Factors like contact time, pH, and the initial concentration have been investigated. Furthermore, different isothermic and kinetic models have been also simulated to study the adsorption performance of CuFe 2 O 4 @HAp. The obtained results revealed that this adsorbent could be a promising, safe, and sustainable inexpensive material for the wastewater treatment processes.

Environmental Science and Pollution Research

In aquacultures, heavy metals could be accumulated in fish tissues from natural and human-related... more In aquacultures, heavy metals could be accumulated in fish tissues from natural and human-related sources depending on different factors. This study aims to estimate the level of bioaccumulation of heavy metals in cultured Gilt-head sea bream Sparusaurata . In this regard, heavy metals concentrations were measured in both water and fish musculature that were collected from a private fish farm in Kafr ElSheikh, Egypt. Regarding the water samples, heavy metals were within the permissible limits with exception of Cd, Cu, and Zn. In fish musculature, all heavy metals were within the WHO/FAO permissible limits. The bioaccumulation factor (BAF) indicated that mostly all heavy metals accumulation in the Gilt-head sea bream musculature decreased with time which may be correlated with the increase in water pH, calcium, and other cations concentrations. The hazard index (HI) calculations indicate no adverse health effects of heavy metals on humans through daily fish consumption so far. However, health risks are not negligible making the regular monitoring of metal contaminants in the studied area a necessity.

Environmental Monitoring and Assessment

Three-dimensional mesoporous CeO2 hollow sphere (M-CeO2-HS) modified glassy carbon electrode (M-C... more Three-dimensional mesoporous CeO2 hollow sphere (M-CeO2-HS) modified glassy carbon electrode (M-CeO2-HS/GCE) was developed in this study as a very sensitive voltammetric sensor for detection of terazosin. This produced modifier was characterized by techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). There was a remarkable improvement in the electrochemical behavior relative to terazosin electro-oxidation on M-CeO2-HS/GCE surface, compared to bare GCE, in the optimized conditions of supporting electrolyte pH and casted modifier concentration. An oxidation peak was found for terazosin on modified electrode surface at the potential of about 0.57 V in phosphate buffer solution (pH=7.0). The linear dynamic range was 0.01 to 600.0 µM and the limit of detection was 1.9 nM with the aid of anodic peak of terazosin. Some advantages were reported for the modified electrode, including satisfactory reproducibility towa...

Environmental Technology & Innovation, 2022

This study investigates the water quality of El-Salam Canal with the objective of reconnoitering ... more This study investigates the water quality of El-Salam Canal with the objective of reconnoitering the possibility of implementing it for irrigation purposes. Water samples were collected from eight sites during the Over the period (Feb.- Sept. 2010). The samples were analyzed chemically and the obtained values were compared to the Food and Agricultural Organization (FAO), Water Environment Federation (WEF) and the World Health Organization (WHO). It was found that the water is capable to be used for irrigation purposes in the light of the pH, COD, BOD and heavy metals values but the values of EC, TDS, alkalinity, Na, Cl and fecal coliform might moderately restrict its implementation. It was concluded that receiving the water from Bahr Hadous drain with its inorganic salts and organic loads (i.e. due to the disposal of sewage, urban and agricultural runoff as well as industrial wastewater), increases the concentration of most of measured parameters of El-Salam Canal. The study, thus, ...

Human and Ecological Risk Assessment: An International Journal, 2019

Abstract In many arid and semi-arid regions, farmers are often obligated to informally use raw wa... more Abstract In many arid and semi-arid regions, farmers are often obligated to informally use raw wastewater for irrigating their crops. The impacts of wastewater irrigation on soil, crops, and human health were investigated, regarding trace metals and bacteria. Cr, Cu, Fe, Ni, and Zn were detected in wastewater. Cr, Cu, and Zn accumulated in soil and crops in the order rocket > clover > cabbage. The Health Risk Index reported risk from Cr and Zn in rocket. Fecal coliforms in wastewater and crops were detected along with Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa. The frequency (%) was 86.7% (cabbage), 66.7% (rocket), and 43.3% (clover). The multiple antibiotic resistance index (0.503) rendered crops high risk source for contamination. The comprehensive pollution index classified wastewater severely polluted (≥2.01). Conclusions deduced crops alternative reservoirs for trace metals and human pathogens. Recommendations included implementation of low cost treatment methods, holding irrigation 5–15 days before harvest, assuming citric and acetic acids reducing solutions for trace metals, and suggested ofloxacin, amoxycillin/clavulanate, and amikacin antibiotics against reported bacteria.

Water Science, 2016

It is with great appreciation that we acknowledge the following reviewers who have served our res... more It is with great appreciation that we acknowledge the following reviewers who have served our research community by reviewing manuscripts for Nutrients in 2011.

Regression analysis of water-quality data collected in 2004-06 was used to estimate concentration... more Regression analysis of water-quality data collected in 2004-06 was used to estimate concentrations for total nitrogen, ammonia, sodium, chloride, calcium, and biochemical oxygen demand. The explanatory variables examined for regression relations were monthly monitored properties of water-nitrate, electrical conductivity, chloride and chemical oxygen demand. For the conditions observed in 2004-06, nitrate was a significant explanatory variable for total nitrogen and ammonia estimated constituents, electrical conductivity was a significant explanatory variable for sodium and chloride estimated constituents, chloride was a significant explanatory variable for calcium estimated constituents, while chemical oxygen demand was a significant explanatory variable for biochemical oxygen demand estimated constituents. Water temperature pH, and dissolved oxygen were not statistically significant explanatory variables for any of the constituents in this study. The regression equations were evaluated using common measures of variability, including R2, or the proportion of variability in the estimated constituent explained by the regression equation. R2 values ranged from 68.0% for calcium concentration to 98.2% for total nitrogen concentration. By applying the developed regression equations on the fourth year of data collection 2007 to calculate the estimated concentrations and errors associated with these concentrations and calculating the median relative difference percentage (RDP) between measured constituent concentration and the constituent concentration estimated by the regression equations, the RPD values ranged from 0.82 for total nitrogen to 21.59 for chloride.

The physical and chemical properties and microbiological constituents of wastewater are important... more The physical and chemical properties and microbiological constituents of wastewater are important parameters in the design and operation of collection, treatment and use of treated effluent. Reuse of reclaimed wastewater may adversely affect public health and the environment of particular concern is degree of purification but also the selection of the most appropriate methods of irrigation and the water use efficiency by which wastewater is applied at the farmers level irrigation method and scheduling of irrigation are important components in the overall system for efficient and safe use of the reclaimed wastewater on environmentally sound bases. (Asano et al, 1984) Irrigation with wastewater has been extensively practiced with traditional irrigation methods over the centuries. Some of these methods are still used, but recently modern irrigation technology has been developed and widely accepted. This new technology, although very useful with all irrigation waters, might be of partic...

This study classifies Omar Bek drain water quality; its impact on Damietta branch and evaluates i... more This study classifies Omar Bek drain water quality; its impact on Damietta branch and evaluates its suitability for reuse in irrigation. Over a year period starting April 2009, 94 water samples were collected from Omar Bek drain, Damietta branch upstream and downstream the drain as well as the drains discharging on Omar Bek. Based on physical, chemical and bacteriological results obtained, the water quality index analysis classified Omar Bek drain as poor drainage water, while Damietta branch upstream and downstream as good and marginal surface water respectively. It was also evident that El-Naseria drain is the major contributor to pollution levels in Omar Bek drain. Results were interpreted in terms of organic pollution from domestic sewage, agricultural runoff and fertilizers. Physical and chemical data compared to FAO guidelines showed a slight to moderate restriction on reusing water from Omar Bek drain for irrigation of susceptible crops, while no serious restrictions were concluded regarding water from Damietta branch. However, fecal coliform bacteria recorded and compared to WHO guidelines expected possible health hazards from pathogens in case of irrigating crops eaten raw or uncooked. The study recommended treating domestic wastewater and directing it to locations distant from direct disposal in Damietta branch and pointed out its possible reuse in cultivating cereal, industrial and fodder crops of economical importance.

The present study was carried out to evaluate the quality of Nile Tilapia fish "Oreochromis ... more The present study was carried out to evaluate the quality of Nile Tilapia fish "Oreochromis niloticus" collected from three main localities (Adendan, Abou Simbel and Toushka) in Lake Nasser, Egypt. Throughout four season's survey (2010 - 2011), 36 water samples and 60 fish samples were assayed. The Physicochemical and bacteriological parameters in the lake water were found within permissible limits. The macroscopical examination of collected fish samples confirmed their freshness, with no detected signs of clinical abnormalities. However, 23 fishes (38.3%) out of 60 were found positive for helminth parasites. The positive hosts were infected with nematodes (71.2%) and trematodes (28.8%) in the larval stage, whose incidence was restricted to the gills only and didn't exceed 1 - 6 larvae/fish. The infection was always single and not mixed and included the genera Amplicaecum, Contracaecum and Clinostomum. The total number of parasite individuals exhibited clear season...

Water Science

Tailoring highly efficient adsorbents for environmental remediation is a great challenge key. Thi... more Tailoring highly efficient adsorbents for environmental remediation is a great challenge key. This paper reports the synthesis of nanostructured pure hydroxylapatite and hydroxyapatite coupled with copper ferrite CuFe 2 O 4 @HAp by simple routes for utilizing in the capture of some heavy metal ions like Fe(II) and Al(III) ions. The prepared CuFe 2 O 4 @HAp has the advantage of the feasible removal of the adsorbent materials after the treatment process by just exposing them to an external magnetic field. The obtained adsorbent has been characterized by several techniques; XRD patterns showed the high purity of the materials. Moreover, the morphological study by TEM revealed the size of the nanoparticles with a needlelike shape that had a length of 21.9 to 44.04 nm and a cross-sectional dimension of 7.15 to 7.83 nm. Factors like contact time, pH, and the initial concentration have been investigated. Furthermore, different isothermic and kinetic models have been also simulated to study the adsorption performance of CuFe 2 O 4 @HAp. The obtained results revealed that this adsorbent could be a promising, safe, and sustainable inexpensive material for the wastewater treatment processes.

Environmental Science and Pollution Research

In aquacultures, heavy metals could be accumulated in fish tissues from natural and human-related... more In aquacultures, heavy metals could be accumulated in fish tissues from natural and human-related sources depending on different factors. This study aims to estimate the level of bioaccumulation of heavy metals in cultured Gilt-head sea bream Sparusaurata . In this regard, heavy metals concentrations were measured in both water and fish musculature that were collected from a private fish farm in Kafr ElSheikh, Egypt. Regarding the water samples, heavy metals were within the permissible limits with exception of Cd, Cu, and Zn. In fish musculature, all heavy metals were within the WHO/FAO permissible limits. The bioaccumulation factor (BAF) indicated that mostly all heavy metals accumulation in the Gilt-head sea bream musculature decreased with time which may be correlated with the increase in water pH, calcium, and other cations concentrations. The hazard index (HI) calculations indicate no adverse health effects of heavy metals on humans through daily fish consumption so far. However, health risks are not negligible making the regular monitoring of metal contaminants in the studied area a necessity.

Environmental Monitoring and Assessment