Godfred Duodu - Academia.edu (original) (raw)

Papers by Godfred Duodu

Analytica Chimica Acta, Oct 1, 2015

Determination of refractive and volatile elements in sediment using laser ablation inductively co... more Determination of refractive and volatile elements in sediment using laser ablation inductively coupled plasma mass spectrometry.

Environmental Pollution, Aug 1, 2020

Microplastics pose threats to aquatic environments because they serve as hard-substrate for micro... more Microplastics pose threats to aquatic environments because they serve as hard-substrate for microbial community colonization and biofilm formation due to their long-life span and hydrophobic surface which can impact on aquatic ecosystems. However, the association between microplastics and other pollutants, particularly nutrients and metals in river sediments are largely unknown. In this study, microplastics abundance and hazard scores which are the risks arising from chemical compounds used for plastics manufacture, and the correlations between microplastics and the concentrations of total carbon (TC), total nitrogen (TN), total phosphorus (TP) and metals commonly present in the urban environment such as Al, As, Cr, Co, Cu, Fe, Mg, Mn, Ni, Cd, Se, Sr, Zn, Pb, in Brisbane River sediments were investigated. The study confirmed that the risk associated with microplastics is based on their monomer composition rather than the quantities present. Sediments having relatively higher abundance of microplastics with a relatively lower hazard score result in higher nutrient concentrations. The concentrations of metals in river sediments are more dependent on their original sources rather than the concentration of microplastics. Nevertheless, leachate from plastics should be considered in risk assessment in relation to the association between metals and plastics in aquatic environments.

Zn had the potential to occasionally cause biological effects while Hg could frequently cause bio... more Zn had the potential to occasionally cause biological effects while Hg could frequently cause biological effects. Potential ecological risk index (RI) revealed that the sediment poses moderate to considerable ecological risk. Consequently, a modified ecological risk index (MRI) employing enrichment factor is proposed. This provided a more reliable understanding of whole sediment behaviour and classified the ecological risk of the sediment as moderate to very high. In view of that, weak acid extraction method that mobilizes the loosely bound metals was used to assess bioavailability of the metals. The method considerably leached >30% of Ag, As, Ca, Cd, Co, Cu, Hg, Mn Ni, Pb and Zn from the sediment showing that these metals are significantly present in the bioavailable form and are of concern to aquatic species. Application of sediment quality indices and ecological indicators show that the sediment poses considerable to very high ecological risk. The use of PCA/APCS for source apportionment also identified three sources of bioavailable metals, namely: lithogenic source accounting for 72%, shipping related source contributing 15% and traffic related source representing 13% of the total load. v

Ecological Engineering, 2021

Abstract Land use management plays a key role in mitigating urban river pollution. Past research ... more Abstract Land use management plays a key role in mitigating urban river pollution. Past research has addressed how primary land uses influence river water and sediment quality, but has given limited attention to the subdivision of primary land uses to a secondary level, limiting the accurate identification of potential sources of pollutants. The current study, using Bayesian Networks, investigated how the hierarchical structure of land use can be employed to accurately characterise the pollution of sediments in two rivers in China and Australia. It was found that the primary land uses are a weak determinant of potential sources of metals, nutrients, and organochlorine pesticides (OCPs). However, secondary land uses provide higher accuracy in determining pollutant sources. The study highlighted that the lack of data to enable the subdivision of land uses can constrain informed decision making for the mitigation of urban water pollution.

Marine Pollution Bulletin, Apr 1, 2020

The detection rates of pharmaceuticals (Ps), personal care products (PCPs), current-use pesticide... more The detection rates of pharmaceuticals (Ps), personal care products (PCPs), current-use pesticides (CUPs) and a food additive (FA) in Brisbane River estuary (Queensland), Sydney estuary (New South Wales) and the Yarra River estuary (Melbourne, Victoria

Ecological Indicators, Feb 1, 2017

Highlights  The first comprehensive source apportionment of PAHs in Brisbane River sediments  D... more Highlights  The first comprehensive source apportionment of PAHs in Brisbane River sediments  Diagnostic ratios and receptor models were employed for source identification.  Dominant vehicular emission and moderate biomass contribution of PAHs identified  Mean effects range median quotients indicated low ecological risks to the river.  PAH exposure poses toxic non-cancer and cancer risks to humans especially children.

Environmental Pollution, Apr 1, 2017

The sediment environment provides habitat for fauna and flora. As pollutants can interchange betw... more The sediment environment provides habitat for fauna and flora. As pollutants can interchange between water and sediments, pollution will exert a significant influence on the water environment. Previous studies on polycyclic aromatic hydrocarbon (PAHs) pollution of sediments have primarily focused on the comparison of concentrations between seasons, land uses and species. Studies on the identification of the hierarchy of factors which influence PAHs distribution and its variability in river sediments are limited. This paper discusses a comprehensive investigation into the inherent variability of PAHs in sediments and the primary factors which influence this variability. The study outcomes confirmed that key factors exerting influence on PAH distribution in sediments can be ranked in the order: land use > population > seasons. Accordingly, intensive urban land use was identified as the most important factor influencing PAHs distribution. Additionally, it was found that with increasing urban development, PAHs concentrations and their variability in sediments increase in terms of the molecular weight of different species. The study outcomes are expected to enhance management strategies to mitigate PAHs pollution of urban water environments including the prioritisation of factors requiring management and the selection of appropriate approaches in the context of cost-effectiveness.

Talanta, Apr 1, 2016

Optimization of in-cell accelerated solvent extraction technique for the determination of organoc... more Optimization of in-cell accelerated solvent extraction technique for the determination of organochlorine pesticides in river sediments. Talanta, 150, pp. 278-285.

Environmental Pollution, Oct 1, 2017

Land use is an influential factor in river sediment pollution. However, land use type alone is fo... more Land use is an influential factor in river sediment pollution. However, land use type alone is found to be inadequate to explain pollutant contributions to the aquatic environment since configurations within the same land use type such as land cover and development layout could also exert an important influence. Consequently, this paper discusses a research study, which consisted of an in-depth investigation into the relationship between land use type and river sediment pollution by introducing robust parameters that represent configurations within the primary land use types. Urban water pollutants, namely, nutrients, total carbon, polycyclic aromatic hydrocarbons and metals were investigated in the study. The outcomes show that higher patch density and more diverse land use development forms contribute relatively greater pollutant loads to receiving waters and consequently leading to higher sediment pollution. The study outcomes are expected to contribute essential knowledge for creating robust management strategies to minimise waterway pollution and thereby protect the health of aquatic ecosystems.

Environmental Pollution, Dec 1, 2016

Estuarine environment is complex and receives different contaminants from numerous sources that a... more Estuarine environment is complex and receives different contaminants from numerous sources that are persistent, bioaccumulative and toxic. The distribution, source, contamination and ecological risk status of heavy metals in sediment of Brisbane River, Australia were investigated. Sediment samples were analysed for major and minor elements using LA-ICP-MS. Principal component analysis and cluster analysis identified three main sources of metals in the samples: marine sand intrusion, mixed lithogenic and sand intrusion as well as transport related. To overcome inherent deficiencies in using a single index, a range of sediment quality indices, including contamination factor, enrichment factor, index of geoaccumulation, modified degree of contamination, pollution index and modified pollution index were utilised to ascertain the sediment quality. Generally, the sediment is deemed to be slightly to heavily polluted. A further comparison with the Australian Sediment Quality Guidelines indicated that Ag, Cr, Cu, Ni, Pb and Zn had the potential to rarely cause biological effects while Hg could frequently cause biological effects. Application of potential ecological risk index (RI) revealed that the sediment poses moderate to considerable ecological risk. However, RI could not account for the complex sediment behaviour because it uses a simple contamination factor. Consequently, a modified ecological risk index (MRI) employing enrichment factor is proposed. This provides a more reliable understanding of whole sediment behaviour and classified the ecological risk of the sediment as moderate to very high. The results demonstrate the need for further investigation into heavy metal speciation and bioavailability in the sediment to ascertain the degree of toxicity. Capsule A modified ecological risk index is proposed based on in-depth investigation of Brisbane River sediment

Science of The Total Environment, Jan 15, 2023

Marine Pollution Bulletin, Apr 1, 2017

and Zn were leached from the sediment showing that these metals are significantly present in the ... more and Zn were leached from the sediment showing that these metals are significantly present in the bioavailable form. PCA/APCS identified three sources of the metals, namely: lithogenic accounting for 72%, shipping related contributing 15% and traffic related representing 13% of the total load. Application of pollution index (PI) and modified pollution index (MPI) revealed that the sediment range from unpolluted to heavily polluted while ecological risk index (RI) classifies the sediment as posing low ecological risk modified ecological risk index (MRI) suggests considerable to very high ecological risk. To provide holistic insights into the ecological risks posed by metals, enrichment factor, MPI and MRI are recommended for the assessment of sediment in complex environments such as estuaries.

British journal of pharmacology and toxicology, Oct 25, 2011

Forty eight (48) hair pomade samples collected from female students at the University of Ghana ca... more Forty eight (48) hair pomade samples collected from female students at the University of Ghana campus were analysed for heavy metal content using atomic absorption spectrometry technique. The concentrations were compared with available data on internationally acceptable maximum limits for these elements and their possible health implications on the consumering public. Eleven (11) heavy metals were considered including Ca, Co, Cr, Cu, Fe, Mg, Mn, Ni and Zn (essential mineral nutrients) as well as Cd and Pb (toxic elements). All the samples recorded significant levels for most of the elements of interest except Cr concentrations which were below detection (<0.001 mg/kg) for each of the samples analysed. The mean and standard deviation concentrations for the elements in mg/kg are as follows: Ca (421.055±180.203), Co (16.036±5.479), Cu (3.758±2.270), Fe (209.866±67.531), Mg (19.830±24.310), Mn (9.800±2.423) and Zn (17.547±18.876), Cd (5.697±0.967), Ni (11.274±10.502) and Pb (8.269±4.864). Significantly some of the essential trace elements such as Co, Fe, Mn and Ni in the samples were quite high and exceeded reference levels in hair of healthy individuals from different countries, while the remaining elements were within the range. Also the Cd and Pb content of the samples were above the permissible limits for heavy metals in cosmetic products. There is therefore the need for immediate and regular mandatory testing of imported and local cosmetic products specifically hair pomades into the Ghanaian market by the appropriate regulatory authority to prevent the associated health risk and ensure consumer safety.

Science of The Total Environment

Applied Radiation and Isotopes, 2012

A feasibility study for (131)I production using a Low Power Research Reactor was conducted to pre... more A feasibility study for (131)I production using a Low Power Research Reactor was conducted to predict the yield of (131)I by cyclic activation technique. A maximum activity of 5.1GBq was achieved through simulation using FORTRAN 90, for an irradiation of 6h. But experimentally only 4h irradiation could be done, which resulted in an activity of 4.0×10(5)Bq. The discrepancy in the activities was due to the fact that beta decays released during the process could not be considered.

Marine Pollution Bulletin

Analytica Chimica Acta, Oct 1, 2015

Determination of refractive and volatile elements in sediment using laser ablation inductively co... more Determination of refractive and volatile elements in sediment using laser ablation inductively coupled plasma mass spectrometry.

Environmental Pollution, Aug 1, 2020

Microplastics pose threats to aquatic environments because they serve as hard-substrate for micro... more Microplastics pose threats to aquatic environments because they serve as hard-substrate for microbial community colonization and biofilm formation due to their long-life span and hydrophobic surface which can impact on aquatic ecosystems. However, the association between microplastics and other pollutants, particularly nutrients and metals in river sediments are largely unknown. In this study, microplastics abundance and hazard scores which are the risks arising from chemical compounds used for plastics manufacture, and the correlations between microplastics and the concentrations of total carbon (TC), total nitrogen (TN), total phosphorus (TP) and metals commonly present in the urban environment such as Al, As, Cr, Co, Cu, Fe, Mg, Mn, Ni, Cd, Se, Sr, Zn, Pb, in Brisbane River sediments were investigated. The study confirmed that the risk associated with microplastics is based on their monomer composition rather than the quantities present. Sediments having relatively higher abundance of microplastics with a relatively lower hazard score result in higher nutrient concentrations. The concentrations of metals in river sediments are more dependent on their original sources rather than the concentration of microplastics. Nevertheless, leachate from plastics should be considered in risk assessment in relation to the association between metals and plastics in aquatic environments.

Zn had the potential to occasionally cause biological effects while Hg could frequently cause bio... more Zn had the potential to occasionally cause biological effects while Hg could frequently cause biological effects. Potential ecological risk index (RI) revealed that the sediment poses moderate to considerable ecological risk. Consequently, a modified ecological risk index (MRI) employing enrichment factor is proposed. This provided a more reliable understanding of whole sediment behaviour and classified the ecological risk of the sediment as moderate to very high. In view of that, weak acid extraction method that mobilizes the loosely bound metals was used to assess bioavailability of the metals. The method considerably leached >30% of Ag, As, Ca, Cd, Co, Cu, Hg, Mn Ni, Pb and Zn from the sediment showing that these metals are significantly present in the bioavailable form and are of concern to aquatic species. Application of sediment quality indices and ecological indicators show that the sediment poses considerable to very high ecological risk. The use of PCA/APCS for source apportionment also identified three sources of bioavailable metals, namely: lithogenic source accounting for 72%, shipping related source contributing 15% and traffic related source representing 13% of the total load. v

Ecological Engineering, 2021

Abstract Land use management plays a key role in mitigating urban river pollution. Past research ... more Abstract Land use management plays a key role in mitigating urban river pollution. Past research has addressed how primary land uses influence river water and sediment quality, but has given limited attention to the subdivision of primary land uses to a secondary level, limiting the accurate identification of potential sources of pollutants. The current study, using Bayesian Networks, investigated how the hierarchical structure of land use can be employed to accurately characterise the pollution of sediments in two rivers in China and Australia. It was found that the primary land uses are a weak determinant of potential sources of metals, nutrients, and organochlorine pesticides (OCPs). However, secondary land uses provide higher accuracy in determining pollutant sources. The study highlighted that the lack of data to enable the subdivision of land uses can constrain informed decision making for the mitigation of urban water pollution.

Marine Pollution Bulletin, Apr 1, 2020

The detection rates of pharmaceuticals (Ps), personal care products (PCPs), current-use pesticide... more The detection rates of pharmaceuticals (Ps), personal care products (PCPs), current-use pesticides (CUPs) and a food additive (FA) in Brisbane River estuary (Queensland), Sydney estuary (New South Wales) and the Yarra River estuary (Melbourne, Victoria

Ecological Indicators, Feb 1, 2017

Highlights  The first comprehensive source apportionment of PAHs in Brisbane River sediments  D... more Highlights  The first comprehensive source apportionment of PAHs in Brisbane River sediments  Diagnostic ratios and receptor models were employed for source identification.  Dominant vehicular emission and moderate biomass contribution of PAHs identified  Mean effects range median quotients indicated low ecological risks to the river.  PAH exposure poses toxic non-cancer and cancer risks to humans especially children.

Environmental Pollution, Apr 1, 2017

The sediment environment provides habitat for fauna and flora. As pollutants can interchange betw... more The sediment environment provides habitat for fauna and flora. As pollutants can interchange between water and sediments, pollution will exert a significant influence on the water environment. Previous studies on polycyclic aromatic hydrocarbon (PAHs) pollution of sediments have primarily focused on the comparison of concentrations between seasons, land uses and species. Studies on the identification of the hierarchy of factors which influence PAHs distribution and its variability in river sediments are limited. This paper discusses a comprehensive investigation into the inherent variability of PAHs in sediments and the primary factors which influence this variability. The study outcomes confirmed that key factors exerting influence on PAH distribution in sediments can be ranked in the order: land use > population > seasons. Accordingly, intensive urban land use was identified as the most important factor influencing PAHs distribution. Additionally, it was found that with increasing urban development, PAHs concentrations and their variability in sediments increase in terms of the molecular weight of different species. The study outcomes are expected to enhance management strategies to mitigate PAHs pollution of urban water environments including the prioritisation of factors requiring management and the selection of appropriate approaches in the context of cost-effectiveness.

Talanta, Apr 1, 2016

Optimization of in-cell accelerated solvent extraction technique for the determination of organoc... more Optimization of in-cell accelerated solvent extraction technique for the determination of organochlorine pesticides in river sediments. Talanta, 150, pp. 278-285.

Environmental Pollution, Oct 1, 2017

Land use is an influential factor in river sediment pollution. However, land use type alone is fo... more Land use is an influential factor in river sediment pollution. However, land use type alone is found to be inadequate to explain pollutant contributions to the aquatic environment since configurations within the same land use type such as land cover and development layout could also exert an important influence. Consequently, this paper discusses a research study, which consisted of an in-depth investigation into the relationship between land use type and river sediment pollution by introducing robust parameters that represent configurations within the primary land use types. Urban water pollutants, namely, nutrients, total carbon, polycyclic aromatic hydrocarbons and metals were investigated in the study. The outcomes show that higher patch density and more diverse land use development forms contribute relatively greater pollutant loads to receiving waters and consequently leading to higher sediment pollution. The study outcomes are expected to contribute essential knowledge for creating robust management strategies to minimise waterway pollution and thereby protect the health of aquatic ecosystems.

Environmental Pollution, Dec 1, 2016

Estuarine environment is complex and receives different contaminants from numerous sources that a... more Estuarine environment is complex and receives different contaminants from numerous sources that are persistent, bioaccumulative and toxic. The distribution, source, contamination and ecological risk status of heavy metals in sediment of Brisbane River, Australia were investigated. Sediment samples were analysed for major and minor elements using LA-ICP-MS. Principal component analysis and cluster analysis identified three main sources of metals in the samples: marine sand intrusion, mixed lithogenic and sand intrusion as well as transport related. To overcome inherent deficiencies in using a single index, a range of sediment quality indices, including contamination factor, enrichment factor, index of geoaccumulation, modified degree of contamination, pollution index and modified pollution index were utilised to ascertain the sediment quality. Generally, the sediment is deemed to be slightly to heavily polluted. A further comparison with the Australian Sediment Quality Guidelines indicated that Ag, Cr, Cu, Ni, Pb and Zn had the potential to rarely cause biological effects while Hg could frequently cause biological effects. Application of potential ecological risk index (RI) revealed that the sediment poses moderate to considerable ecological risk. However, RI could not account for the complex sediment behaviour because it uses a simple contamination factor. Consequently, a modified ecological risk index (MRI) employing enrichment factor is proposed. This provides a more reliable understanding of whole sediment behaviour and classified the ecological risk of the sediment as moderate to very high. The results demonstrate the need for further investigation into heavy metal speciation and bioavailability in the sediment to ascertain the degree of toxicity. Capsule A modified ecological risk index is proposed based on in-depth investigation of Brisbane River sediment

Science of The Total Environment, Jan 15, 2023

Marine Pollution Bulletin, Apr 1, 2017

and Zn were leached from the sediment showing that these metals are significantly present in the ... more and Zn were leached from the sediment showing that these metals are significantly present in the bioavailable form. PCA/APCS identified three sources of the metals, namely: lithogenic accounting for 72%, shipping related contributing 15% and traffic related representing 13% of the total load. Application of pollution index (PI) and modified pollution index (MPI) revealed that the sediment range from unpolluted to heavily polluted while ecological risk index (RI) classifies the sediment as posing low ecological risk modified ecological risk index (MRI) suggests considerable to very high ecological risk. To provide holistic insights into the ecological risks posed by metals, enrichment factor, MPI and MRI are recommended for the assessment of sediment in complex environments such as estuaries.

British journal of pharmacology and toxicology, Oct 25, 2011

Forty eight (48) hair pomade samples collected from female students at the University of Ghana ca... more Forty eight (48) hair pomade samples collected from female students at the University of Ghana campus were analysed for heavy metal content using atomic absorption spectrometry technique. The concentrations were compared with available data on internationally acceptable maximum limits for these elements and their possible health implications on the consumering public. Eleven (11) heavy metals were considered including Ca, Co, Cr, Cu, Fe, Mg, Mn, Ni and Zn (essential mineral nutrients) as well as Cd and Pb (toxic elements). All the samples recorded significant levels for most of the elements of interest except Cr concentrations which were below detection (<0.001 mg/kg) for each of the samples analysed. The mean and standard deviation concentrations for the elements in mg/kg are as follows: Ca (421.055±180.203), Co (16.036±5.479), Cu (3.758±2.270), Fe (209.866±67.531), Mg (19.830±24.310), Mn (9.800±2.423) and Zn (17.547±18.876), Cd (5.697±0.967), Ni (11.274±10.502) and Pb (8.269±4.864). Significantly some of the essential trace elements such as Co, Fe, Mn and Ni in the samples were quite high and exceeded reference levels in hair of healthy individuals from different countries, while the remaining elements were within the range. Also the Cd and Pb content of the samples were above the permissible limits for heavy metals in cosmetic products. There is therefore the need for immediate and regular mandatory testing of imported and local cosmetic products specifically hair pomades into the Ghanaian market by the appropriate regulatory authority to prevent the associated health risk and ensure consumer safety.

Science of The Total Environment

Applied Radiation and Isotopes, 2012

A feasibility study for (131)I production using a Low Power Research Reactor was conducted to pre... more A feasibility study for (131)I production using a Low Power Research Reactor was conducted to predict the yield of (131)I by cyclic activation technique. A maximum activity of 5.1GBq was achieved through simulation using FORTRAN 90, for an irradiation of 6h. But experimentally only 4h irradiation could be done, which resulted in an activity of 4.0×10(5)Bq. The discrepancy in the activities was due to the fact that beta decays released during the process could not be considered.

Marine Pollution Bulletin