Browsing by Author "Frimpong, S.K."
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Item Efficient method development for atrazine determination in soil samples(E c o t o x i c o l o g y, 2013) Frimpong, S.K.; Gbeddy, G.; .Asamoah, C.O.; et al.Atrazine is a worldwide herbicide used to control pre- and post-emergence broadleaf and grassy weeds in major crops. Being both effective and inexpensive, it is well-suited to production systems with very narrow profit margins, asis often the case with maize. However, due to atrazineís ground water contamination potential and its association with birth defects and menstrual problems when consumed by humans at concentrations even below governmentstandards; environmental media monitoring for atrazine are inevitable. The objective of this study was to investigate a proposed ìsafe, cheap and relatively fastî analytical technique for the routine monitoring of atrazine in soil samples by high performance liquid chromatography equipped with ultra-violet detector and/or gas chromatography mass spectrometry. The method uses acetonitrile as the extracting solvent, and a self-packed activated silica gel for clean-up of extract. The proposed method exhibited good sensitivity and recovery, and allowed for rapid analysis. For soil analysis, a single chemist could prepare test solutions from 15 corresponding homogenized samples within 4 hours.Item Efficient method developmentfor atrazine determination in soilsamples(Environmental Science: An Indian Journal, 2013) Frimpong, S.K.; Gbeddy, G.; Asamoah, C.O.; et al.Atrazine is a worldwide herbicide used to control pre- and post-emergence broadleaf and grassy weeds in major crops. Being both effective and inexpensive, it is well-suited to production systems with very narrow profit margins, asis often the case with maize. However, due to atrazineís ground water contamination potential and its association with birth defects and menstrual problems when consumed by humans at concentrations even below governmentstandards; environmental media monitoring for atrazine are inevitable. The objective of this study was to investigate a proposed ìsafe, cheap and relatively fastî analytical technique for the routine monitoring of atrazine in soil samples by high performance liquid chromatography equipped with ultra-violet detector and/or gas chromatography mass spectrometry. The method uses acetonitrile as the extracting solvent, and a self-packed activated silica gel for clean-up of extract. The proposed method exhibited good sensitivity and recovery, and allowed for rapid analysis. For soil analysis, a single chemist could prepare test solutions from 15 corresponding homogenized samples within 4 hoursItem Levels and human health risk assessment of heavy metals in surface soil of public parks in Southern Ghana.(Environmental Monitoring and Assessment, 2019-08-23) Koranteng, S.S.; Frimpong, S.K.This study evaluates the extent to which humans may be exposed to health risk from heavy metals in surface soils of public parks in Southern Ghana during outdoor activities. The study investigated surface soils of 56 public parks from seven metropolitan cities in Southern Ghana. Heavy metals (Cd, Cr, Cu, Hg, Mn, Ni, Pb, and Zn) were determined using microwave-assisted HNO3-HF acid digestion and atomic absorption spectroscopy with flame, graphite furnace, and cold vapor options. All parks studied registered the presence of heavy metals with mean concentrations following the order: Mn > Zn > Cr > Pb > Cu > Ni > Cd > Hg. Whereas the mean concentrations of Zn (221.92 mg/kg) and Cr (107.01 mg/kg) respectively exceeded the Canadian (200 mg/kg; 64 mg/kg) and the EU (100-200 mg/kg; 50-100 mg/kg) standards, the ranges of Cu (14.27-138.85 mg/kg) and Pb (6.46-628.31 mg/kg) also exceeded their EU range of 50-100 mg/kg. The results indicated that there was no immediate risk to Ni and Hg on the public parks studied; however, Pb, Cd, Zn, Cu, and Cr may pose some adverse effects as they exceed their respective guideline limits in soil. The ranges of non-carcinogenic risk for adults and children were 0.0186-0.0787 and 0.0197-0.0850 respectively while the corresponding ranges for carcinogenic risks were 3.75 × 10-7-1.28 × 10-6 and 4.17 × 10-7-1.31 × 10-6. Even though risk assessment suggested low and acceptable health risk levels to patrons, there is the need for close monitoring since Pb, Cd, Zn, Cu, and Cr have shown tendency of accumulating beyond acceptable limit.