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Awofolu OR 《Environmental monitoring and assessment》2005,105(1-3):431-447
The concentration of trace metals (Cd, Cu, Pb and Zn) in a total of 144 samples of grass, soil and lower animal (earthworm, Lybrodrilus violaceous) were collected and analysed for their metallic content. Levels of cadmium ranged from 0.01–0.07 g g–1; 0.01–0.12 g g–1 and from trace–0.05 g g–1 dry weight for plant, soil and animal samples respectively. Mean concentration of copper ranged 0.10–1.48 g g–1; 0.10–2.90 g g–1 and 0.01–0.08 g g–1 for samples in similar order as above. The levels of Pb varied from 0.01–0.14 g g–1; 0.02–0.23 g g–1 and from trace–0.07 g g–1 while that of Zn ranged from 0.19–1.80 g g–1; 0.51–3.35 g g–1and 0.01–0.08 g g–1 also in the same order of samples as mentioned above. Levels of metals in soil samples were higher than the background levels with the exception of Zn but lower than European Union (EU) limits. The results generally revealed the presence of metals in plant and animal samples and metal dynamics up the food chain is highly possible. Acceptable recoveries of the spiking experiment validate the experimental protocol. 相似文献
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Persistent organochlorine pesticides (OCPs) such as DDT and its metabolites (DDDs and DDEs). chlordane, hexachlorobenzene (HCB), heptachlor and endosulfan were determined in drinking-, ground-, surface- and marine waters from the Eastern Cape Province of South Africa. Percentage recoveries of the OCPs from spiked river water ranged from 71.03 +/- 8.15% (dieldrin) to 101.25 +/- 2.17% (alpha-BHC). The levels of OCPs ranged from 5.5 ng/L (2,4-DDD) to 160 ng/L (HCB) in the water samples. Some endocrine disrupting OCPs such as DDT, DDE, heptachlor, endosulfan and chlordane were detected. 相似文献
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Olumuyiwa O. Okedeyi Mathew M. Nindi Simiso Dube O. R. Awofolu 《Environmental monitoring and assessment》2013,185(3):2073-2082
The distribution and potential sources of 15 polycyclic aromatic hydrocarbons (PAHs) in soils in the vicinity of three South African coal-fired power plants were determined by gas chromatography–mass spectrometry. PAH compound ratios such as phenanthrene/phenanthrene + anthracene (Phen/Phen + Anth) were used to provide reliable estimation of emission sources. The total PAH concentration in the soils around three power plants ranged from 9.73 to 61.24 μg g?1, a range above the Agency for Toxic Substances and Disease Registry levels of 1.0 μg g?1 for significantly contaminated site. Calculated values of Phen/Phen + Anth ratio were 0.48?±?0.08, 0.44?±?0.05, and 0.38?+?0.04 for Matla, Lethabo, and Rooiwal, respectively. Flouranthene/fluoranthene + pyrene (Flan/Flan + Pyr) were found to be 0.49?±?0.03 for Matla, 0.44?±?0.05 for Lethabo, and 0.53?±?0.08 for Rooiwal. Such values indicate a pyrolytic source of PAHs. Higher molecular weight PAHs (five to six rings) were predominant, suggesting coal combustion sources. A good correlation existed between most of the PAHs implying that these compounds were emitted from similar sources. The carcinogenic potency B[a]P equivalent concentration (B[a] Peq) at the three power plants ranged from 3.61 to 25.25 indicating a high carcinogenic burden. The highest (B[a] Peq) was found in samples collected around Matla power station. It can therefore be concluded that the soils were contaminated with PAHs originating from coal-fired power stations. 相似文献
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Omotayo Rafiu Awofolu 《The Environmentalist》2006,26(4):285-293
Groundwater (well water) from a residential area within the vicinity of an industrial estate in Lagos, Nigeria were sampled
and analysed by Flame Atomic Absorption Spectroscopy for their heavy metals content. This was with a view of assessing the
quality of the water, which was being used for domestic activities, especially, drinking usually without treatment. Total
trace metal determination by mineral acid digestion of water samples was applied. This method proved to be better than an
extractive concentration technique in the quality assurance protocols with the recovery range being 90.7 ± 0.006–97.6 ± 0.003%.
Mean concentration of trace metals in water samples ranged from Fe: 0.05–0.47 mg l−1; Al: 0.1–1.54 mg l−1; Cu: 0.14–1.39 mg l−1; Zn: 0.04–0.43 mg l−1; Cd: trace–0.02 mg l−1; Pb: trace–0.03 mg l−1, Mn: 0.01–0.18 mg l−1 and Ni: 0.02–0.11 mg l−1. Physical parameters of water samples examined were within the drinking water safety limits except for conductivity. Results
generally indicate the presence of heavy metal constituents in groundwater samples. Detection of metals such as cadmium and
lead which have serious health implications above WHO and USEPA limits in drinking water gives cause for concern. 相似文献
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Assessing the enrichment of heavy metals in surface soil and plant (Digitaria eriantha) around coal-fired power plants in South Africa 总被引:1,自引:0,他引:1
Olumuyiwa O. Okedeyi Simiso Dube Omotayo R. Awofolu Mathew M. Nindi 《Environmental science and pollution research international》2014,21(6):4686-4696
Nine metals (Fe, Cu, Mn, Ni, Cd, Pb, Hg, Cr, and Zn) were determined in soil and Digitaria eriantha plants within the vicinity of three coal power plants (Matla, Lethabo, and Rooiwal), using ICP-OES and GFAAS. The total metal concentration in soil ranged from 0.05?±?0.02 to 1836?±?70 μg g?1, 0.08?±?0.05 to 1744?±?29 μg g?1, and 0.07?±?0.04 to 1735?±?91 μg g?1 in Matla, Lethabo, and Rooiwal, respectively. Total metal concentration in the plant (D. eriantha) ranged from 0.005?±?0.003 to 535?±?43 μg g?1 in Matla, 0.002?±?0.001 to 400?±?269 μg g?1 in Lethabo, and 0.002?±?0.001 to 4277?±?201 μg g?1 in Rooiwal. Accumulation factors (A) of less than 1 (i.e., 0.003 to 0.37) at all power plants indicate a low transfer of metal from soil to plant (excluder). Enrichment factor values obtained (2.4–5.0) indicate that the soils are moderately enriched with the exception of Pb that had significant enrichment of 20. Geo-accumulation index (I-geo) values of metals indicate that the soils are moderately polluted (0.005–0.65), except for Pb that showed moderate to strong pollution (1.74–2.53). 相似文献
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