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Evaluation of the potential risks of heavy metal contamination in rice paddy soils around an abandoned Hg mine area in Southwest China

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Acta Geochimica 2020年第1期39卷 85-95页

作者： Bayou Adlane Zhidong Xu Xiaohang Xu Longchao Liang Jialiang Han Guangle Qiu State Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China College of Resources and Environmental Engineering.Guizhou University Guiyang 550003China

To assess the potential ecological and health risks of trace elements(Hg,Cd,As,Mn,Sb,Pb,Cu,Ni,Cr,and Zn),a total of 138 soil samples from rice paddies were collected during the rice harvest season in the Wanshan mining area,Guizhou Province,Southwest *** of the pollution load index(PLI),geo-accumulation index(I-Geo),enrichment factor(EF),and risk index(RI)were *** concentrations of Hg,Sb,As,Zn,Cd,Cu,and Mn were observed in the *** PLI,I-Geo,and EF results all showed high levels of contamination by Hg and Sb and moderate levels of contamination by As,Pb,Zn,Cu,Cd,and *** was no significant contamination from Ni and *** RI was very high,with Hg as the dominant pollutant,as expected,indicating that the historical large-scale Hg mining,as well as artisanal mining,has had a significant impact on the Wanshan ***,coal combustion,manganese factories,and the use of agrochemicals by the local population could also have an impact on the soil through the introduction of heavy metal *** address the current state of contamination,pollutant remediation and the regulation control of the anthropogenic activities in Wanshan are urgently needed.

关键词： Heavy metals ecological risk index Wanshan Hg mining area

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Correlation assessment and monitoring of the potential pollutants in the surface sediments of Pyeongchang River,Korea

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International Journal of Sediment Research 2011年第2期26卷 152-162页

作者： Md.Imran KABIR Hosik LEE Geonha KIM Taesung JUN Environmental Water Quality Lab Department of Environmental EngineeringChungju National University Department of Environmental Engineering Chungju National University Department of Civil and Environmental Engineering Hannam University

The study provides a baseline for the assessment of the organic and inorganic pollution specially, heavy metal contamination in the surface sediments of Pyeongchang River,South *** assessment of the study areas was done with respect to metal pollution load,ecological risk and geoaccumulated *** upon the used indices,a priority index(P) was used to rank the utmost contaminated *** the concentrations of mercury in all sediments were below the guideline, the significant enriched contamination was observed by all applied *** expected,the values of pollution load index(PLI),ecological risk index(RI) and geoaccumulation risk index(I) demonstrated lower heavy metal contamination in upstream areas compared to the downstream. Admittedly,sediments were unpolluted to slightly-polluted according to PLI while high to extremely high ecological risks were observed in several sediment ***,all the samples were uncontaminated as per *** simplification of I,the P,showed the utmost contaminated sediments with a value of ***,protective measures should be taken to the highly contaminated areas which are prioritized by PAdmittedly,the maximum concentrations of total organic carbon,total nitrogen,inorganic nitrogen,total phosphorous,inorganic phosphorous,calcium, magnesium,sodium and potassium were significantly observed as 7.8×10~4,3,185,36,1,032,3.7, 1,5163,2,881,669 and 4,076mg/kg accordingly.

关键词： Heavy metals Sediments Pollution load index ecological risk index Simplified geoaccumulation risk index Priority index

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Contamination and Potential risks of Heavy Metals in the Sediments of the Chari and Logon Rivers in N’Djamena, Chad

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Open Journal of Soil Science 2023年第2期13卷 29-45页

作者： Tchoroun Massang Digué Domga Tinda Noumi Guy Bertrand Madjitoloum Betoloum Salomon Dangwang Jean-Marie Dikdim Tarkodjiel Mianpereum Department of Chemistry Faculty of Exact and Applied Sciences University of N’Djamena N’Djamena Chad Department of Chemistry Faculty of Sciences University of Ngaoundere Ngaoundere Cameroon

The pollution of sediments by inorganic pollutants requires particularly important attention because of their toxicity, their persistence in the environment and their bioaccumulation by animal and plant life. The pollution of sediments by inorganic pollutants requires particularly important attention because of their toxicity, their persistence in the environment and their bioaccumulation by animal and plant living beings. This study focuses on the pollution of sediments of the Chari and Logon rivers in the city of N’Djamena by heavy metals. The objective of this study is to evaluate the degree of contamination, the geo-accumulation index and the degree of the Pollutant Loading index of some heavy metals (Pb, Cr, Cu, Mn and Cd) and iron in the sediments of the sampled sites. The average concentrations of heavy metals and iron in the sediments are: Pb (10.00 ± 00 μg/Kg to 126 ± 16.52 μg/Kg);Cr VI (0.13 ± 00 mg/Kg to 0.21 ± 00 mg/Kg);Cd (trace);Cu (0.08 ± 0.02 mg/kg to 3.23 ± 0.64 mg/kg);Fe (0.25 ± 0.00 mg/kg to 5.79 ± 0.00 mg/kg);and Mn (0.2 ± 0.00 mg/Kg to 1.1 ± 0.00 mg/Kg);in order of highest to lowest abundance: Fe > Mn > Cd > Cu > Cr VI > Pb for the Logon;Fe > Cu > Mn > Cd > Cr VI > Pb for the Chari and Fe > Mn > Cu > Cd > Cr VI > Pb for the Confluent. The contamination factors for all heavy metals range from no contamination to low contamination for the sediments analyzed. The geo-accumulation indices indicate that the sampled sites are not polluted. The same is true for Er and RI which confirm an absence of ecological risks in the analyzed sediments.

关键词： Heavy Metals Contamination Factor Geo-Accumulation index ecological risk index Chari and Logone Rivers in Chad

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