Exposure of children to heavy metals from artisanal gold mining in Nigeria:evidences from bio-monitoring of hairs and nails  

作　　者：Adeniyi JohnPaul Adewumi Temitope Ayodeji Laniyan Tangfu Xiao Yizhang Liu Zengping Ning 

机构地区：[1]Department of Geological Sciences,Achievers University,Owo.Ondo State,Nigeria [2]Department of Environmental Health Sciences,College of Medicine,University of Ibadan,Ibadan,Oyo State,Nigeria [3]Key Laboratory for Water Quality and Conservation of the Pearl River Delta,Ministry of Education,Guangzhou University,Guangzhou 510006,China [4]School of Environmental Science and Engineering.Guangzhou University,Guangzhou 510006,China [5]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China

出　　处：《Acta Geochimica》2020年第4期451-470,共20页地球化学学报（英文）

基　　金：sponspored by research opening fund of State Key Laboratory of Environmental Geochemistry,Guiyang,Guizhou Province,China with grant No.SKLEG2017910。

摘　　要：In recent times,there had been reported cases of Pb poisoning in Anka gold mining area,Northwest Nigeria.Therefore,this study was carried out to determine the extent of bioaccumulation of heavy metals in the hairs and nails of children in the area.Forty samples(twenty nails and twenty hairs)samples were collected from ten boys and ten girls of ages 5–9 residing in the area.To ascertain the sources of heavy metals in children,15 soils samples,15 groundwater samples,5 samples of mine tailings,and 5 plants samples were collected.Hair and nails of the subjects were collected using internationally acceptable techniques.All samples were kept in uncontaminated ziplock bags prior to laboratory preparation and analysis.The samples were cleaned using nonionic detergent(triton X-100)and deionized water.The hairs and nails were digested with 10 mL of 6:1 mixture of nitric acid and perchloric acid.The soils,mine tailings,and plants were air-dried at room temperature,sieved,and chemically digested using the aqua regia method.The concentrations of metals in all the samples were determined using highperformance liquid chromatography–inductively coupled plasma–mass spectrometry.Statistical analysis was employed to unravel potential sources of metals in the media.Results showed that heavy metals in children of the area are above results from similar studies and pathological ranges for heavy metals in hairs and nails.Also,heavy metals in environmental media are above the recommended standards.Multivariate analysis showed that the metals are mainly from mining and other anthropogenic sources.Results of correlation between heavy metals in hairs and nails with those in geological samples revealed that heavy metal that bioaccumulates in the children of this area are mostly from contaminated environmental media.It is recommended that complete remediation and effective health education be carried out in the area.

关 键 词：Anka BIOACCUMULATION CHILDREN Heavy-metals HAIRS NAILS 

分 类 号：R725.9[医药卫生—儿科]