Assessment of trace metals contamination in stream sediments and soils in Abuja leather mining, southwestern Nigeria  

作　　者：Abiola Oyebamiji Adegbola Odebunmi Hu Ruizhong Atta Rasool 

机构地区：[1]State Key Laboratory of Ore Deposit Geochemistry, Instituteof Geochemistry, Chinese Academy of Sciences,Guiyang 550081, China [2]Department of Geological Services, Ogun State Ministry of Commerce and Industry, Oke-Mosan, Abeokuta, Nigeria [3]University of Chinese Academy of Sciences, Beijing 100049,China [4]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry, Chinese Academy of Sciences,Guiyang 550081, China [5]Department of Science Laboratory Technology, Ekiti StateUniversity, Ado-Ekiti, Ekiti State, Nigeria

出　　处：《Acta Geochimica》2018年第4期592-613,共22页地球化学学报（英文）

基　　金：the Chinese Academy of Sciences and The World Academy of Sciences for sponsoring this research through the CAS-TWAS President’s Fellowship program

摘　　要：This study is aimed at determining the level of environmental degradation as well as the concentration of trace elements in soil and stream sediments in order to evaluate the environmental impact of the mining operation.Twenty-five(25) soils and ten(10) stream sediment samples were collected from the study area. The physicochemical parameters were determined using appropriate instrumentation with the aid of a digital p H meter(Milwaukee meter) to measure the p H and electrical conductivity, total dissolved solids, moisture content and loss on ignition of the soil and stream sediment samples. The p H of the soil sample ranged from(6.10 to 7.19); Electrical conductivity ranged from(21.3 to 279.4 μS/cm), moisture content varied from(0.60% to 7.20%), and the LOI ranged from(2.03% to 18.62%). The results of the analysis showed that the concentrations of the trace elements in the soils and stream sediment samples were slightly higher than the background values. Plots of the trace elements in stream sediment samples show moderate, consistent decrease downstream except at points where there was mine water discharge into the main river. The pollution levels of heavy metals were examined in stream sediment and soil samples using different assessable indices, such as the enrichment factor, which showed significant-moderate enrichment for Cr, Th, Nb, Zn, Pb, Y and Zr and the geoaccumulation index, which showed practically moderate contamination with Cr, Ni and Sr based on regional background reference values. Geo-accumulation index and contamination index for soils and stream sediment revealed uncontaminated to moderate contamination. Likewise,elements with moderate contamination were Cr, Ni and Sr.The Pearson correlation showed that there were significant positive associations among selected metals in soil and stream sediment samples.This study is aimed at determining the level of environmental degradation as well as the concentration of trace elements in soil and stream sediments in order to evaluate the environmental impact of the mining operation. Twenty-five （25） soils and ten （10） stream sediment sam- ples were collected from the study area. The physico- chemical parameters were determined using appropriate instrumentation with the aid of a digital pH meter （Mil- waukee meter） to measure the pH and electrical conduc- tivity, total dissolved solids, moisture content and loss on ignition of the soil and stream sediment samples. The pH of the soil sample ranged from （6.10 to 7.19）; Electrical conductivity ranged from （21.3 to 279.4 μS/cm）, moisture content varied from （0.60% to 7.20%）, and the LOI ranged from （2.03% to 18.62%）. The results of the analysis showed that the concentrations of the trace elements in the soils and stream sediment samples were slightly higher than the background values. Plots of the trace elements in stream sediment samples show moderate, consistent decrease downstream except at points where there was mine water discharge into the main river. The pollution levels of heavy metals were examined in stream sediment and soil samples using different assessable indices, such as the enrichment factor, which showed significant-moderate enrichment for Cr, Th, Nb, Zn, Pb, Y and Zr and the geo- accumulation index, which showed practically moderate contamination with Cr, Ni and Sr based on regional background reference values. Geo-accumulation index and contamination index for soils and stream sediment revealed uncontaminated to moderate contamination. Likewise, elements with moderate contamination were Cr, Ni and Sr. The Pearson correlation showed that there were significant positive associations among selected metals in soil and stream sediment samples.

关 键 词：Trace metals Stream sediments Geo-accumulation index - PCA Soil Southwestern Nigeria 

分 类 号：X53[环境科学与工程—环境工程] X825