Heavy metal pollution in farmland irrigated with river water near a steel plant——magnetic and geochemical signature
作者单位：State Key Laboratory of Litho spheric EvolutionInstitute of Geology and GeophysicsChinese Academy of Sciences Key Laboratory of Cenozoic Geology and EnvironmentInstitute of Geology and GeophysicsChinese Academy of Sciences Department of GeosciencesUniversity of Tuebingen
会议名称：《中国科学院地质与地球物理研究所2013年度（第13届）学术年会》
会议日期：2014年
学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 08[工学] 09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学]
基 金：supported by the National Nature Science Foundation of China(Grants 40804014,20677059 and 40821091) the Chinese Academy of Science(CAS)
关 键 词：Environmental magnetism Rock and mineral magnetism Asia
摘 要：The presence of heavy metals(HMs) in the environment is a major threat for *** proxies provide a rapid method for assessing the degree of HM pollution in environment. We have studied farmland soil irrigated with polluted river water in the vicinity of a steel plant in Loudi city(Hunan Province,China) to test the efficiency of magnetic methods for detecting the degree of HM *** magnetic and non-magnetic(microscopic,chemical and statistical) methods were used to characterize these farmland *** magnetic concentration values were found in the upper arable soil horizon(0-20 cm),which is related to the presence of spherical～10 to 30μm sized magnetite *** spatial distribution of magnetic concentration and HM contents in the farmland soils matches with the spatial pattern of these parameters in river *** findings provide evidence that HM pollution of the farmland soil is mainly caused by irrigation with *** Zn,Pb,Cu,Cd,Co, Ni,V are well correlate with magnetic susceptibility(χ).The pollution load index(PLI) of all nine anthropogenic HMs(including also Cr and Mo) and log(χ) are significantly correlated. Using the resulting linear PLI-log(χ) function,values ofχcan serve as a convenient tool for semi-quantifying the degree of HM pollution in the uppermost～20 cm of the studied farmland *** findings suggest that magnetic methods can generally serve as a convenient tool for detecting and mapping HM pollution in farmland soil irrigated with wastewater from sites nearby heavy industrial activities.