Speciation and Mobility of Arsenic in Agricultural Lime Speciation  

作　　者：Michael Kersten 

机构地区：[1]Johannes Gutenberg University of Mainz

出　　处：《地学前缘》2009年第S1期234-234,共1页Earth Science Frontiers

摘　　要：Agricultural liming materials are often applied to the adjustment of soil acidity and the improvement of plant growth and microbial functionality.Relatively low-grade agricultural lime was found to contain up to 125 mg/kg arsenic(As),which is above any fertilizing materials’ toxicity threshold limit.Several techniques were employed to determine the speciation of the arsenic.Results from microprobe analyses suggest that minor minerals such as black and brown dendrites are the source of high arsenic concentrations in the samples.X-ray fluorescence spectroscopy provided further information that ferrihydrite and crystalline goethite are responsible for hosting the high concentration of arsenic with Fe/As molar ratio in around 100.A five-step sequential extraction demon-

关 键 词：ARSENATE EXAFS LIME limestone DENDRITES GOETHITE romanechite 

分 类 号：S153[农业科学—土壤学]