锑矿土壤中As和Sb的分布、形态及生物可利用性

Distribution,speciation and bio-availability of arsenic( As)and antimony( Sb) in soils of antimony mine

采用微波消解-氢化物发生-原子荧光光谱法测定了晴隆锑矿区土壤中总砷和总锑,利用Tessier连续提取法分析土壤中不同形态砷和锑.结果表明,各采样点土壤As、Sb含量分别为17.98—127.85 mg·kg-1、171.93—601.59 mg·kg-1,远高于贵州省背景值;土壤中砷和锑的存在形态均以残渣态为主,其次是有机结合态、铁锰氧化物结合态和碳酸盐结合态,可交换态很少;土壤中生物可利用态锑占总和0.33%—1.72%,其含量为0.60—3.91 mg·kg-1,而土壤中生物可利用态砷占总和0.09%—0.57%,其含量为0.15—0.48 mg·kg-1.

HG-AFS was applied to the determination of arsenic（ As） and antimony （ Sb） in the soils near Qinglong antimony mine area with microwave assisted sample digestion. Tessier sequential extraction was used to investigate the distribution,speciation and bio-availability of As and Sb in the soils. Results showed that total arsenic content （ 17. 98-127. 85 mg·kg-1 ） and total antimony concentration （171.93-601.59 mg·kg-1） substantially exceeded their background level in Guizhou Province. The speciation of antimony and arsenic in the soils has the following distribution order：residual phase〉Fe/Mn hydrous oxides, orgnic phase, carbonate fraction＆gt;cation exchangeable. The concentration of easily bioavailable antimony was 0. 60-3. 91 mg·kg-1 and the percentage was 0？33%-1.72%, while 0.15-0.48 mg·kg-1 and 0.09%-0.57% for arsenic.