高砷地下水中砷的形态检测

地下水中砷污染严重影响着人类的健康,砷的生态毒理效应主要取决于其存在形态。文章用阴离子交换柱对内蒙古杭锦后旗高砷地下水在现场进行分离,在室内用原子荧光光度计进行检测。总砷浓度范围为80~1172μg/L,其中A(sⅢ)浓度百分含量为75.37%~92.39%,A(sⅤ)和颗粒态砷浓度百分含量分别为0.56%~13.87%、5.87%~20.65%。形态分析结果表明,该地区主要是还原环境,且颗粒态砷占有一定的比例,这对于进一步研究砷的去除和砷的地球化学行为有一定的指导意义。

Detection of Arsenic Species in High Arsenic Groundwater

Arsenic in groundwater has seriously affected human health. Ecotoxicological effects of arsenic depend on the speciation of arsenic. High arsenic groundwater from Hangjinhouqi,Inner Mongolia was sampled and arsenic species were separated on-site with anion exchange column and detected by atomic fluorescence spectrometer. Results showed that total arsenic concentration varied from 80 to 1,172μg/L,with a ratios of As(Ⅲ)to total As from 75.37% to 92.39% while As(Ⅴ) and particulate arsenic from 0.56% ~13.87% and 5.87% ~20.65% respectively. Results indicated that high concentrations of arsenic in shallow aquifers are associated with strongly reducing conditions. Particulate arsenic constitutes certain proportion of total arsenic,which will be useful for both optimizing treatment options and studying the geochemical behavior of arsenic in high-As groundwater.