土壤中砷的经口生物可给性测定研究OACHSSCD

To establish a quantitative method for determining the oral bioaccessibility of arsenic in soil,a simulated gastric extraction solution was used to extract arsenic from soil samples,and the arsenic concentration in the extract was determined by Inductively Coupled Plasma Mass Spectrometry(ICP-MS)method.The oral bioaccessibility of arsenic was calculated based on the ratio of extractable arsenic to total arsenic content.The results showed that the method exhibited good linearity within the range of 0 μg/L to 100 μg/L,with a correlation coefficient of 0.999 9.The method detection limit was 0.007 mg/kg.The relative standard deviations of spiked samples ranged from 1.7%to 6.1%,and the spike recoveries ranged from 94.8%to 95.8%.The measured oral bioaccessibility of arsenic in an actual soil sample was 3.78%.The method is characterized by simple operation,high accuracy,good precision,and satisfactory stability.It is suitable for the determination of oral bioaccessibility of arsenic in soil and can provide technical support for human health risk assessment and risk management of arsenic-contaminated sites.