微波消解-原子荧光法测定浙江近岸海域沉积物中的砷

采用微波消解-原子荧光法对浙江近岸海域沉积物中砷含量进行了测定，避免了传统湿法消解海洋沉积物耗时久、劳动强度大及产生有害气体和干法消解易造成回收率偏低等问题。在选定的实验条件下，进行了微波消解、干法消解、湿法消解三种前处理方法的比较。在最佳条件下，方法的线性范围为0.0～20.0μg/L，相关系数为0.9998，检出限为0.02 mg/kg，实际海洋沉积物样品加标回收率为77.96%～105.4%，相对标准偏差（n=6）为0.48%～5.84%。本方法简单快速，基体干扰小，重现性好，回收率令人满意，能满足海洋沉积物中砷的分析。

Determination of Arsenic in Sediments of Zhejiang Offshore by Microwave Digestion and Atomic Fluorescence Spectroscopy

A method for determination of arsenic in sediments of Zhejiang offshore by microwave digestion and atomic fluorescence spectroscopy was assessed, which avoided the drawbacks of time-consuming, laborious and bringing harmful gases of traditional wet digestion and low recovery of dry digestion. Under the selected experimental condition, microwave digestion, wet digestion, and dry digestion has been well compared. Under the optimized condition, the linearity of the method was ranged from 0 to 20.0 μg/L, with a correlation coeffi-cient of 0.999 8. The limit of detection was 0.02 mg/kg. The recoveries of real sediment samples were 77.96%-105.4%with the relative standard deviation of 0.48%-5.84%（n=6）. The proposed method was simple, rapid, lit-tle interference, a satisfactory recovery with high reproducibility, and could be successfully applied for the de-termination of arsenic in sediments samples.