通过采用硫代硫酸钠标准溶液代替亚砷酸钠建立DET电位滴定模式，防止检测过程中安全事故的发生。通过试验，该方法能满足分析控制的要求。%Using sodium thiosulfate instead of sodium arsenite to establish DET potentiometric titration,and prevent the safety accident In testing process .The method can meet the requirements of control.
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