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0%,and the detectability are as fellows, methanol:1×10-3μg,chloroform: 2×10-3μg, pyridine: 5×10-3μg,tetrahydrofuran: 2×10-3μg, N,N-dimethylformamide: 8×10-3μg.

0 % ,最小检出量 :甲醇为 1× 10 -3 μg ;氯仿为 2× 10 - 3μg ;吡啶为 5× 10 -3 μg;四氢呋喃为 2× 10 -3 μg ;二甲基甲酰胺为 8× 10 -3 μg。

The method of GB2449-92 is improved by reducing the sample volumes of standard solution of arsenic for calibration curve,and obtained the result of reducing the minimum detectable concentration of arsenic,from 0.

用GB2449-92规定的二乙基二硫代氨基甲酸银光度法测定硫磺中的砷含量,并对测定方法进行了改进,减少了工作曲线中砷标准溶液取样量,将砷的最小检知量由GB2449-92规定的w=0。