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本文对EDTA -NaOH作为硫化氢吸收液进行探讨和研究。试验表明 :当空气中硫化氢含量为国家最高允许液度 0 .6～ 6倍时 ,吸收液采样效率为 98.2～ 10 0 % ,催化剂与显色剂混合使用 ,可降低空白值 ,提高方法灵敏度。本法准确度 ( p)为 93 .0 % ,精密度合并变异系数 (cv)为 3 .93 % ;检出限、测量限分别为 7× 10 -2 μg/5ml和1.7× 10 -1μg/5ml;规定采气量为 0 .5L时 ,则最小检出浓度为 0 .6 8mg/m3。
In this paper, EDTA-NaOH as a hydrogen sulfide absorption liquid to explore and study. The experimental results show that when the content of H2S in the air is 0.6 ~ 6 times of the maximum allowable liquid level in the country, the sampling efficiency of the absorbing liquid is 98.2 ~ 100%. The mixture of catalyst and developer can reduce the blank value and increase the sensitivity of the method . The accuracy (p) of the method was 93.0%, and the precision of the combined coefficient of variation (cv) was 3.93%. The limits of detection (LODs) were 7 × 10-2 μg / 5ml and 1.7 × 10-1μg / 5ml; provisions of the amount of gas is 0. 5L, then the minimum detectable concentration of 0 6 8mg / m3.