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用硒催化Ｎａ２Ｓ．用次甲基蓝的退色反应测定发中硒．催化反应时间与硒含量线０．１～１．０μｇ的范围内。催化反应时间与硒食量线性关系良好，精密度和准确度均很理想，ＣＶ为７．３％，回收率为８７．５～１０６％。
Selenium catalyzed by Na2S. Determination of selenium in fade reaction with methylene blue. Catalytic reaction time and selenium content in the range of 0.1 ~ 1.0μg. The linear relationship between the reaction time and selenium consumption was good, and the precision and accuracy were very good. The CV was 7.3% and the recovery was 87.5 ~ 106%.