空气中一甲肼监测的固体吸附/分光光度法

SOLID-SORBENT AND SPECTROPHOTOMETRIC METHOD FOR DETECTING MONOMETHYLHYDRAZINE IN AIR

研究了用固体吸附和分光光度监测空气中一甲肼浓度的方法，试验了标准气、采样管、比色酸度范围、温度、光强和干扰气对测试结果的影响。结果表明：以研制成的固体采样管富集采样，用对二甲氨基苯甲醛作显色剂，在470nm波长，2cm光径的比色皿，采集100L气样时，方法最低检出浓度为0．0031mg／m3，平均变异系数0．036，平均相对误差5．5％，测量范围为0．010mg／m3～2．50mg／m3。

The test procedure of monomethylhydrazine concentration in air detected by solidsorbent and spectrophotometric method was investigated. The effects of standard gas, sampling tube, acidity of sample, environmental temperature, light source and interfering gas on detecting accuracy were tested. The results shown that when special sampling tube of solid-sorbent was employed and the p-dimethylaminobenzaldehyde was used as color-producing reagent at 470 wave length, the minimum detectable concentration of 0. 0031mg/m3, mean variation coefficient of 0. 036 and relative error of 5. 5% were obtained with 2 cm colorimetric disc and within measurement range of 0. 001mg/m3-2.50mg/m3.