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三氯乙烯能与醇、醚及油类相混合,微溶于水,受光及轻金属(如铝、镁)作用能分解成氯化氢,与开放性火焰接触可产生光气。我国工业企业设计卫生标准(GBJ 1-62)规定:空气中三氯乙烯最高容许浓度为50毫克/米~3。空气中三氯乙烯的测定方法有呋喃呲啶此色法和硝酸银比浊法。前者常因加热蒸发而引起三氯乙烯的损失,且色度随加热的时间而变,使分析结果不够准确;后者须先经燃烧(850～900℃)成无机氯,再行此浊测定,其设备装置复杂,操作麻烦。我们应用乙醇和氢氧化钠将三氯乙烯分解成无机氯离子,然后采用硝酸银比浊法测定,证实方法简便,效果良好,现将操作方法归纳介绍如下:
Trichlorethylene with alcohols, ethers and oils mixed slightly soluble in water, light and light metals (such as aluminum, magnesium) can be decomposed into hydrogen chloride, and the open flame can produce phosgene. China’s industrial design hygiene standards (GBJ 1-62) provides: air trichlorethylene maximum allowable concentration of 50 mg / m ~ 3. Trichlorethylene in the air determination of furan pyridine pyridine color and silver nitrate turbidimetric method. The former often due to heat evaporation caused trichlorethylene loss, and the color temperature changes with the heating time, so that the results of the analysis is not accurate enough; the latter must be burned (850 ~ 900 ℃) into inorganic chlorine, and then turbid determination Its equipment is complicated and troublesome to operate. We use ethanol and sodium hydroxide will trichlorethylene decomposition of inorganic chloride ions, and then the use of silver nitrate turbidimetry, confirmed that the method is simple, good results, now the operation method is summarized as follows: