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聚氨清漆中的主要原料甲苯二异氰酸酯(TDI)是车间劳动卫生监测项目之一,目前国内外多采用比色法测定,但方法灵敏度较低,不能满足PPb级浓度的分析,且使用了剧毒物质萘乙二胺。本文发现TDI水解产物与萘乙二胺的生成物具有极谱活性,当选用8-羟基喹啉作偶合剂后,在波峰电位-0.62V(vc.S.C.E.)处有一非常灵敏吸附波。对水解酸度、水解液用量、氨基磺酸铵及8-羟基喹啉用量等试验条件探讨,提出了一种新的测定方法。其灵敏度较比色法高10倍,检出下限为0.25μg/10ml;TDI浓度在0.25～10μg/ml之间有良好的线性关系;重现性好,合并变异系数为4.3%;平均回收率98.3%,同比色
Toluene diisocyanate (TDI), the main raw material in polyurethane varnish, is one of the labor hygienic monitoring items in the workshop. At present, the method of colorimetric determination is mostly used at home and abroad, but the sensitivity of the method is low, which can not meet the PPb level concentration analysis. Toxic substances naphthylethylenediamine. It is found that the products of TDI hydrolyzate and naphthylethylenediamine have polarographic activity. When 8-hydroxyquinoline is used as the coupling agent, there is a very sensitive adsorption wave at the peak potential of -0.62V (vc.S.C.E.). The hydrolysis conditions such as acidity, amount of hydrolyzate, ammonium sulfamate and 8-hydroxyquinoline were discussed. A new measuring method was proposed. The sensitivity was 10 times higher than the colorimetric method, the detection limit was 0.25μg / 10ml; TDI concentration between 0.25 ~ 10μg / ml had a good linear relationship; good reproducibility, combined coefficient of variation was 4.3%; average recovery 98.3%, same color