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3.砷的比色分析法在化工标准中,砷是较多产品必测的项目,而且其技术要求也是很严格的。在一般的仪器分析方法中,例如用原子吸收法或原子荧光分析法,都要把砷转化成砷化三氢,即先进行“氢化”,再进行测定。这就比一般的原子吸收或原子荧光分析法麻烦。微量砷的比色测定的方法有两种:一个是应用时间已很久的古蔡氏法,它的比色是比较试样对溴化汞试纸所生色泽;另一个是采用二乙氨基二硫代甲酸银作试剂的比色分析法,它也可以用分光光度法进行测定。这
3. Arsenic colorimetric analysis In the chemical industry standard, arsenic is the product of more products to be tested, and its technical requirements are also very strict. In a typical instrumental analysis method, for example, atomic absorption spectrometry or atomic fluorescence spectrometry is used to convert arsenic to arsine. That is, “hydrogenation” is carried out first and then the measurement is carried out. This is more troublesome than conventional atomic absorption or atomic fluorescence spectrometry. Trace arsenic colorimetric assay in two ways: one is the application of time has a long ancient Chua’s law, its colorimetric comparison of samples of mercury bromide test paper color; the other is the use of diethylamino dithio Colorimetric analysis of silver formate reagents, which can also be determined spectrophotometrically. This