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1 引 言高灵敏光度法测定铬主要有褪色法和催化法。如偶氮氯膦Ⅲ法 (ε =3.0× 10 4L·mol-1·cm-1)和二溴羧基偶氮胂 (ε=1.4× 10 5)和二溴对甲偶氮羧 (ε=1.2× 10 5)。本实验研究发现 ,用偶氮磺类试剂褪色法测定铬通常比用偶氮氯膦类、偶氮胂类及偶氮羧类试剂具有较高
1 Introduction Highly sensitive spectrophotometric determination of chromium are mainly fading method and catalytic method. Such as chlorophosphonazo Ⅲ (ε = 3.0 × 10 4 L · mol -1 cm -1) and dibromocarboxyarsenazone (ε = 1.4 × 10 5) and dibromo-p-carbazo × 10 5). The experimental study found that the azo sulfonyl reagent fading method for the determination of chromium than chlorophosphonazoles generally, arsenazo and azo carboxylaromatics reagent has a higher