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不对称变色酸双偶氮类显色剂的褪色反应已广泛地应用于微量铂系元素的催化分光光度法测定．二溴邻羧基偶氮氯膦（ＤＢＯＫＣＰＡ）是近年来合成的具有多卤素取代基的不对称变色酸双偶氮氯膦类显色剂，主要用于稀土、镁和锶的光度测定．本文发现，在Ｈ２ＳＯ４介质中，ＫＢｒＯ
Asymmetric chromotropic acid disazo color reagent color reaction has been widely used in trace platinum catalytic spectrophotometry. Dibromocarboxycarboxylazonophosphoric acid (DBOKCPA) is an asymmetric chromotropic acid bisphosphonochloridochlorophosphoric acid reagent synthesized in recent years and is mainly used for photometric determination of rare earth, magnesium and strontium. This paper found that, in H2SO4 medium, KBrO