在偶氮类化合物与铋的的显色反应中,对吡啶偶氮类的显色反应研究颇多[1—4]但变色酸偶氮类化合物与铋的显色反应的研究尚未见报导.作者从几种偶氮氯膦类显色剂中筛选出马尿酸偶氮氯磷,并对其与铋的显色反应进行了研究,在硝酸介质中,水相显色具有较高的灵敏度,表现摩尔吸光系数ε’=7.31×10~4;Sandell灵敏度S=0.00285μg·cm~(-1),且显色速度快,稳定性好,在25毫升溶液中含铋量在0—20μg范围内符合比尔定律. In the color reaction of azo compounds with bismuth, there are many studies on the color reaction of pyridine azo compounds [1-4]. However, the research on the color reaction of azo compounds with bismuth has not been reported yet. The authors selected several chlorophosphonazo-type developers from the chlorophosphorylazo-uracil chlorophosphate, and its color reaction with bismuth was studied in the nitric acid medium, the water phase with high sensitivity, performance Molar extinction coefficient ε ’= 7.31 × 10 ~ 4; Sandell sensitivity S = 0.00285μg · cm -1, and the color fast, good stability, in 25 ml of solution containing bismuth in the range of 0-20μg In line with Bill’s law.