我们在试验中发现锰(Ⅱ)离子与兴多偶氮氯膦Ⅰ(以下简写作KCPAI)有较灵敏的显色反应。显色反应试验方法如下: 在25ml容量瓶中加入锰(Ⅱ)标准溶液(10μg·ml~(-1))3ml,KCPAI(0.1%)3ml及pH7.7六次甲基四胺缓冲溶液5ml。每加一种试剂后应充分摇匀。加水至刻度,摇匀。10分钟后用1cm比色皿,于574nm波长处,以试剂空白为参比测得其吸光度。 We found in the experiment that manganese (II) ions are more sensitive to chromogenic reaction with chlorophosphonazo Ⅰ (hereinafter referred to as KCPAI). The color reaction test was as follows: 3 ml of a standard solution of manganese (II) (10 μg · ml -1), 3 ml of KCPAI (0.1%) and 5 ml of a solution of hexamethylenetetramine at pH 7.7 were added to a 25 ml volumetric flask, . Shake well after adding a reagent. Add water to the mark, shake well. After 10 minutes with 1cm cuvette, at 574nm wavelength, reagent blank as the reference measured absorbance.