【摘要】 本文研究了间磺酸基偶氮氯膦（简称ＣＰＡ－ｍＳ）于钯（Ⅱ）的显色反应条件，实验结果确定，在ｐＨ＝３．００～５．５０的ＨＡｃ－ＮａＡｃ缓冲溶液中，钯（Ⅱ）与ＣＰＡ－ｍＳ生成１∶２的稳定蓝色配合物，试剂的λｍａｘ＝５６０ｎｍ，配合物的λｍａｘ＝６４０ｎｍ，△λｍａｘ＝８０ｎｍ。配合物摩尔吸光系数ε＝２．１５×１０４Ｌ．ｍｏｌ（－１）．ｃｍ（－１）。Ｐｄ（Ⅱ）浓度在０．５～１８μｇ／１０ｍｌ内服从比尔定律。二十多种离子存在一定量不干扰，经离子交换分离后测定矿样中的钯量，获得满意的结果。更多还原

【Abstract】 The color reaction of Pd (Ⅱ) with chlorophosphonazo-mS (CPA-mS) is studied.Experiments show that in HAc-NaAc medium at PH = 3.5～5.5, CPA-mS and Pd (Ⅱ) form a bluecomplex which has a maximum absorption at 640 nm.At this wavelength, the apparent molar absorptivity is 2.15 × 104 L. mol-1. cm-1, The method is sensitive and selective.Beer s law is obeyed for Pd (Ⅱ) in the range of 0.5～18μg/10ml.Thismethod is applied to determination of Pd (Ⅱ) in mineral with a satisfactory result.更多还原