氯酸钾氧化铬天青S催化褪色光度法测定痕量锰

Catalytic Spectrophotometric Determination of Trace manganese Based on the Oxidizing Discoloration Reaction between Chromazurol San

基于在加热和聚丙烯酰胺（ＰＡＭ）存在下， Ｍｎ２＋催化氯酸钾氧化铬天青Ｓ（ＣＡＳ）的褪色反应，首次提出一种测定痕量锰的催化光度法。本方法的表观摩尔吸光系数ε５００＝１．２×１０６Ｌ·ｍｏｌ－１·ｃｍ－１，校正曲线方程为ΔＡ＝０．１６１２＋０．０５８０３ＣＭｎ２＋（μｇ／Ｌ）； 线性范围０．１０～１０．０μｇ／Ｌ（ｒ＝０．９９９７） ；检出限４．０×１０－１１ｇ／ｍＬ。对０．１０和１０．０μｇ／Ｌ Ｍｎ２＋测定的ＲＳＤ分别为２．３％与３．４％。 精密度好，操作简便、快速，可作为检测锰的一种可靠方法。

A new catalytic spectrophotometric determination of trace manganese Based on its catalytic Oxidizing discoloration reaction of Chromazurol S with potassium Chlorate on heating and presence of polyacrylamide has been developed .The apparent molar absorptivityε500=1.2×106L·mol-1·com-1.The equation of calibration curve isΔA=0.1612+0.05803CMn2+(ug/L)with the linear range of 0.10~10.0ug/L(r=0.9997),the detection limit for manganese is 4.0×10-11g/mL.The relative standard deviation for 11 replicate measurements of 0.10 and 10.0ug/L of Mn(II) is 2.3% and 3.4% respectively.The experiments showed that the method was accurate and reliabe.