催化动力学荧光法同时测定SCN^—和I^—

SIMULTANEOUS CATALYTIC DETERMINATION OF THIOCYANATE AND IODIDE BY SPECTROFLUORIMETRY

利用Ｉ￣－、ＳＣＮ￣－都对Ｃｅ（Ⅳ）与Ａｓ（Ⅲ）的氧化还原反应具有催化作用的特点，动力学荧光法测定Ｉ￣－、ＳＣＮ￣－含量。又利用ＳＣＮ￣－时上述氧化还原反应的催化活性在一定条件下会失去的特点，选择性测定Ｉ￣－，进尔计算出ＳＣＮ￣－的含量，测定Ｉ￣－、ＳＣＮ￣－的线性范围分别为６．０×１０￣（－４）～６．０×１０￣（－３）、６．９×１０￣（－２）～１．４ｍｇ／Ｌ．水样回收率分别为８５％～１１０％和８８％～１１７％。

Spectrofluorimetry was applied to catalytic determination of thiocyanate and iodidein the redox reaction between cerium(Ⅳ)and arsenic(Ⅲ).Because thiocyanate had the character-istic of selective inactivation of the catalytic activity,the amount of only iodide and the amount ofboth thiocyanate and iodide were determinated separately. The linear ranges of I￣- and SCN￣- were6. 0×10￣(-4)～6. 0×10￣(-3)mg/L and 6. 9×10￣(-2)～1. 4mg/L respectively and recovery rates of I￣- andSCN￣- in water sample were 85%～110%and 88%～117%。