痕量铁的化学发光法测定

Determination of Trace Iron by Chemihminous Method

基于痕量Ｆｅ（３＋）离子对溶解氧在碱性介质中氧化鲁米诺的反应具有催化作用，提出一种测定药物和饮用水中铁的化学发光法。铜试剂可作为增敏剂和Ｃｕ￣（２＋）离子的掩蔽剂．Ｆｅ￣（３＋）离子的含量在１．０～１０．０ｎｇ·ｍｌ￣（－１）内与化学发光强度成正比关系。本方法简便易行，检测限为１．４×１０￣（－１０）ｇ·ｍｌ￣（－１），相对标准偏差为１．６％和２．８％，回收率为９４．０％和９６．５％。

Based on the catalytic action of trace Fe￣(3+) ion on the oxidation of lumi-nol by dissolved oxygen in alkaline medium,a novel chemiluminous method for the determi-nation of iron in pharmaceutical and drinking water has been developed.The sodium diethyl-dithiocarbamate can be used as a sensitizer and masking agent for Cu￣(2+) ion. The chemilumi-nous intensity is proportional to the concentration of Fe￣(3+) ion within the range of 1.0～10.0ng/ml.This method is acceptable and realizable. The detection limit is 1.4× 10￣(-10)g/ml.Therelative standard deviations are 1.6%and 2.8%and the recoveries are 94.0%and 96.5%.