摘要
在稀H2 SO4 介质中 ,以Fe 催化高碘酸钾 (KIO4 )氧化亚甲蓝 (MB)反应为基础 ,拟定了测定痕量铁的新方法。在90℃水浴中加热 2 0min ,于 664nm波长处 ,测定亚甲蓝的吸光度值 ,方法线性范围 0～ 4μg/L ,检出限为 0 10 μg/L。选择性和重复性好 ,操作简便。应用于测定蒸馏水、瓶装纯净水、自来水和瓶装矿泉水中的铁 ,加标回收率为 95 2 %～ 10 0 2 % ,相对标准偏差为 1 48%～ 3 1%。
A kinetic spectrophotometry for the determination of trace iron has been developed It is based on the catalytic effect of Fe*#on the methylene blue(MB)oxidized by periodate in dilute sulfuric acid After heating on the bath of hot water (90℃) for 20min,and cooling by flowing water for 3min,the reaction was monitored spectrophotometrically by measuring the decoloration of methylene blue at 664nm within 30min A linear relationship exists in the concentration range of 0-4μg/L for Fe*#and the detection limit is 0 10μg/L The proposed method has been applied to the determination of iron in distilled water,clean water,tap water and mineral water The results were proved to be satisfactory
出处
《冶金分析》
CAS
CSCD
北大核心
2002年第4期39-41,共3页
Metallurgical Analysis
