流动注射催化光度法测定环境水样中的痕量铁  

Determination of trace iron in environmental water samples by flow injection catalytic spectrophotometry

作　　者：柴红梅[1] 高楼军[1] 藏小妹[1] 柳长庆[1] 

机构地区：[1]延安大学化学与化工学院陕西省化学反应工程重点实验室,陕西延安716000

出　　处：《冶金分析》2013年第3期46-49,共4页Metallurgical Analysis

基　　金：陕西省自然科学基金项目(No.2011JM2007);延安大学自然科学重点基金项目(No.YDZ2012-09)

摘　　要：基于在硝酸介质中Fe3+对双氧水氧化铬蓝黑R的褪色反应具有催化作用,利用流动注射自动进样技术在510nm处检测显色剂浓度的变化,建立了流动注射催化动力学光度法测定痕量Fe3+的新方法。优化了反应介质、氧化剂、硝酸与双氧水的体积比、铬蓝黑R的浓度、反应温度及泵速等实验条件;考察了干扰离子的影响,对铜离子、铅离子等干扰严重的离子采用硫代硫酸钠掩蔽剂进行了干扰消除。方法的线性范围为0.08～0.68μg/mL,检出限为9.77×10-4μg/mL。对0.2μg/mL的Fe3+进行11次平行测定的相对标准偏差为0.4%,分析速度为48.6次/h。方法可用于环境水样如雨水、自来水及河水中痕量铁(Ⅲ)的测定。Fe3＋ had catalytic effect on the fading reaction of eriochrome blue black R oxidized by hydrogen peroxide in nitric acid medium.The concentration change of coloring agent was detected at 510 nm by flow injection automatic sampling technology and a new determination method of trace Fe3＋ by flow injection catalytic kinetic spectrophotometry was established.The reaction medium,oxidizing agent,the volume ratio of nitric acid and hydrogen peroxide,the concentration of eriochrome blue black R,the reaction temperature and the pump speed were optimized.The effect of interference ions was investigated.The ions with serious interference such as copper and lead were masked by sodium thiosulfate to eliminate the interference.The linear range of this method was 0.08-0.68 μg/mL,and the detection limit was 9.77×10-4 μg/mL.The relative standard deviation（RSD,n=11） of 0.2 μg/mL Fe3＋ was 0.4 %.The analytical speed was 48.6 times/h.The proposed method could be applied to the determination of trace iron （Ⅲ） in environmental water samples such as rain water,tap water and river water.

关 键 词：流动注射 催化光度法 铁 铬蓝黑R 

分 类 号：O657.32[理学—分析化学]