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浙江大学学报(理学版)
化学     
阴离子树脂微柱在线预富集火焰原子吸收法测定痕量镉
浙江大学西溪校区化学系 杭州 310028
Flow Injection on-line Preconcentration with Anion-exchange-resin and Flame Atomic Absorption Spectrometric Determination of Trace Cadmium
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摘要: 建立了流动注射在线微柱预富集-火焰原子吸收(FAAS)法测定天然水中痕量镉的体系.在溶液pH7.2条件下,8-羟基喹啉-5-磺酸与Cd2+形成的络阴离子被填有阴离子树脂的微柱吸附而富集.用1mol/L硝酸溶液洗脱树脂上所吸附的镉.洗脱液在线输入FAAS测定.当采样速率为24次/时,富集倍数为10,检出限0.5μg/L,工作曲线线性范围0~100μg/L,RSD为1.0%(n=11,Cd2+浓度为100μg/L).本体系已用于天然水样中痕量镉测定,回收率90%~106%.
关键词: 流动注射预富集火焰原子吸收8-羟基喹啉-5磺酸    
Abstract: A flow injection on-line micro-column preconcentration system with anionexchange- resin being used as sorbent was developed for flame atomic absorption spectrometric (FAAS) determination of trace cadmium. Cadmium ion was on-line reacted with the chelating reagent of 8-hydroxylquinoline-5-sulphonic acid(OXS) in the condition of pH 7.2 to form a complex anion,which was then retained on a micro-column packed with D-290 anion-exchangeresin. The retained cadmium species was eluted with a nitric acid solution of 1 mol.L-1,and the elutant was directly transported into the nebulizer of the FAAS. Under the optimized conditions, an enrichment factor of 10 was achieved for a loading period of 120 seconds,and a detection limit of 0.5 μg.L-1 and a relative standard deviation of 1.0% for eleven determinations of 0.1 mg.L-1 cadmium standard solution were obtained at the sampling frequency of 24 h-1. The proposed method has been applied to determine the trace amount of cadmium in fresh water samples.
Key words: flow injection    preconcentration    flame atomic absorption spectrometry    cadmium    water analysis
收稿日期: 1998-07-17 出版日期: 2017-05-15
:  O657  
基金资助: 浙江省分析测试基金资助课题
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毛雪琴
陈恒武
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陈裕稽
朱国锋

引用本文:

毛雪琴,陈恒武,金劲草,陈裕稽,朱国锋. 阴离子树脂微柱在线预富集火焰原子吸收法测定痕量镉[J]. 浙江大学学报(理学版), .

Mao Xueqin,Chen Hengwu,Jin Jincao,Chen Yuji,ZhuGuofeng. Flow Injection on-line Preconcentration with Anion-exchange-resin and Flame Atomic Absorption Spectrometric Determination of Trace Cadmium. Journal of ZheJIang University(Science Edition), .

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http://www.zjujournals.com/sci/CN/        http://www.zjujournals.com/sci/CN/Y1999/V26/I1/59

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