Sequential injection lab-on-valve simultaneous spectrophotometric determination of trace amounts of copper and iron
Sequential injection lab-on-valve simultaneous spectrophotometric determination of trace amounts of copper and iron
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DOI：
10.1016/j.talanta.2005.04.073
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发表时间：
2006-01-15
期刊：
影响因子：
6.1
通讯作者：
Polasek, M
中科院分区：
文献类型：
--
作者：
Ohno, S;Teshima, N;Polasek, M
建立了一种同时测定铜和铁的阀门实验室(LOV)顺序进样(SI)方法。检测化学以2-(5-brono-2-pyridylazo)-5-[N-(3-propyl-N-(3-sulfopropyl)amino]aniline(5-溴-PSAA)与铜(II)和/或铁(II)在pH值为4.6时形成络合物为基础。铜(II)与5-溴-PSAA反应生成的络合物在580 nm处有最大吸收，而铁(III)不发生反应。在还原剂存在的情况下，只形成铁(II)-5-溴-PSA络合物并在558次检测到。在最佳实验条件下，铜的测定范围为0.1~2 mg L(-1)，铁的测定范围为0.1~5 mg L(-1)，采样速率为18h(-1)。检出限为铜50微克L(-1)，铁25微克L(-1)。在标准溶液中测定时，对0.5 mg L(-1)铜和0.5 mg L(-1)铁的相对标准偏差(n=15)分别为2%和1.8%。在铜铁比为1：10~5：1的人工混合溶液中，测定0.2~2 mg L(-1)铜和0.2~5 mg L(-1)铁的回收率为96~10 5%。该方法成功地用于多元素标准溶液和工业废水中铜和铁的同时测定。(C)2005 Elsevier B.V.保留所有权利。
A sequential injection (SI) method in a lab-on-valve (LOV) formal for simultaneous spectrophotometric determination of copper and iron has been devised. The detection chemistry is based oil the complex formation of 2-(5-brono-2-pyridylazo)-5-[N-(3-propyl-N-(3-sulfopropyl)amino]aniline (5-Br-PSAA) with copper(II) and/or iron(II) at pH 4.6. Copper(II) reacts with 5-Br-PSAA to form the complex which has all absorption maximum at 580 nm but iron(III) does not react. In the presence of a reducing agent only iron(II)-5-Br-PSAA complex is formed and detected at 558 run. Under the optimum experimental conditions, the determinable ranges are 0.1-2 mg l(-1) for copper and 0.1-5 mg l(-1) for iron, respectively, with a sampling rate of 18 h(-1). The limits of detection are 50 mu g l(-1) for copper and 25 mu g l(-1) for iron. The relative standard deviations (n = 15) are 2% for 0.5 mg l(-1) copper and 1.8% for 0.5 mg l(-1) iron when determined in standard solutions. The recoveries range between 96 and 105% when determining 0.25-2 mg l(-1) of copper and 0.2-5 mg l(-1) of iron ill artificial mixtures at copper/iron ratios of 1: 10 to 5: 1. The proposed SI-LOV method is Successfully applied to the Simultaneous determination of copper and iron ill multi-element standard solution and in industrial wastewater samples. (c) 2005 Elsevier B.V. All rights reserved.