Sequential Determination of Trace Amounts of Iron and Copper in Water Samples by Flow Injection Analysis with Catalytic Spectrophotometric Detection

A simple flow injection analysis (FIA) method is described for the sequential determination of iron and copper. The detection method for iron and copper is based on their catalytic activities in the oxidation reaction of N,N-dimethyl-p-phenylenediamine (DPD) with hydrogen peroxide. The sequential de...

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Bibliographic Details
Published in:	Analytical Sciences Vol. 22; no. 1; pp. 169 - 172
Main Authors:	LUNVONGSA, Sarawut, TSUBOI, Tomonori, MOTOMIZU, Shoji
Format:	Journal Article
Language:	English
Published:	Japan The Japan Society for Analytical Chemistry 2006 Japan Science and Technology Agency
Subjects:	Calibration Catalysis Copper - analysis Flow Injection Analysis - instrumentation Flow Injection Analysis - methods Hydrogen Peroxide - chemistry Iron - analysis Oxidation-Reduction Phenylenediamines - chemistry Sensitivity and Specificity Spectrophotometry - instrumentation Spectrophotometry - methods Time Factors Water - chemistry
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Summary:	A simple flow injection analysis (FIA) method is described for the sequential determination of iron and copper. The detection method for iron and copper is based on their catalytic activities in the oxidation reaction of N,N-dimethyl-p-phenylenediamine (DPD) with hydrogen peroxide. The sequential determination of iron and copper can be carried out by injecting two sample plugs into the FIA system, sequentially. One injection does not contain triethylenetetramine (TETA), and is used for the sum of iron and copper concentration; the other which contains TETA is used only for the iron concentration. For iron determination, TETA is used as a masking agent of copper. The difference in peak height can be used for the calculation of copper concentration. Under the optimal conditions, the detection limits (3 σ) of 0.01 and 0.07 µg L-1 were obtained for iron and copper, respectively. The proposed method can be applied to the determination of iron and copper in tap water and bottled-drinking mineral water samples. Good recoveries of the method, 98 - 103% for iron and 98 - 106% for copper, were achieved.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0910-6340 1348-2246
DOI:	10.2116/analsci.22.169