期刊
FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY
卷 367, 期 7, 页码 653-657出版社
SPRINGER-VERLAG
DOI: 10.1007/s002160000428
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An on-line zinc preconcentration and determination system implemented with inductively coupled plasma atomic emission spectrometry (ICP-AES) associated with flow injection (FI) was studied. The zinc was retained as zinc-2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Zn-(5-Br-PADAP)) complex at pH 9.2. The zinc complex was removed from the knotted reactor (KR) with 30% v/v nitric acid. An enrichment factor of 42 was obtained for the KR system with respect to ICP-AES using pneumatic nebulization. The detection limit for the preconcentration of 10 mL of aqueous solution was 0.09 mu g/L. The precision for 10 replicate determinations at the 5 mu g/L Zn level was 2.3% relative standard deviation (RSD), calculated with the peak heights obtained. The calibration graph using the preconcentration system for zinc was linear with a correlation coefficient of 0.9997 at levels near the detection limits up to at least 100 mu g/L. The method was succesfully applied to the determination of zinc in river water samples.
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