Abstract
The suction-flow on-line column preconcentration of cadmium from an aqueous solution for inductively coupled plasma atomic emission spectrometry (ICP-AES) was investigated utilizing a column packed with gas chromatographic-grade porous active-carbon impregnated with 8-quinolinol. A sample solution (pH 2.5–7) and a buffer solution were sucked, mixed and pumped through the column; subsequently, the analyte was eluted directly into the nebulizer of the ICP with 1 cm3 of 0.5 mol dm3 hydrochloric acid. Using 5 cm3 of the sample solution, this method gave a signal enhancement of 1 order of magnitude for cadmium, better than that obtained by a conventional nebulization system; the detection limit was 0.25 ng cm−3 with a sampling rate of 35 h”1. The relative standard deviation for 500 ng cadmium was 1.1% (n=10). This column could be used for more than 80 replicate analyses when 5 cm3 of a standard solution containing lOOngcm”3 cadmium(II) was introduced into the system each time. The proposed method was applied to the determination of cadmium in certified biological reference materials.
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Okamoto, Y., Murata, A. & Kumamaru, T. Determination of Cadmium by Inductively Coupled Plasma Atomic Emission Spectrometry after Suction-Flow On-Line Preconcentration on 8-Quinolinol-Loaded Active Carbon. ANAL. SCI. 7, 879–882 (1991). https://doi.org/10.2116/analsci.7.879
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DOI: https://doi.org/10.2116/analsci.7.879