Continuous Hydride Generation with Direct Current Plasma Emission Spectroscopic Detection for Total Arsenic Determinations (HY-DCP)

Publisher Website
Google Scholar
Abstract
Total arsenic determinations in complex food matrices can be performed with a high degree of accuracy and precision using an initial hydride formation step followed by direct current plasma (DCP) emission spectroscopic detection1. The hyphenated technique, HY-DCP, uses a continuous flow hydride formation step with dual mixing of the hydride forming reagents, followed by on-line, continuous introduction of the aqueous arsenic sample. The final aqueous solution of arsine, excess sodium borohydride, and sample components, is directly introduced into the conventional spray chamber of the DCP instrument. Calibration plots for both arsenate and arsenite have been determined, together with linearities and minimum detection limits (MDLs) The overall methods for total arsenic determination have been applied to spiked water and tunafish samples. Accuracy and precision determinations have been performed for these total arsenic analyses, and compared with continuous hydride formation-flame atomic absorption (FAA) detection, as well as sequential hydride formation-FAA methods. All of these results are then compared, with the individual advantages and disadvantages o f each approach summarized.

This publication has 11 references indexed in Scilit: