Determination of arsenic in chicken feed by hydride generation atomic absorption spectrometry after pre-concentration with polyurethane foam

Abstract

A pre-concentration procedure with solid-phase extraction was developed for the determination of arsenic (As) in chicken feed using hydride generation atomic absorption spectrometry (HG-AAS). The procedure was based on the sorption of As(III) ions as complexes with ammonium pyrrolidine dithiocarbamate onto a mini-column packed with polyurethane foam. After pre-concentration, the As was removed from the mini-column by acid solution, and the analyte content in the eluate was measured by HG-AAS. The following main experimental conditions were established: adjustment of the As solution pH with 0.05 mol l⁻¹ HCl, 2.88 × 10⁻³ mol l⁻¹ complexing agent concentration and 6.0 mol l⁻¹ eluting hydrochloric acid concentration. The proposed method produced an enrichment factor of 67, with 0.050 and 0.165 µg g⁻¹ limits of detection and quantification, respectively. The procedure was applied to the determination of As content in two types of chicken feed using the proposed procedure and atomic absorption spectrometry with electrothermal atomisation (ETAAS). The t-test indicated that the results were not significantly different at a confidence level of 95%.

A review of reflux systems using cold finger for sample preparation in the determination of volatile elements

“…Also the mass and nature of the sample are critical parameters due to the risk of explosions. Recently, these bombs were employed for sample digestion of chicken samples for determination of arsenic [19].…”

An on-line preconcentration system for the determination of selenium in seawater samples

“…This technique allows concentration and purication of the analyte solution by sorption on a solid adsorbent. [10][11][12] The mechanism of retention of the analyte on a solid sorbent depends on the chemical nature of the sorbent and can be a simple adsorption, complexation or ion exchange. Different sorbents have been used in preconcentration procedures, such as activated carbon, silica gel, cellulose, alumina, polyurethane foam, polyester, polytetrauoroethylene, among others.…”