Determination of arsenic in sea water by sorbent extraction with hydride generation atomic absorption spectrometry

• Published in: Talanta (Oxford) 1999-07, Vol.49 (3), p.523-530
• Main Authors: Karthikeyan, S, Prasada Rao, T, Iyer, C.S.P
• Format: Article
• Language: English
• Subjects: Analytical chemistry; Arsenic; Atomic absorption spectrometry; Chemistry; Exact sciences and technology; Sea water; Spectrometric and optical methods
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/S0039-9140(99)00039-9

A rapid and sensitive sorbent extraction hydride generation-flow injection analysis atomic absorption spectrometric (HG-FIAS-AAS) method is described for the determination of As(III) and As(V) based upon online preconcentration on a microcolumn packed with activated alumina. In the present procedure these arsenicals are complexed with quinolin-8-ol-5–sulphonic acid from neutral solutions in the flow injection system and adsorbed on the column. The preconcentrated species are eluted with 10% HCl, mixed with 0.5% sodium borohydride and carried to the HG-FIAS cell with a carrier gas flow rate of 75 ml min −1. The retention efficiency is found to be better than 98% with sensitivity enhancement of 12 and 10 for As(III) and As(V), respectively, for a 20 s preconcentration period. The respective detection limits are 0.05 and 2 ng ml −1 for As(III) and As(V). The throughput of the samples is found to be 60 h −1, with a loading time of 20 s. The method has been applied to sea water samples.