A new continuous hydride generator for the determination of arsenic, Antimony and tin by hybride generation atomic absorption spectrometry

✍ Scribed by Xiao-Chun Le; William R. Cullen; Kenneth J. Reimer; Ian D. Brindle

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 814 KB
• Volume: 258
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)85106-g

✦ Synopsis

Ahstraet

A new contmuous hydnde generator IS described Its charactenstlcs are compared with a conventional hydnde generator for the determmatton of arsenic, antimony and tm by usmg flame atonuc absorption spectrometly Thus sunple hydride generator combmes hydnde production and gas-bqmd separation m one umt, obvlatmg the use of a separate nuxmg/reachon cxul and gas-hqmd separator RadIoactIve tracer studlea show that a hydnde generation effiaency of over 95% 1s achieved with the new hydnde generator and that approximately 90% of monomethylarsomc acid (MMA) IS converted to its hydnde (methylarsme) wlthm the first 10 s of the hydride generation reactlon Compared to a conventlonal hydnde generator, an unproved slgnal-to-noise ratlo IS achieved and comparable or less mterference from transItion metal Ions 1s observed Cysteme (1% m the sample solution) IS effective m reducmg mterferences durmg the hydnde generation processes In the presence of cysteme, 10-1000 fold higher amounts of Nl*+ , Co*+ and Cu*+ are tolerated m the determmafion of arsenic, antunony and tm Cysteme also enhances the signals of arsemc, antimony and tm by 60, 200 and 40%, respectively Reaction conditions were optlmlzed by usmg both the simplex optlmlzahon method and one-factor-at-a-time method and results are m good agreement -or& Atonuc absorption spectrometty, Hydnde generation, Antimony, Arsemc, Tm