Determination of Monomethylarsenous Acid by Hydride Generation - Gas Phase Molecular Absorption Spectrometry

  1. Sanz-Asensio, J. 1
  2. Martínez-Soria, M.T. 1
  3. Plaza-Medina, M. 1
  4. Pérez Clavijo, M. 1
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

Revista:
Analytica Chimica Acta

ISSN: 0003-2670

Ano de publicación: 1999

Volume: 381

Número: 2

Páxinas: 331-339

Tipo: Artigo

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DOI: 10.1016/S0003-2670(98)00750-8 SCOPUS: 2-s2.0-0345148778 WoS: WOS:000078475200021 GOOGLE SCHOLAR

Outras publicacións en: Analytica Chimica Acta

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Resumo

This paper presents a method for the determination of methylarsenous acid which is converted into gaseous methylarsine by adding a sodium tetrahydroborate(m) solution. The generated arsine is collected in a liquid nitrogen cryogenic trap. This is revolatilized and driven to the quartz flow cell and measured by gas phase molecular absorption spectrometry with diode array detection. The spectra obtained over a wide range of wavelengths allows multivariate calibration. The parameters affecting the production and collection of the arsines are studied. The detection limit, (6 x SD of blank) = 2.8 ng ml-1 and the relative standard deviation (n = 10) at 28 ng ml-1 was 5.3%. An interference study is made.