Abstract
This paper presents a method for the determination of methylarsenous acid which is converted into gaseous methylarsine by adding a sodium tetrahydroborate(III) 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 × 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.
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