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The method is based on atomic absorption measured arsenic is generated by thermal decomposition of arsenic (III) hydride.
In terms of this approach only As (III) is converted into hydride quantified. To avoid errors when determining, any other oxidation states need to move on As (III) prior to the determination. As (III) is reduced to arsenic gas with sodium hydride tetrahydroborat AsH3 in hydrochloric acid environment.
The absorbance was measured at 193.7 nm wavelength.
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