I am working on checking arsenic concentration in water samples and will possibly apply any treatment method, is it necessary to preserve my samples in laboratory (before and after treatment) with dilute nitric acid for arsenic determination by graphite furnace atomic absorption spectrophotometer?
Refer APHA Book to get detailed procedure for arsenic. For mercury estimation in water, i referred this book and got best results.
Its ok to digest the samples with nitric acid and after that you can measure arsenic by AAS.
What for nitric acid is required for digestion of Arsenic in water. In practice good results have been observed directly by analysis with AAS . However for confirmation, the results can be checked with standard solutions of Arsenic.
Water samples are preserved with nitric acid, or filtered and acid preserved and digested, sediment samples are always digested. Some sample solutions, especially waste waters and digestions of sediments, may contain large amounts of substances that may affect the results. High concentrations of chloride may cause low results, because the volatility of many elements are increased and analyte loss may occur during the pyrolysis step! Matrix effects may be overcome in different ways, different modifiers are suggested to reduce the interference effects.
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