Decomposition of marine biological tissues for determination of arsenic, selenium, and mercury using hydride-generation and cold-vapor atomic absorption spectrometries.

Three decomposition procedures for marine biological tissue samples were investigated for the subsequent determination of arsenic, selenium, and mercury by using hydride-generation and cold-vapor, AAS, respectively. (i) Decomposition with nitric acid under pressure in a PTFE bomb resulted in low values for arsenic and selenium but was adequate for the subsequent determination of mercury. (ii) Decomposition with nitric, sulfuric, and perchloric acids gave the highest values for arsenic and selenium, whereas mercury was partly lost under these conditions. (iii) Combustion in a stream of oxygen could be applied for all three elements and gave results that were in good agreement with the mean values of an intercalibration. Pressure decomposition with nitric acid is recommended for mercury, followed by a sulfuric and perchloric acids treatment for the subsequent determination of arsenic and selenium. Detection limits under routine conditions are 0.3 mg/kg for arsenic, 0.2 mg/kg for selenium, and 0.005 mg/kg for mercury. 29 references, 4 tables.

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