A method for determining silver in aluminum alloy sample by inductively coupled plasma atomic emission spectrometry(ICP-AES) with sample was dissolved by acid was proposed. The selection of acid for dissolution, matrix and the interference of coexistent elements were disscussed. The result indicated that after aluminum alloy was dissolved by nitric acid (1+1) and hydrofluoric acid and added to the constant volume , ICP-AES was used for determination,by selecting 328.028 nm line as silver analysis spectral line, the interference of matrix and coexistent elements may be prevented. The detection limit of the method was 0.004 4 μg/mL. The RSD of the testing result of the five parallel samples was less than 3.2%. Aluminum alloy sample of different silver content was tested, with the result consistent with that of atomic absorption spectrometry. The method is suitable for the determination of silver (with the content of 0.002 4%-0.273%) in aluminum alloy and is appropriate for on-site production quality control.
Key words
inductively coupled plasma atomic emission spectrometry(ICP-AES) /
aluminum alloy /
silver
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References
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