Abstract： A method for the determination of trace aluminum in tin ingot by graphite furnace atomic absorption spectrometry was established. The sample decomposition ways and the optimal conditions of determining aluminum by graphite furnace atomic absorption spectrometry was confirmed. Sample was dissolved in hydrochloric acid and hydrogen peroxide(V (hydrochloric acid)∶V (hydrogen peroxide) = 2.5∶1.5). Aluminum was determined in 16 g/L citric acid and 0.12 mol/L hydrochloric acid medium with 4 g/L calcium nitrate as matrix modifier. The results showed that in the selected acidity medium, it was not necessary to volatilize tin that will not be hydrolyzed, and the sample solution was kept clear for a long time. Calcium nitrate improved the measurement sensitivity of aluminum and enhanced resistance to chloride interference. Tin and coexisting elements in sample did not interfere in the determination. The detection limit of this method was 2.96 μg/L. The linear range was between 0 μg/L and 100 μg/L. The correlation coefficient r was not less than 0.998 0. The relative standard deviation for the determination of aluminum in tin ingots was 6.6%, recovery rate was between 100 % to 119%, and the measured values of sample were consistent with that of the standard addition method and ICP-AES.
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SU Ai-ping, HAI Lan. Determination of trace aluminum in tin ingot by graphite furnace atomic absorption spectrometry. , 2012, 32(11): 67-71.
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