Abstract：There are many kinds of indium-rich soot samples. Such samples cannot be completely dissolved using the conventional acids, and it should be fused with strong alkali at high temperature. The sample was fused with sodium peroxide in experiments, and it could be fully dissolved after leaching with hydrochloric acid. The content of indium in sample solution was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). When the mass concentration of indium was in range of 1.00-20.00 μg/mL, the linear correlation coefficient (r) of calibration curves was 0.999 9. The limit of detection was 0.001% (mass fraction). The content of indium in four typical indium-rich soot samples was determined according to the experimental method. The relative standard deviations (RSD, n=11) were less than 2%, and the spiked recoveries were between 99% and 103%. The determination results were consistent with those obtained by standard addition method and working curve method with correction.
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