Abstract:After the sample was fused with potassium hydroxide, leached by hot water and neutralized by nitric acid, boron in geological samples was determined by inductively coupled plasma-mass spectrometry(ICP-MS). The impact of sample fusion method, the amount of potassium hydroxide and the solution acidity were discussed. The result indicated that 0.100 0 g of sample could be completely fused by 1.0 g of potassium hydroxide, and the impact of nitric acid in the test solution on determination could be neglected with the volume fraction of nitric acid of 2.0%. The impact of matrix effect and signal drift on the results was reduced with 11B as analysis isotope and 103Rh as internal standard. The linear scope of this method was 2.5-1 250 μg/g and the detection limit was 0.52 μg/g. The method was used for determination of the certified reference materials for stream sediment, soil and rock. The results were within the tolerant error of certified value with relative standard deviations (RSD, n=10) less than 8%.
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