采用盐硝混酸加少量氢氟酸溶解样品，酒石酸络合铌，硼酸络合过量的氟离子，用ICP-AES测定不锈钢中铌。系统的条件试验证明，不锈钢中的共存元素不干扰铌的测定，故校准曲线不必进行基体匹配。通过对标准物质的多次重复测定，方法的相对标准偏差小于2%，相对误差也小于2%，证明方法的精密度和准确度均佳。
The sample was dissolved in a mixed acid with hydrochloric,nitric and a small amount of hydrofluoric acid,and tartaric acid complexing niobium,boric acid complexing excess fluorine ion. Niobium in stainless steel was determined by ICP?AES. According to a thorough condition test,the coexistent elements of stainless steel don′t interfere with the measurement of niobium,so this method doesn′t need a calibration base on matrix matching. The standard samples of stainless steel with Nb were analyzed by the method. The values of RSD are less than 2%,and the relative error is less than 2%,which verifies the precision and accuracy of the method.
参考文献
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