China Nonferrous Metallurgy

In order to solve the problem of sample dissolution in the determination of impurity elements in ferric phosphorus samples by inductively coupled plasma emission spectrometry (ICP-OES), this paper uses sodium hydroxide + sodium carbonate to melt the tested ferric phosphorus samples, and then uses inductively coupled plasma emission spectrometer to determine silicon, manganese, titanium, vanadium and chromium in the samples. The results showed that the detection limit of each element was 0.0016%~0.0080% and the lower limit was 0.0064%~0.032%. The relative error RE of each element content between the results and the standard sample was less than 5%, the recovery rate was 95.1%~102.4%, and the relative standard deviation was less than 5%. RSD of the three actual samples is less than 5%, which indicates that the method has good precision and accuracy, and can meet the detection requirements. The method overcomes the insoluble characteristics of the phosphorus and iron samples, and obtains the ideal detection results in a short time, and the determination results have high stability, precision and accuracy. The test method has the advantages of repeatability, short process and low cost, and is suitable for rapid analysis of large quantities of samples. It can be used as a simple, rapid and economic important means to detect iron phosphorus products.