Determination of 14 components in soil by inductively coupled plasma atomic emission spectrometry with lithium metaborate and lithium tetraborate fusion
The accurate determination of mineral components in soil can know the soil fertility status,and is helpful for the reasonable fertilization and improvement of soil quality.Through the optimization of sample pretreatment conditions,the fusion method with mixed flux of lithium metaborate and lithium tetraborate(m∶m=33∶67)was established.After extraction with hydrochloric acid and tartaric acid,the determina-tion method of 14 components in soil(including SiO2,Al2O3,Fe2O3,K2O,Na2O,CaO,MgO,TiO2,MnO,P2O5,Ba,V,Sr and Zr)by inductively coupled plasma atomic emission spectrometry(ICP-AES)was estab-lished.The results showed that the fusion effect was good when the mass ratio of flux and sample was 5∶1.The extractant of hydrochloric acid-tartaric acid could inhibit the hydrolysis of Ti and Zr.The matrix matching method was used to draw the calibration curve to eliminate the influence of matrix effect.The lin-ear correlation coefficients of calibration curves for 14 components were all above 0.999,and the limits of detection were in the range of 0.32-39.27 μg/g.The certified reference material of soil for composition a-nalysis(GBW07402)was determined according to the experimental method,and the found results of each component were basically consistent with the certified values.The relative errors(RE)were in the range of-0.43%-1.88%,and the relative standard deviations(RSDs,n=6)were in the range of 0.05%-3.7%.The proposed method was applied to the analysis of soil sample,and the RSDs(n=6)of the measurement results were between 0.15%and 6.2%.