X射线荧光光谱法测定土壤和水系沉积物中碳和氮等36个主次痕量元素

Determination of 36 Major,Minor and Trace Elements in Soil and Stream Sediment Samples by X-Ray Fluorescence Spectrometry

采用低压聚乙烯镶边垫底的粉末样品压片制样,用ARL ADVANT’XP+型X射线荧光光谱仪对土壤和水系沉积物样品中C、N、Na2O、MgO、A l2O3、SiO2、P、S、C l、K2O、CaO、Sc、Ti、V、Cr、Mn、Fe、Co、N i、Cu、Zn、Ga、Nb、Zr、Y、Sr、Rb、Pb、Th、Ba、As、Br、Hf、La、Ce和Nd等36个组分进行测定。重点研究了C、N等元素的测定条件和痕量元素的背景选择和谱线重叠校正问题。使用经验系数法和康普敦散射作内标校正基体效应。经标准物质校验,结果与标准值吻合。方法的检出限、精密度和准确度能满足多目标地球化学调查样品的分析要求。用GBW 07404土壤国家标准物质进行测试,12次重复测定的精密度(RSD),除N和C l<11.0%,其余各组分均<6.0%。

A method for the determination of C, N, Na2O, MgO, Al2O3, SiO2, P, S, Cl, K2O, CaO, So, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Nb, Zr, Y, Sr, Rb, Pb, Th, Ba, As, Br, Hf, La, Ce and Nd in soil and stream sediment samples by X-ray fluroescence spectrometry with pressed power pellet sample preparation was developed. The determination condition for C and N was optimized and the interference from background and spectra overlap was discussed. The matrix effect was corrected by experience coefficients and scattered radiation was used as internal standard for trace elements deterimination. The accuracy of the method was evaluated by analysis of certified reference soil samples. The results were in good agreement with centified values with precision of 〈6.0% RSD（n =12） expect for N and Cl （RSD 〈11.0%）.