粉末压片-波长色散X射线荧光光谱法测定金矿型构造叠加晕样品中18种次量元素

修凤凤; 樊勇; 李俊雨; 朱义杰

doi:10.15898/j.cnki.11-2131/td.201704170061

粉末压片-波长色散X射线荧光光谱法测定金矿型构造叠加晕样品中18种次量元素

Determination of 18 Minor Elements in the Structural Superimposed Halo Samples from Gold Deposits by Wavelength Dispersive X-ray Fluorescence Spectrometry with Pressed-powder Pellets

摘要

摘要: 金矿床型构造叠加晕样品中的砷锑铋银锡钨等金属元素含量对金矿多期次多阶段成矿具有指示意义。此类样品采集于金矿中，样品各元素含量范围大，从克吨级至百分之几，分布也不均匀。采用常规的检测方法分析时，存在元素间干扰不易消除、记忆效应严重等问题。本文建立了粉末压片-波长色散X射线荧光光谱法测定金矿型构造叠加晕样品中砷锑铋等18种次量元素的定量分析方法。通过研究角度扫描图，选择了干扰少、强度高的分析线；充分混匀样品，消除了偏析效应；选用与样品基体类似的国家标准样品建立工作曲线，通过数学校正和内标法校正了谱线重叠干扰和基体效应。方法检出限为0.14~2.23 μg/g，精密度（RSD，n=12）小于4%。本方法可快速、准确地测定金矿床型构造叠加晕样品中各元素的含量。

Abstract:
BACKGROUNDElements As, Sb, Bi, Ag, Sn, W, Mo, Cu, Pb, Zn, Co, Cr, Ni, Ti, V, Mn, Sr and Ba in structural superimposed halo samples of gold deposits were of significance to the multi-phases and multi-stage mineralization of the gold deposits. This kind of sample is collected in the gold mine. The content of each element is very different and the distribution is uneven, from the ppm level to a few percent.
OBJECTIVESTo overcome the problems of conventional detection methods, such as difficult to eliminate inter-element interference and serious memory effects.
METHODSThe contents of 18 elements in structural superimposed haloes of gold ore were studied by pressed-powder pellets Wavelength Dispersive XRF.
RESULTSBy studying the angle scanning chart, the analysis line with least interference and high intensity is selected, and the segregation effect is eliminated by fully mixing the sample. The detection limits of this method are 0.14-2.23 μg/g, and the precision (RSD, n=12) is less than 4%.
CONCLUSIONSThe method can rapidly and accurately determine the contents of all elements in structural superimposed halo samples of gold deposits.

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