直接粉末进样-能量色散X射线荧光光谱法测定地质样品中多种组分

发布时间：2018-05-17 03:07

本文选题：能量色散X射线荧光光谱法(EDXRF) + 地质样品　；参考：《冶金分析》2017年03期

【摘要】：为提高现场快速分析的能力,充分发挥小型实验室设备的功能,实验采用能量色散X射线荧光光谱仪,直接使用粉末样品分析常规地质样品中的多种组分。用理论α系数和康普顿内标校正基体效应和谱线重叠干扰,直接将粉碎加工到200目(74μm)的样品放在液体塑料盒中进行测量。对地质样品标准物质进行样品用量试验表明,样品用量大于3.0g时,测量结果趋于稳定或者在认定值的准确度控制范围内变动,实验时选取4.0g作为样品用量。精密度试验表明,除组分La、Ce、Sn、W、U和Na_2O的相对标准偏差(RSD,n=12)大于10%外,其他组分的RSD都小于10%,尤其是组分Ti、Mn、Co、Rb、Sr、SiO_2、K_2O、CaO和Fe_2O_3的RSD都在1%以下。通过对未参加回归的标准物质的验证,参照《地球化学普查(比例尺1∶50 000)规范样品分析技术要求补充规定》,该法对常规地质样品可定量分析Ti、V、Mn、Co、Ni、Cu、Zn、Ga、As、Rb、Sr、Y、Zr、Nb、Th、U、K_2O、CaO和Fe_2O_3等19种组分,近似定量分析Ce和W,半定量分析Cr、La、Sn、SiO_2和Na_2O。由于将样品放入液体塑料盒中进行测量,无需压片制样设备,该法适合野外现场分析应用。
[Abstract]:In order to improve the ability of field rapid analysis and give full play to the function of small laboratory equipment, energy dispersive X-ray fluorescence spectrometer and powder sample are used directly to analyze various components in conventional geological samples. The matrix effect and spectral line overlapping interference were corrected by theoretical 伪 coefficient and Compton internal standard. The samples processed to 200 mesh / 74 渭 m) were directly measured in liquid plastic box. The sample dosage test of the geological sample standard material shows that when the sample dosage is more than 3.0 g, the measurement results tend to be stable or change within the accuracy control range of the determined value. In the experiment, 4.0 g is selected as sample dosage. The precision test shows that, except for the relative standard deviation (RSDN) of Na_2O and LaCe, the RSD of all other components is less than 10%, especially the RSD of RbSiO2SiO2SiO2OCaO and Fe_2O_3 are all less than 1%. Based on the verification of the standard materials not participating in the regression, and with reference to the Technical requirements for the Technical Analysis of the Standard samples of the Geochemical Survey (1:50 000), this method can be used to quantitatively analyze 19 components of the conventional geological samples, such as TiGV, MnCoC, NiCuZN, ZnGaAsN, RbGN, YB, YB, NbNb, Th, UK, O, Cao, Fe_2O_3, etc., and the results are as follows: (1) in this paper, the contents of the samples are as follows: 1. The quantitative analysis of ce and Wand the semi-quantitative analysis of Cr-LaSn-SiOSII and Na2O-2 were carried out in this paper. The method is suitable for field analysis because the sample is placed in a liquid plastic box for measurement and no tablet preparation equipment is needed.
【作者单位】：武警黄金第十二支队化验室;
【分类号】：P632;O657.34

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