波长与能量色散复合式X射线荧光光谱仪特性研究及矿区土壤分析

发布时间：2017-12-28 02:22

本文关键词：波长与能量色散复合式X射线荧光光谱仪特性研究及矿区土壤分析　出处：《光谱学与光谱分析》2017年07期 　论文类型：期刊论文

【摘要】：波长与能量色散(WD-ED)复合式X射线荧光(XRF)光谱仪是一型国际上新近研发的XRF光谱仪。该研究比较了此型光谱仪的特性,建立了联用分析方法,并用不确定度对所建方法进行了评估,证明WDEDXRF复合型光谱仪及其所建分析方法可用于土壤样品中主、次、痕量元素定量测定,并兼具了WD和ED各自的优点。研究表明:(1)对土壤质量和生态环境评价中具有重要意义的Mg,Al,P和K等元素,因WDXRF对轻元素具有更高灵敏度,故采用该型光谱仪和所建方法,可弥补单一采用ED方法的不足,从而为土壤质量和生态环境评价提供了更为灵敏和准确可靠的分析技术手段;(2)在本方法实验条件下,采用WDXRF测定,主元素Na2O,MgO,Al2O3,P2O5,K2O的检出限优于EDXRF,而SiO2,SO3,CaO,MnO,Fe2O3则是由EDXRF测定的检出限更优。对于谱线重叠较严重的微量元素,多数情况下WDXRF的检出限更低;(3)对主元素而言,总体上K及其原子序数之前的轻元素WDXRF准确度更好,Ca及其之后的元素EDXRF准确度更好。然而,由WDXRF和EDXRF获得的准确度也与样品相关,在某些情况下,EDXRF测定K的准确度会更好。微量元素和重叠干扰比较大的元素,采用分辨率好的WDXRF可获得更好的准确度;对于受其他元素谱线重叠影响较小的元素,EDXRF给出的结果准确度更好;(4)选用添加石蜡粘结剂的粉末压片法,利用该方法制成的地质样品粉末压片结实、无脱落,未观察到掉渣、掉粉现象,且分析准确度和精密度良好;(5)利用所建立的WD-EDXRF方法测定了采自集中开采矿区和附近河流及河漫滩沉积物,揭示矿区表层土含有较高浓度的Cu,Pb和Zn,可为找矿提供指示信息;(6)进行了矿区周边农田土壤分析,获得了元素分布趋势图,揭示矿集区附近农田土壤Pb和As等浓度较高,需要采取必要的生态与环境保护措施,以减小和避免对于人类健康的潜在影响。
[Abstract]:The wavelength and energy dispersive (WD-ED) composite X ray fluorescence (XRF) spectrometer is a newly developed XRF spectrometer. The study compared the characteristics of this type of spectrometer, an analytical method combined with, and the uncertainty of the method was evaluated and proved that WDEDXRF composite type spectrometer and the analysis method can be used in soil samples, and quantitative determination of trace elements, and has the advantages of WD and ED respectively. Research shows that: (1) has important significance on soil quality and ecological environment evaluation in Mg, Al, P and K elements, because WDXRF has higher sensitivity to light elements, so the use of the spectrometer and the method, can make up for the deficiency of single ED method, so as to soil quality and ecological environmental assessment provides a more sensitive and accurate analysis techniques; (2) in the experimental conditions, the determination of the main elements of WDXRF, Na2O, MgO, Al2O3, P2O5, the detection limit is better than that of EDXRF, K2O and SiO2, SO3, CaO, MnO, Fe2O3 were measured by EDXRF detection limit better. For most trace elements with more overlapping spectra, the detection limit of WDXRF is lower in most cases. (3) for the main elements, in general, the accuracy of light element WDXRF before K and its atomic number is better, and the accuracy of Ca and its element EDXRF is better. However, the accuracy obtained by WDXRF and EDXRF is also related to the sample. In some cases, the accuracy of EDXRF for the determination of K will be better. The trace elements and the overlap interference is relatively large, with good resolution of WDXRF can obtain better accuracy; for smaller elements from other elements of spectral overlap, EDXRF results are accurate and better; (4) the powder method adding wax based binder, geological sample powder made by using this method is strong No, shedding was observed, and the dregs powder out phenomenon, analysis of good accuracy and precision; (5) collected from centralized mining areas and nearby rivers and floodplain sediments were determined by the WD-EDXRF method, reveal the mining area surface soil containing high concentrations of Cu, Pb and Zn, can provide information indicating for ore prospecting; (6) analyzed the mining area surrounding agricultural soil, elements distribution trend chart was obtained, revealing ore district near the soil Pb and As concentration is high, need to take the necessary ecological and environmental protection measures, in order to Reduce and avoid the potential impact on human health.
【作者单位】：国家地质实验测试中心;中国地质大学(武汉)材料与化学学院;
【基金】：国家重点研发计划项目(2016YFC0600603) 国家自然科学基金青年科学基金项目(41201527);国家自然科学基金项目(20775018) 中国地质调查项目(DD20160340)资助
【分类号】：O657.34;X833
【正文快照】： 2.中国地质大学(武汉)材料与化学学院,湖北武汉430074引言随着近年来对矿产资源需求日益增加,我国的矿产开发总规模已居世界第三,很多矿产资源的不合理地开发和利用,已对矿山及其周围环境造成严重污染,最典型的就是矿区周边土壤中有害元素严重超标,继而带来食品安全问题,甚至

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