X射线荧光光谱法测定高铝耐火材料中氧化铝的测量不确定度评定
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2020年 2月上 世界有色金属157化学化工C hemical EngineeringX 射线荧光光谱法测定贵金属含量的不确定度评定彭小悦1,2,代泳波1,2,张文怡1,2,徐杰明1,2(1.常德市产商品质量监督检验所,湖南 常德 415200;2.湖南省珠宝玉石饰品产品质量监督检验中心,湖南 常德 415200)摘 要:依据GB/T18043-2013对金项链含金量进行测定,考虑标准物质、测量重复性、样品均匀性、标准曲线线性等因素对X射线荧光光谱法测定贵金属含量的不确定度进行评定,结果表明测量重复性所产生的不确定度所占分量最大。
本文采用的评定方法,能够广泛运用到贵金属含量检测。
关键词:X射线荧光光谱仪;贵金属;不确定度评定中图分类号:TS934.3 文献标识码:A 文章编号:1002-5065(2020)03-0157-2Evaluation of Uncertainty in Determination of Noble Metal Content by X-ray Fluorescence SpectrometryPENG Xiao-yue 1,2, DAI Yong-bo 1,2, ZHANG Wen-yi 1,2, XU Jie-ming 1,2(1.Changde City Product Quality Supervision and Inspection Institute, Changde 415200, China;2.Hunan Provincial Quality Supervision and Inspection Center for Jewelry, Jade, and Ornament Products, Changde 415200, China)Abstract: The gold content of gold necklaces was determined according to GB / T18043-2013, and the uncertainty of the determination of precious metal content by X-ray fluorescence spectrometry was evaluated in consideration of standard materials, measurement repeatability, sample uniformity, and standard curve linearity. Uncertainty due to measurement repeatability has the largest component. The assessment method used in this paper can be widely used for the detection of precious metal content.Keywords: X-ray fluorescence spectrometer; precious metal; uncertainty evaluation在经济不断发展的当今社会,人们的生活方式和生活追求发生着翻天覆地的变化,越来越多的人开始关注奢侈品,珠宝玉石这个行业正在不断地飞快的崛起。
X射线荧光光谱法测定萤石中氟化钙、二氧化硅、氧化铝、全铁的含量李韶梅;杜彩霞;张慧娟【摘要】应用X射线荧光光谱法(XRFS)测定了萤石中氟化钙、二氧化硅、氧化铝和全铁的含量。
采用熔融法制备样块,称取粒径小于0.125mm的试样1.000g于铂坩埚中与硝酸钾0.2g、碳酸锂1.0g及无水四硼酸锂5.0g混合均匀,加入150g·L^-1溴化锂溶液3滴,于1050℃熔融20min,所得熔块用XRFS对上述4种组分进行测定。
对含有还原性物质的试样采用先在铂坩埚中加入无水四硼酸锂熔融,使熔剂均匀粘涂于坩埚内壁的下部和底部,冷却后再用硝酸钾及碳酸锂按程序在低温预氧化后升至高温对样品进行熔融,所得熔块用于XRFS分析,用标准样品按试验方法制备工作曲线。
应用此法分析了4个萤石样品,上述组分的测定值与化学法的测定值相符。
%Contents of CaF2, SiO2, Al2O3 and total iron (TFe) in fluorspar were determined by XRFS. Cube samples for XRFS determinations were prepared by fusion. 1. 000 g (size ca. 0. 125 mm) of the sample was mixed thoroughly with KNO3 (0. 2 g), Li2CO3 (1.0 g) and Li2B4O7 (5.0 g) in a Pt crucible, and after addition of 3 drops of 150 g · L^-1 LiBr solution, the mixture was fused at 1 050 ℃ for 20min. The melt after cooling to room temperature was used for determination of the 4 components by XRFS. For samples containing reductive substances, the fusion process should be modified. Li2NO7 should be added to the Pt crucible to have the melt coated on the inner wall of the crucible at lower, and botton parts. After cooling, KNOa and Li2 CO3 were added to the crucible, after pre-oxidation at programmed lowtemperatures, fusion of the sample was performed as above. The melt was used for determination of the 4 components. Working curves were prepared by using standard samples. Four fluorspar samples were analyzed by the proposed method, giving results in consistency with the results found by chemical methods.【期刊名称】《理化检验-化学分册》【年(卷),期】2011(047)010【总页数】3页(P1162-1164)【关键词】X射线荧光光谱法;萤石;熔融法;氟化钙;二氧化硅;氧化铝;全铁【作者】李韶梅;杜彩霞;张慧娟【作者单位】河北钢铁集团邯钢技术中心,邯郸056015;河北钢铁集团邯钢技术中心,邯郸056015;河北钢铁集团邯钢技术中心,邯郸056015【正文语种】中文【中图分类】O657.34萤石是一种重要的非金属矿物原料,在钢铁工业中用作炼铁、炼钢的熔剂,降低冶炼温度和炉渣黏度。