便携式Li-K分析仪的研制及其在锂辉石中锂的分析应用

我国锂钾主要矿产资源大多分布在西部偏远地区,其勘查找矿或综合利用迫切需要现场快速分析技术的支持。本文介绍了自行开发的便携式Li-K分析仪的主要性能及其在锂辉石中锂的分析应用。Li-K分析仪是一种基于大气压的液体阴极辉光放电光谱仪,以待测液体为放电阴极,实现了样品中Li、K等元素的原子化和激发。该仪器以光纤传导CCD光谱仪作为检测器,其波长范围为345-1015 nm,分辨率3 nm;以Li 670.78 nm和K 769.90 nm分析谱线,在仪器最佳工作条件下测定Li、K的精密度（RSD,n=14）均低于2%,检出限为0.03μg/m L,检测范围0.1-10μg/m L。研究表明,不同酸度...

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Bibliographic Details
Published in岩矿测试 Vol. 35; no. 4; pp. 366 - 372
Main Author 焦距 杨啸涛 袁继海 樊兴涛 刘晓 詹秀春
Format Journal Article
LanguageChinese
Published 国家地质实验测试中心,北京,100037 2016
Subjects
CCD光谱仪
便携式Li-K分析仪
标准加入法
液体阴极辉光放电
锂辉石
standard addition method
solution cathode atmospheric glow discharge
portable Li-K analyzer
charge coupled device (CCD)
CCD光谱仪
液体阴极辉光放电
标准加入法
便携式Li-K分析仪
锂辉石
spodumene
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Summary:我国锂钾主要矿产资源大多分布在西部偏远地区,其勘查找矿或综合利用迫切需要现场快速分析技术的支持。本文介绍了自行开发的便携式Li-K分析仪的主要性能及其在锂辉石中锂的分析应用。Li-K分析仪是一种基于大气压的液体阴极辉光放电光谱仪,以待测液体为放电阴极,实现了样品中Li、K等元素的原子化和激发。该仪器以光纤传导CCD光谱仪作为检测器,其波长范围为345-1015 nm,分辨率3 nm;以Li 670.78 nm和K 769.90 nm分析谱线,在仪器最佳工作条件下测定Li、K的精密度（RSD,n=14）均低于2%,检出限为0.03μg/m L,检测范围0.1-10μg/m L。研究表明,不同酸度和酸的类型对谱线强度影响较大,且存在显著的样品基体效应,标准曲线法分析锂辉石中Li的结果偏差高达267%;而标准加入法可克服基体效应的影响,获得与ICP-OES一致性较好的分析结果,为现场开展固体样品中Li的测定奠定了基础。
Bibliography:Most of the mineral resources of lithium and potassium are distributed in remote western China. Fast,on-site analytical techniques are urgently needed for their exploration and comprehensive utilization. In this work,a newly developed portable Li-K analyzer was introduced for its analytical performance and the application of this equipment in determining lithium in spodumene is also discussed. The analyser is a type of atomic emission spectrometer based on solution cathode atmospheric glow discharge. Sample solution was used as a graphite cathode,which atomized and excited the elements Li and K. A charge coupled device（ CCD） was used to detect the characteristic lines of Li and K,which had wavelengths ranging from 345 to 1015 nm with a 3 nm resolution.Using a Li analytical line of 670. 78 nm and a K analytical line of 769. 90 nm under the optimized working conditions,the measurement precisions for Li and K were greater than 2% RSD with the limit of detection of 0. 03μg / m L. Results show that different types
ISSN:0254-5357
DOI:10.15898/j.cnki.11-2131/td.2016.04.005