基于CCD检测器的便携式液体阴极辉光放电光谱仪快速测定卤水中的锂（英文）

发布时间：2018-07-09 13:50

本文选题：便携式 + 液体阴极辉光放电　；参考：《光谱学与光谱分析》2017年03期

【摘要】：锂是绿色能源和轻质合金的理想材料,作为一种重要的战略资源而备受各国重视。锂主要来源于盐湖卤水,我国盐湖卤水资源丰富,但主要分布在西部偏远地区,现场勘探和开采急需便携分析仪器的支持,然而目前现有实验分析技术均达不到野外现场分析的目标。近十年来,基于大气压液体阴极辉光放电光谱仪(SCGD-AES)因无需燃气,载气等气流条件及真空环境而受到关注。在前人研究基础上,自行开发了基于CCD光谱仪检测系统的便携式大气压液体阴极辉光放电光谱仪(简称Li-K分析仪),仪器长,宽,高分别为35,19和27 cm,重约为10 kg,十分有利于便携。选择Li的分析谱线波长为670.78 nm,以取自西藏两种不同卤水水化学类型样品为研究对象,建立了卤水中Li的快速分析方法。在最佳工作条件下测得Li的检出限为4 ng·mL~(-1),方法的精密度(RSD)2%。研究表明,不同稀释倍数时,Li的分析结果与ICP-MS分析结果相差较大,这可能与溶液的基体效应有关,而采用标准加入法可有效减小基体效应的影响,获得了与ICP-MS较为一致的分析结果,可提高分析结果的准确度。大量实验结果表明,标准加入法只需2个点即可得到Li准确的分析结果,大大减少了实验工作量,为便携式Li-K分析仪在野外现场测定盐湖卤水中的Li奠定了方法学基础。
[Abstract]:Lithium is an ideal material for green energy and light alloy. Lithium mainly comes from brine of salt lake. The brine resource of salt lake in China is abundant, but mainly distributed in the remote area of the west, so the field exploration and exploitation need the support of portable analysis instrument. However, the existing experimental analysis techniques do not reach the goal of field analysis. In recent ten years, liquid cathodic glow discharge spectrometer (SCGD-AES) based on atmospheric pressure has attracted much attention because of gas free, carrier gas and vacuum environment. On the basis of previous studies, a portable liquid cathode glow discharge spectrometer (Li-K analyzer) based on CCD spectrometer is developed. The instrument is of length, width and height of 35.19 cm and 27 cm respectively, and its weight is about 10 kg, which is very convenient for portability. A rapid method for the determination of Li in brine was established by using two samples of different brine chemical types from Tibet at a wavelength of 670.78 nm. The detection limit of Li was 4 ng mL ~ (-1) under the optimum working conditions, and the precision (RSD) of the method was 2%. The results show that the results of Li analysis with different dilution times differ greatly from those of ICP-MS analysis, which may be related to the matrix effect of solution, and the effect of matrix effect can be effectively reduced by standard addition method. The analytical results are consistent with those obtained by ICP-MS, and the accuracy of the analytical results can be improved. A large number of experimental results show that the standard addition method only needs 2 points to obtain the accurate analysis results of Li, which greatly reduces the experimental workload, and lays a methodological foundation for the field determination of Li in salt lake brine by portable Li-K analyzer.
【作者单位】：国家地质实验测试中心;
【基金】：the Special Scientific Research Fund of Ministry of Land and Resources of China(201311013) Fundamental Research Funds of Chinese Academy of Geological Sciences(CSJ201607) the large resource investigation project of China(12120113091000)
【分类号】：TS312;O657.3

【相似文献】