阳离子交换树脂分离-电感耦合等离子体发射光谱(ICP-OES)法测定盐湖卤水中偏硅酸含量  

Determination of Metasilicic Acid Content in Salt Lake Brine by Inductively Coupled Plasma Optical Emission Spectrometry with Cation Exchange Resin Separation

作　　者：王洋 张露露[3] 王木荣 徐红印 张延芳 WANG Yang;ZHANG Lulu;WANG Murong;XU Hongyin;ZHANG Yanfang(Geological Research Institute of China Chemical Geology and Mine Bureau,Beijing 100101,China;College of Science,Hebei Agricultural University,Baoding,Hebei 071001,China;School of Chemistry and Chemical Engineering of Lanzhou Jiao Tong University,Lanzhou,Gansu 730000,China;Qinghai Salt Lake Industry Co.,Ltd.,Golmud,Qinghai 816000,China)

机构地区：[1]中化地质矿山总局地质研究院,北京100101 [2]河北农业大学理学院,河北保定071001 [3]兰州交通大学化学化工学院,兰州730000 [4]青海盐湖工业股份有限公司,青海格尔木816000

出　　处：《中国无机分析化学》2023年第8期857-862,共6页Chinese Journal of Inorganic Analytical Chemistry

基　　金：青海省科技计划项目(2021-ZJ-773)。

摘　　要：由于盐湖卤水中盐分浓度不同且盐度较高,采用常规分析方法很难准确测定。通过对阳离子交换树脂加入量、阳离子交换树脂交换时间、pH值对交换效率的影响、内标元素校正的考察,建立了阳离子交换树脂分离-电感耦合等离子体发射光谱法测定盐湖卤水中偏硅酸含量的方法。将盐湖卤水稀释5倍,加入6 g阳离子交换树脂,静态交换1.5 h,除去卤水中的大量阳离子后,选择Si 251.611 nm为分析谱线,以Y 371.030 nm谱线作为内标进行信号漂移校正,用电感耦合等离子体发射光谱仪能有效测定卤水中偏硅酸的含量。结果表明,校准曲线的线性范围为0.50~200 mg/L,所得回归方程的线性关系良好(r≥0.9994),检出限为0.16 mg/L,结果相对标准偏差(RSD,n=12)为1.8%~4.6%,加标回收率为96.3%~102%。同时采用紫外-可见分光光度法对偏硅酸含量进行方法比对,两种测试结果不存在显著性差异,表明所建立的方法具有良好的准确度。为提高盐湖资源的综合利用提供了可靠的数据支撑。Due to the different concentration and high salinity of salt in salt lake brine,it is difficult to determine accurately by conventional analysis methods.By investigating the addition amount of cation exchange resin,the exchange time of cation exchange resin,the influence of pH value on exchange efficiency,and the correction of internal standard elements,the determination of metasilicate in salt lake brine by cation exchange resin separation and inductively coupled plasma emission spectrometry was established.In this method,salt lake brine is diluted five times,6 g cation exchange resin is added,and the static exchange is 1.5 h.After removing a large number of cations in the brine,Si 251.611 nm is selected as the analytical spectral line,and Y 371.030 nm spectral line is used as the internal standard for signal drift correction.The content of metasilicic acid in the brine is determined by inductively coupled plasma emission spectrometer.The calibration curve is tested under the optimum conditions,and the linear range of the calibration curve is 0.50—200 mg/L,and the linear relationship of the regression equation obtained is good(r≥0.9994).The detection limit of this method is 0.16 mg/L,the relative standard deviation(RSD,n=12)is 1.8%—4.6%,and the recovery of standard addition is 96.3%—102%.At the same time,UV-visible spectrophotometry is used to compare the content of metasilicic acid,and there is no significant difference between the two test results,indicating that the method has good accuracy.Through this method,the content of metasilicic acid in salt lake brine can be determined quickly and accurately,providing reliable data support for improving the comprehensive utilization of salt lake resources.

关 键 词：阳离子交换树脂 电感耦等离子体发射光谱仪 盐湖卤水 偏硅酸 

分 类 号：O657.31[理学—分析化学] TH744.11[理学—化学]