基于水溶性探针法测镁的高纯碳酸锂快速质检  

Rapid quality inspection of high-purity lithium carbonate based on determination of magnesium by water-soluble probe method

作　　者：李岩 王岩松 成怀刚 康锦 李恩泽 吕宏洲 刘倩 LI Yan;WANG Yansong;CHENG Huaigang;KANG Jin;LI Enze;LÜHongzhou;LIU Qian(Institute of Resources and Environmental Engineering,Shanxi University,Taiyuan 030006,China;College of Chemistry and Chemical Engineering,Jinzhong University,Jinzhong 030619,China;School of Chemical Engineering,Qinghai University,Xining 810016,China;Shanxi Dadi Ecological Environment Technology(Research Institute)Co.,Ltd.,Taiyuan 030006,China)

机构地区：[1]山西大学资源与环境工程研究所,山西太原030006 [2]晋中学院化学化工系,山西晋中030619 [3]青海大学化工学院,青海西宁810016 [4]山西大地生态环境技术研究院有限公司,山西太原030006

出　　处：《无机盐工业》2023年第1期87-92,共6页Inorganic Chemicals Industry

基　　金：国家自然科学基金区域创新发展联合基金(U20A20149);山西省研究生教育创新项目(2021Y139,2021YJJG010);国家自然科学基金青年项目(21908137);青海省昆仑英才·高端创新创业人才(2021)。

摘　　要：碳酸锂生产过程及最终产品中,微量镁的掺杂会直接影响碳酸锂的产品品质及其下游产品的加工应用,而高纯碳酸锂中微量镁的快速检测仍是一个难点。研究提出利用水溶性荧光探针检测碳酸锂中微量镁的方法,以水溶性极强的三(羟甲基)氨基甲烷对2-(2-羟基苯基)苯并噁唑进行修饰,构建了具有高灵敏度和高选择性的水溶性Mg^(2+)荧光探针A。该方法可实现对碳酸锂溶液中Mg^(2+)的快速荧光检测,并确定了探针A被Mg^(2+)所激发的荧光信号强度与Mg^(2+)浓度之间的定量关系。结果表明在水溶条件下检测含镁杂质的碳酸锂时,该方法对微量镁的检出限为2.014 9μmol/L,检测工作曲线相关系数达到0.991 5,检测灵敏度高,对高纯碳酸锂中微量镁的检测时间为3.666 s,可实现对Mg^(2+)的快速质检。In the production process of lithium carbonate and the final product,the doping of trace magnesium will directly affect the product quality of lithium carbonate and the processing and application of downstream products,and the rapid detection of trace magnesium in high-purity lithium carbonate is still a difficulty.In this study,a method for detecting trace amounts of magnesium in lithium carbonate using a water-soluble fluorescent probe was proposed.The highly water-soluble tris(hydroxy) methyl aminomethane was used to modify 2-(2-hydroxyphenyl) benzoxazole.Water-soluble Mg^(2+)fluorescent probe A with high sensitivity and selectivity was constructed.This method could realize the rapid fluorescence detection of Mg^(2+)in lithium carbonate solution,and determine the quantitative relationship between the fluorescence signal intensity of probe A excited by Mg^(2+)and the concentration of Mg^(2+).The results showed that the detection limit of this method for trace magnesium was 2.014 9 μmol/L when the lithium carbonate containing magnesium impurities was detected under watersoluble conditions,and the correlation coefficient of the detection working curve reached 0.991 5,and the detection sensitivity was high.The detection time of magnesium was 3.666 s,which could realize the rapid quality inspection of Mg^(2+).

关 键 词：荧光探针 高纯碳酸锂 质检 水溶性 

分 类 号：TQ131.11[化学工程—无机化工]