甲基橙分光光度法测定盐溶液中十八胺的含量  

Determination of octadecylamine in a salt aqueous solution by methyl orange spectrophotometry

作　　者：马亮 张思远 路淼 胡耀强[1,3] 张慧芳 马珍[4] 于雪峰 刘海宁 叶秀深 MA Liang;ZHANG Si-yuan;LU Miao;HU Yao-qiang;ZHANG Hui-fang;MA Zhen;YU Xue-feng;LIU Hai-ning;YE Xiu-shen(Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt Lakes,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China;University of Chinese Academy of Sciences,Beijing 101408,China;College of Ocean and Meteorology,Guangdong Ocean University,Zhanjiang 524088,China;Qinghai Salt Lake Industry Co.,Ltd.,Golmud 816000,China)

机构地区：[1]中国科学院青海盐湖研究所中国科学院盐湖资源综合高效利用重点实验室青海省盐湖资源化学重点实验室,青海西宁810008 [2]中国科学院大学,北京101408 [3]广东海洋大学海洋与气象学院,广东湛江524088 [4]青海盐湖工业股份有限公司,青海格尔木816000

出　　处：《应用化工》2023年第7期2244-2249,共6页Applied Chemical Industry

基　　金：国家自然科学基金项目(U20A20150);青海省“昆仑英才·高端创新创业人才”计划项目。

摘　　要：十八胺(ODA)是正浮选法生产氯化钾的常用捕收剂,如何快速准确测定浮选阶段样品中的十八胺含量对于高纯钾盐产品制备工艺的控制与优化至关重要。根据ODA在弱酸性环境中与甲基橙发生络合反应的性质,通过分析溶液中剩余甲基橙与ODA浓度关系,建立了盐溶液中ODA浓度快速测定的分光光度法。测定波长为463 nm,ODA浓度和吸光度的线性相关方程为A=-0.08656c+2.51726,线性相关系数R 2=0.99346,检出限为0.048 mg/L,相对标准偏差(RSD)在0.148%~0.297%之间。对钾肥浮选不同工段所得料浆的分析检测表明,加标回收率在99.65%~104.06%之间。本方法具有操作简单、灵敏度高、检测速度快、成本较低等优点,分析过程中无需使用大量有机试剂或酸碱试剂,可用于水溶液、正浮选各工艺阶段及钾盐产品中ODA含量的测定。Octadecylamine(ODA)is a commonly used collector in the production of potassium chloride by positive flotation.For control and optimization of the production process of high-purity potassium salt products,it is essential to rapidly and precisely determine the amount of ODA in the sample at the flotation stage.According to the complexation reaction between ODA and methyl orange in a weak acidic environment,the concentration of ODA in the solution was obtained by measuring the absorbance of the remaining methyl orange at a specific wavelength,and a spectrophotometric method for rapid determination of the concentration of ODA in salt solution was established.The determination wavelength is 463 nm,the linear correlation equation is A=-0.08656 c+2.51726,the linear correlation coefficient(R 2)is 0.99346,the detection limit is 0.048 mg/L,and the relative standard deviation(RSD)is 0.148%~0.297%.The analysis and testing of the slurry obtained in different sections of potassium fertilizer flotation indicate that the recovery rate of spiking is between 99.65%and 104.06%.This method benefits from the simple operation,high sensitivity,fast detection,and low cost.It can be used to determine the concentration of ODA in aqueous solutions,positive flotation process,and potassium salt products without the usage of a large amount of organic reagents during the analytical procedure.

关 键 词：十八胺 甲基橙 紫外-可见分光光度法 正浮选 氯化钾 

分 类 号：TQ443.1[化学工程—化学肥料工业] O661[理学—分析化学] O626[理学—化学] O657.32