红外吸收法测定碳酸镧和碳酸铈中不可吹扫有机碳

发布时间：2018-03-19 03:27

本文选题：红外吸收法　切入点：总有机碳分析仪　出处：《冶金分析》2017年08期 　论文类型：期刊论文

【摘要】：采用5mL盐酸将试样溶解完全,将氧气通入试液中进行吹扫,除去溶液中溶解的二氧化碳和易挥发性有机物后,将试液注入高温燃烧管中,在专用催化剂存在下进行热催化高温氧化反应,使有机碳转化成二氧化碳,用非色散红外检测器进行测定,建立了红外吸收法测定碳酸镧和碳酸铈中不可吹扫有机碳(NPOC)含量的方法。采用正交试验法选择了吹扫二氧化碳和易挥发有机物的最佳试液体积为25mL、吹扫时间为300s、试液pH值为1.0。NPOC校准曲线相关系数为0.999 9,线性关系良好,方法检出限为0.000 6%,方法的测定下限为0.001 9%。采用实验方法对碳酸镧和碳酸铈中NPOC进行测定,结果的相对标准偏差(RSD,n=11)小于5.0%,加标回收率在95%~104%之间。
[Abstract]:The sample was dissolved completely with 5 mL hydrochloric acid and the oxygen was blown through the test solution. After removing the dissolved carbon dioxide and volatile organic compounds in the solution, the test solution was injected into the high temperature combustion tube. In the presence of a special catalyst, the oxidation of organic carbon was carried out at high temperature, and the organic carbon was converted into carbon dioxide, which was determined by non-dispersive infrared detector. A method for the determination of NPOC in lanthanum carbonate and cerium carbonate by infrared absorption was established. The optimum volume and time of blowing carbon dioxide and volatile organic compounds were 25mL and 300s, respectively. The correlation coefficient of the calibration curve of pH 1.0.NPOC was 0.999 9, and the linear relationship was good. The detection limit of the method was 0.000 6 and the lower limit of the method was 0.001 9. The NPOC in lanthanum carbonate and cerium carbonate was determined by experimental method. The relative standard deviation (RSD) was less than 5.0%, and the recovery rate was between 95% and 104%.
【作者单位】：包头稀土研究院;瑞科稀土冶金及功能材料国家工程研究中心;白云鄂博稀土资源研究与综合利用国家重点实验室;
【分类号】：O657.3;TQ133.3

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