原子吸收法间接测定石膏矿中氯离子
欧阳泉根,黄龙
核工业二八〇研究所,四川广汉 618300
Indirect determination of chloride ion in gypsum ore by atomic absorption spectrometry
OUYANG Quangen, HUANG Long
Research institute No. 280, CNNC, Guanghan 618300, China
摘要:采用原子吸收法间接测定石膏矿中的氯离子。针对原子吸收法中S2-、Br-、I-共存离子干扰、微量氯离子中氯化银溶解度干扰及氯化银胶体沉淀难题等进行了探讨。用过氧化氢加热法加去除S、Br、I共存离子干扰;用氯化银溶度积来矫正溶液中的氯离子,减小了微量氯离子的检测误差;石膏矿中存在的大量硫酸钙可做为絮凝剂。银离子的质量浓度在0~10.0μg/mL范围内与吸光度具有良好的线性关系,线性相关系数为0.999 8。石膏矿中氯离子测定结果的相对标准偏差为1.2%~4.2%(n=11)。用该方法测定石膏成份分析国家标准物质,测定结果与标准值基本一致。该方法可用于测定石膏矿中的氯离子。
Abstract:The method of indirect determination of chloride ion in gypsum ore by atomic absorption spectrometry was established. The interference of S2-, Br- and I- coexisting ions, the interference of silver chloride solubility in trace chloride ions and the problems of colloidal precipitation of silver chloride were discussed. The interference of S2-, Br- and I- coexisted ions was removed by hydrogen peroxide heating method. The solubility product of silver chloride was used to correct the chloride ions in solution, and the detection error of trace chloride ions was reduced. A large amount of calcium sulfate in gypsum ore was used as ?occulant. The mass concentration of silver ion had a good linear relationship with the absorbance in the range of 0-10.0 μg/mL, and the linear correlation coe ?cient was 0.999 8. The relative standard deviation of chloride ion determination results in gypsum ore was 1.2%-4.2% ( n=11). The method was used to determine the national standard substance for gypsum composition analysis, and the result was basically consistent with the standard value. The method can be used to determine chloride ion in gypsum ore.
关键词:原子吸收法;氯离子;安全环保;过氧化氢;石膏矿
Keywords:atomic absorption method; chloride ion; safety and environmental protection; hydrogen peroxide;gypsum ore
本文引用格式:
欧阳泉根,黄龙.原子吸收法间接测定石膏矿中氯离子[J].化学分析计量,2022,31(4):40.
OUYANG Quangen,HUANG Long. Indirect determination of chloride ion in gypsum ore by atomic absorption spectrometry[J]. Chemical analysis and meterage,2022,31(4):40.
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