中药材及饮片中三种亚硫酸盐残留量测定法的比较研究

Three Determination Methods for Residual Sulfite in Traditional Chinese Medicinal Materials and Pieces

目的:采用碘滴定法、酸碱滴定法、离子色谱法分别测定经硫磺熏蒸处理过的药材或饮片中亚硫酸盐的残留量,对三种方法进行比较。方法:采用三种方法,分别测定党参、山药、牛膝、白术四种中药,并进行回收试验,比较分析结果。总结各方法的特点和分析质量控制的基本要求。结果:碘滴定法和酸碱滴定法操作简单、成本低但干扰因素较多,因原理不同,适于不同品种药材测定。离子色谱法灵敏度高、专属性强但成本较高。结论:建议结合实际情况,选择适当方法进行二氧化硫残留量测定。

Objective：To determine residual sulfite in traditional Chinese medicinal materials or pieces processed by sulfur fumi-gation respectively by iodine titration, acid-base titration and ion chromatography and compare the results. Methods：The three meth-ods were used to determine four kinds of Chinese herbal medicines including Codonopsis radix, Dioscoreae rhizoma, Achyranthis bident-atae Radix and Atractulodis Macrocephalae Rhizoma, the recovery tests were also performed and the results were analyzed and compared to summarize the characteristics and quality control requirements of each method. Results：Iodine titration and acid-base titration had the advantages of simple operation process and low cost. However, there were many interference factors in the two methods, and due to different principles, they were suitable for the determination of different varieties of herbal medicines. Ion chromatography method had the advantages of high sensitivity and strong specificity, while the cost was high. Conclusion： It is suggested that proper methods should be chosen for the determination of sulfur dioxide residues according to actual situations.