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目的:建立测定中药材中硝酸盐含量的方法。方法:中药材中的硝酸盐经提取、石墨化炭黑柱净化后,用硝酸盐自动还原装置还原,测定其含量。结果:线性范围在0～400μg·L~(-1)之间,r=0.9989,检出限为0.86g·L~(-1),平均回收率为94.93%,RSD=2.1%(n=6)。结论:该测定方法快速、准确、灵敏,可作为中药材中硝酸盐残留的测定方法。
Objective: To establish a method for the determination of nitrate content in Chinese herbal medicines. Methods: Nitrate was extracted from Chinese herbal medicines and purified with graphitized carbon black column. The contents of nitrate were determined by automatic nitrate reduction. Results: The linear range was between 0 and 400 μg · L -1, the detection limit was 0.86 g · L -1, the average recovery was 94.93% and RSD was 2.1% (n = 6). Conclusion: The method is rapid, accurate and sensitive and can be used as a method for determination of nitrate residues in Chinese herbal medicines.