湿式催化消解-原子吸收法测定玉红膏中汞含量

Determination of mercury content in Yuhong ointment by wet catalytic digestion-atomic absorption spectrometry

目的:建立玉红膏中汞的含量测定方法。方法:采用湿式催化消解法对玉红膏进行前处理,氢化物发生-冷原子吸法收测定汞含量。结果:汞在2～20μg.L-1线性关系良好,加标回收率平均为104.27%,RSD 3.37%,样品重复测定的RSD 8.4%,测得不同批次玉红膏中的汞质量分数为0.7～1.5 mg.g-1。结论:该方法准确度高,重复性好,操作较为简便,可作为玉红膏中汞含量的质量控制方法。

Objective： To develop a method for determining the content of mercury contained in Yuhong ointment. Method： The wet catalytic digestion method was adopted for the pretreatment, and the mercury content in Yuhong ointment was determined by hydride generation-atomic absorption spectrometry （HG-AAS）. Result： The mercury showed a good linear relation in the range from 2 to 20 ug. L-1 , with the average recovery of 104. 27% and RSD of 3.37%. The RSD for real sample repeated measurement was determined to be 8. 4%. The mercury content in Yuhong ointment was detected in range from 0. 7 to 1.5 mg . g-1. Conclusion： The proposed method is accurate, highly reproducible and it can be used to control mercury content of Yuhong ointment.