2种滇产中药材中11个重金属的含量测定

Determination of heavy metal elements in two Chinese herbal medicines

采取混酸湿法消解及微波消解样品,利用原子荧光光谱法及原子吸收分光光度法测定含量.2药材重金属含量（mg/kg）分别为As：0.68,1.39,Pb：0.23,0.16,Cd：0.08,0.14,Ni：0.84,1.84,Cr：4.20,6.96,Fe：254.43,431.23,Mn：9.22,4.02,Cu：4.26,3.88,Zn：19.92,20.22,其中砷的检出限为0.054 3μg/L,2种中药材的砷的加标回收率分别为98.39%-107.72%、96.87%-104.98%.该方法操作简单、准确灵敏,为中药材中重金属含量测定提供了较好的方法.

This research adopted mixed acid（ nitric acid,perchloric acid and sulfuric acid） method and the microwave digestion to digest the samples,and used the atomic fluorescence spectrometry and atomic absorption spectrophotometry to determine their relevant contents. The detection limits are As： 0. 68,1. 39 mg / kg,Pb： 0. 23,0. 16 mg / kg,Cd： 0. 08,0. 14 mg / kg,Ni： 0. 84,1. 84 mg / kg,Cr： 4. 20,6. 96 mg / kg,Fe： 254. 43,431. 23 mg / kg,Mn：9. 22,4. 02 mg / kg,Cu： 4. 26,3. 88 mg / kg,Zn： 19. 92,20. 22 mg / kg,of which the content of As is 0. 03μg / L,the addition standard recovery rates of the content of As in two Chinese herbal medicines are 98. 39% —107. 72%,96. 87% —104. 98% respectively. This method is sample,precise and sensitive for the determination of the heavy metals in Chinese herbal medicines.