不同消解对原子吸收光谱法测定三七中重金属铬的影响  

Effects of Different Digestion Methods on Determination of Heavy Metal Cr in Panax pseudo-ginseng var.notoginseng by AAS

作　　者：王宝森[1,2] 刘贵阳[1,2] 刘卫[1,2] 付开林[1,2] 董云文[1,2] 

机构地区：[1]红河学院理学院,云南省蒙自市661100 [2]云南省天然药物与化学生物学重点实验室,云南省蒙自市661100

出　　处：《光谱实验室》2012年第3期1399-1402,共4页Chinese Journal of Spectroscopy Laboratory

基　　金：国家公益性行业科研专项项目(200810998)

摘　　要：以云南文山三七为材料,分析研究了用干法灰化、湿法消解前处理样品对原子吸收光谱法测定三七中重金属C r含量的影响,方法的相关系数为0.9993,干法灰化回收率为95.02%,湿法消解回收率为93.03%,分析结果满意。结果表明,干法灰化的最佳条件为灰化温度500—600℃、灰化时间6—8h。湿法消解的最佳消解体系为HNO3:HC lO4(V/V)=4:1体系。用干法灰化或常压下湿法消解处理样品,原子吸收光谱法可以准确测定三七中重金属C r含量,且方法简单、快捷。云南文山三七粉中重金属C r含量为1.8178μg/g。The content of heavy metal Cr in Panax pseudo-ginseng var.notoginseng from Wenshan,Yunnan Province was determined by atomic absorption spectrometry（AAS）.The effects of the two pre-treatments,dry ashing method and wet digestion method,on the Cr content determination were studied.The correlation coefficient of the method was 0.9993.The recovery of dry ashing method was 95.02%,while the recovery of wet digestion method was 93.03%.The results suggested that the optimum condition for the dry ashing method was at 500—600℃ for 6—8h,and that for the wet digestion method was HNO3∶HClO4（V/V）=4∶1 digestion system.The content of Cr in Panax pseudo-ginseng var.notoginseng can be determined accurately by AAS via the pre-treatment of dry ashing method or wet digestion method at ambient pressure,and both methods are simple and rapid.The content of heavy metal Cr in Panax pseudo-ginseng var.notoginseng from Wenshan,Yunnan Province is 1.8178μg/g.

关 键 词：干法灰化 湿法消解 原子吸收光谱法 三七 铬 

分 类 号：O657.31[理学—分析化学]