ICP-AES法测定12个产地两面针药材中重金属元素的含量

目的:对广西12个不同产地两面针药材中6种重金属元素进行含量测定。方法:通过HNO3-HClO4硝解体系,彻底有效地硝解样品中的有机物,应用电感耦合等离子体原子发射光谱法(ICP-AES)测定As、Cr、Hg、Ni、Cd、Pb重金属含量。结果:建立了高效、简单、准确的实验方法,建立的各元素回归方程线性关系良好,相关系数在0.9993～1之间,加样回收率为90.82%～101.21%,RSD均小于3.0%。结论:各产地中药两面针的重金属元素含量有差异,As、Cr和Hg未检出;除南宁市产地外,11个产地Pb含量均符合药用和出口标准,但Cd含量均超过药用和出口标准。

Determination of six heavy metal elements in Zanthoxylum nitidum in twelve habitats of guangxi by ICP-AES

Objective: To determine the contents of six heavy metal elements in traditional Chinese medicine of Zanthoxylum nitidum in twelve habitats by ICP-AES.Methods: Nitric acid-perchloric acid mixed acid digested system was used to completely decomposed the organic compounds effectually.The As、Cr、Hg、Ni、Cd and Pb were determined by the absorption spectroscopy under set up working conditions.Results: An efficient,simple and accurate method was established.The recoveries were 90.82%～101.21% and RSDs were within 3.0%.Conclusion:The contents of six heavy metal elements are different in Zanthoxylum nitidum from different habitats.As,Cr and Hg were not detected.The content of Pb which from eleven habitats is consistent with the standards of medicine and export except from Nanning habitats,meanwhile the content of Cd all exceeds those standards.