超声辅助分离富集-催化极谱法测定中草药中痕量镉  

Polarographic determination of trace cadmium in Chinese herbs with ultrasonication assistant for separation and enrichment

作　　者：蒋翠文[1] 蔡卓[1] 叶丹妮[1] 岳伟超[1] 

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2015年第3期514-518,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：广西自然科学基金资助项目(2010GXNSFA013001);广西大学实验设备处科研项目(20120301)

摘　　要：针对中草药中重金属镉含量较低,不易直接测定的问题,本文提出了以巯基棉在超声辅助条件下分离富集,催化极谱法测定中草药中痕量镉的新方法.研究发现,在超声辅助下巯基棉对草药中痕量镉具有良好的吸附作用,被吸附的镉可用醋酸和磷酸分步定量洗脱,基于此建立了超声辅助巯基棉分离富集中草药中痕量镉的方法.在最佳条件下,巯基棉对镉的富集因子为8,方法检出限为0.52 ng/mL,加标回收率为97.1%ц102%,将该方法用于麦冬和鱼腥草中痕量镉的测定,结果满意.Directly determination of cadmium in chinese herbs is very difficult due to its low con-tent. To solve this problem, a method for determination of trace cadmium in Chinese herbs by cata-lytic polarography after separation and enrichment using sulfhydryl cotton with ultrasonication assis-tant was present. It was found that sulfhydryl cotton was of good performance in adsorption of trace cadmium in herbal medicine with ultrasonication assistant;the absorbed cadmium could be quantita-tively eluted from sulfhydryl cotton using acetic acid and phosphoric acid, respectively. Based on this, a new method for catalytic determination of trace cadmium in Chinese herbs was proposed. Un-der the optimum experimental conditions, the enrichment factor was 8 after separation and enrich-ment with ultrasonication assistant and using sulfhydryl cotton. The detection limit was 0. 52 ng/mL, standard addition recovery is 97. 1% ц97. 1%. This method was used to determination of trace cad-mium in ophiopogon and cordate houttuynia with satisfactory results.

关 键 词：超声辅助 巯基棉 催化极谱法 镉 中草药 

分 类 号：O657.39[理学—分析化学]