光谱学与光谱分析 |
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Studies on Six Heavy Metal Elements Dissolution Characteristics of Andrographis Herb by ICP-OES |
TANG Rui1, LI Tian-peng1, GU Xue-shi1, LI Yong-jian1, YANG Yi2* |
1. School of Pharmacology, Guangdong Pharmaceutical University, Guangzhou 510006, China 2. School of Science, Beijing University of Chemical Technology, Beijing 100029, China |
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Abstract A simple and accurate method for the simultaneous determination of As, Ba, Cd, Cr, Cu and Pb in andrographis herb by inductively coupled plasma optical emission spectrometry (ICP-OES) was developed. The samples were digested by HNO3-HClO4. The digestion-determination method was evaluated with the relative standard deviations for all these elements between 2.1% and 4.6%, and the recoveries were between 92.0% and 103.2%. The measuring method was proved to be simple, reliable and highly sensitive. The dissolution characteristics of the 6 heavy metal elements in different solvents and with different extraction methods such as refluxing, soaking, and ultrasonic assisted extraction were studied. The experimental results showed that Ba was in the highest concentration followed by Cu and Cr, and the concentration of As, Pb and Cd was relatively lower in the herb. With the increase in ethanol concentration, the dissolution amount of Ba decreased but that of Cu and Cr increased, and the highest concentration of Cd was dissolved in acidic solution. Overall, Cd and Pb were difficult to dissolve out with 85% ethanol refluxing, but As dissolved comparatively more under the same condition. Comparing the extraction methods, the higher concentration of these 6 metals was obtained by refluxing water or alkaline water than that by 85% ethanol maceration. These differences might be related to the existent forms of these six elements in the herb. The determination and study on dissolution characteristics of these elements by using ICP-OES was important for rational using medicinal resources and ensuring the safety of drugs.
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Received: 2009-02-06
Accepted: 2009-05-08
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Corresponding Authors:
YANG Yi
E-mail: yangyi@mail.buct.edu.cn
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