| 双硫腙目视比色法快速测定白菜中的微量铅 |
| 投稿时间：2005-12-13 修订日期：2005-12-21 点此下载全文 |
| 引用本文：王瑞斌.双硫腙目视比色法快速测定白菜中的微量铅[J].西北农业学报,2006,15(3):109~111,127 |
| DOI:10.7606/j.issn.1004-1389.2006.03.026 |
| 摘要点击次数: 37 |
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| 中文摘要:研究了采用双硫腙目视比色法快速测定白菜中的微量铅。样品消解后,利用控制溶液酸度的办法加入掩蔽剂以消除共存离子的干扰。再加入双硫腙的三氯甲烷溶液,根据Pb2+离子与双硫腙生成的配合物在有机溶剂中的颜色深浅与铅含量在一定范围内成正比的关系,用目视比色法即可快速判断出样品中的铅含量。改进后的方法,既保留了原双硫腙光度法消除干扰离子的优点,又不使用任何光学仪器,也不需要配制标准系列色阶,操作简单、快速、准确、省时,测定结果的相对偏差(Dr)<5%,其相对标准偏差(RSD≤2.5%,可满足国家标准的限量要求。是一种快捷、灵敏、高效的测定微量铅的方法。 |
| 中文关键词:双硫腙 目视比色法 白菜 微量铅 快速测定 |
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| Rapid Determination of Trace Lead in the Chinese Cabbage by the Visual Colorimetry of Dithizone |
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| Abstract:The study deals with the rapid determination of trace lead in the Chinese cabbage by the visual colorimetry of dithizone.After dissolving the sample,the masking agent is added by means of solution acidity control so as to eliminate the glitch of the coexistedions.Then dithizone and chloroform solution are added in the sample.According to the direct ratio relationship in a certain range between the color degree of the organic solvent with Pb2+ and dithizone in the complex compound and the amount of the lead,the amount of the lead can be rapidly determined by way of the visual colorimetry. This improved method keeps the merits of dithizone photometric way to eliminate the glitch of the ions,and also,there is no optics ins rument and standard color gradation in use.This approach is simple,fast,accurate and time saving.The relative deviation of determination result is <5%,RSD% is ≤ 2.5%,which meets the requirement of the national standard.This is a fast,ingenuity and high efficiency method to determine the trace lead. |
| keywords:Dithizone Visual colorimetry Chinese cabbage Trace lead Rapid determination |
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