| 聚乙烯醇增敏多元络合体系光度法测定痕量铅 |
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| 引用本文： | 刘梅,王建玲,郭会琴,樊静.聚乙烯醇增敏多元络合体系光度法测定痕量铅[J].河南师范大学学报(自然科学版),2007,35(1):129-132. |
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| 作者姓名： | 刘梅 王建玲 郭会琴 樊静 |
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| 作者单位： | 河南师范大学,化学与环境科学学院,河南省环境污染控制重点实验室,河南,新乡,453007 |
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| 基金项目： | 河南省自然科学基金
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河南省环境污染控制实验室基金 |
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| 摘 要： | 在H3PO4介质中,Pb(Ⅱ)-碘化钾-罗丹明6G形成红色的三元离子缔合物,缔合物的组成比为:Rh6G∶Pb(Ⅱ)∶I-=2∶1∶4,聚乙烯醇的存在可增敏该体系,摩尔吸光系数为3.64×105L.mol-1.cm-1,铅(Ⅱ)的浓度在0.01~0.4 mg.L-1范围内服从比尔定律.研究了试剂用量、温度、干扰物等因素的影响,结合巯基棉吸附,测定了4种环境水样及鸡精、猪肝、油麦菜等样品中的痕量铅.
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| 关 键 词： | Pb(Ⅱ) 聚乙烯醇 罗丹明6G 分光光度法 |
| 文章编号： | 1000-2367(2007)01-0129-04 |
| 修稿时间： | 2006年8月15日 |
Spectrophotometric Determination of Trace Pb by Polyvinyl Alcohol-Sensitized Multicomponent Complex Systems |
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| LIU Mei,WANG Jian-ling,GUO Hui-qin,FAN Jing.Spectrophotometric Determination of Trace Pb by Polyvinyl Alcohol-Sensitized Multicomponent Complex Systems[J].Journal of Henan Normal University(Natural Science),2007,35(1):129-132. |
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| Authors: | LIU Mei WANG Jian-ling GUO Hui-qin FAN Jing |
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| Abstract: | A highly sensitive spectrophotometric method has been developed for the determination of trace Pb(Ⅱ),which based on the formation of a complicated ion-association complex of Pb(Ⅱ) with rhodamine 6G and polyvinyl alcohol in the phosphate acid.The composing ratio of the complex is Rh6G∶Pb(II)∶I-= 2∶1∶4,the addition of PVA can enhance the sensitivity of the reaction and its apparent molar absorptivity is 3.64×105 L· mol-1 · cm-1.Beer's law is obeyed in the range of 0.01～0.4 μg · mL-1 for Pb(Ⅱ).The effects of the reagents' concentration,the temperature and the influence of foreign matters have been studied.Combined with the sample preparation with sulfhydryl cotton,the proposed method has been used for the determination of trace Pb(Ⅱ) in 4 water samples and 3 food samples. |
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| Keywords: | Pb(Ⅱ) polyvinyl alcohol rhodamine 6G spectrophotometry |
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