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Standardization for trace metal ion speciation by the electrochemical

通过电化学方法对痕量金属离子形态进行标准化

基本信息

批准号：
10640592
负责人：
YOKOI Kunihiko
金额：
$ 2.11万
依托单位：
Osaka Kyoiku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640592/
关键词：
adsorptive collection voltammetry trace analysis speciation metal ions humic acid complexing capacity conditional stability constants 吸着網縮

项目摘要

To establish the procedure of the standardization for trace metal ion speciation, fundamental data, such as complexing capacity(CC) and the conditional stability constants(K'), for the interaction of metal ion (copper and nickel) and humas(humic(HA) and fulvic acids(FA)) were collected. HA and FA were prepared as standard materials by The Japan Society for Humic Substances. CC and K' were estimated from metal ion titration by adsorptive stripping voltammetry. Quinoline-8-ol(OX) and dimethylglyoxime(DMG) were used as complexing ligands for copper and nickel, respectively. As the increase of the concentration of OX and DMG, CuCC and NiCC for HA and FA were decreased while K's were increased. This indicates the presence of various coordination sites having different coordination ability, because HA and FA are the mixture of organic compounds having various functional groups and large molecular weights. The relative values for CuCC(HA), NiCC(HA), CuCC(FA) and NiCC(FA) were ca. 450, 30, 30 … More and 1, respectively. To explain these results based on chemical equilibria, three coordination groups, having different number of sites(that is,CC) and K', were assumed. And then, the simulated metal ion titration curve were analyzed by the normal procedure for obtaining CC and K' based on the assumption that one metal ion reacts with one coordination site. This calculation was repeated for different initial CC and K' for assumed coordination sites till the calculated CC and K' were within the range of observed values. For the interactions of Cu-HA, Ni-HA, Cu-FA, good agreement was obtained between observed and calculated values. This enabled us to discuss about the distribution of coordination sites in HA and FA. Additional projects for speciation were also carried out on popularization of the concept of speciation, contamination-free pre-treatment of water samples by UV irradiation with high output low-pressure mercury lamp, electrochemical ultra trace analysis using catalytic effect, synthesis of multidentate ligands to specaiate lanthanide ions and their application to solvent extraction, and production of big wheel mixed-valence compounds to speciate giant molecules. Novel results were also obtained for these projects. Less

为了建立痕量金属离子形态标准化的程序，收集了金属离子（铜和镍）与腐殖酸（HA和FA）相互作用的基础数据，如络合容量（CC）和条件稳定常数（K '）。HA和FA由The Japan Society for Humic Substances制备作为标准物质。用吸附溶出伏安法从金属离子滴定中估算CC和K'。分别以喹啉-8-醇（OX）和丁二酮肟（DMG）作为铜和镍的络合配体。随着OX和DMG浓度的增加，HA和FA的CuCC和NiCC降低，而K的增加。这表明存在具有不同配位能力的各种配位位点，因为HA和FA是具有各种官能团和大分子量的有机化合物的混合物。CuCC（HA）、NiCC（HA）、CuCC（FA）和NiCC（FA）的相对值约为0.001。四百五十，三十，三十 ...更多信息和1中所示。为了根据化学平衡解释这些结果，假设了具有不同数量的位点（即CC）和K '的三个配位基团。然后，基于一个金属离子与一个配位位点反应的假设，通过获得CC和K'的正常程序来分析模拟的金属离子滴定曲线。对于假设的配位位点，对于不同的初始CC和K'重复该计算，直到计算的CC和K'在观察值的范围内。对于Cu-HA、Ni-HA、Cu-FA的相互作用，计算值与实测值吻合较好。这使得我们能够讨论HA和FA中的协调位点的分布。此外，还开展了形态分析方面的其他项目，如普及形态分析概念、用高输出低压汞灯紫外线照射对水样进行无污染预处理、利用催化效应进行电化学超痕量分析、合成多齿配体以特异性镧系离子及其在溶剂萃取中的应用，以及生产大轮混合价化合物以使大分子形态分析。这些项目也取得了新的成果。少