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Preparation of admicelle and its application to trace analysis

胶束的制备及其在痕量分析中的应用

基本信息

批准号：
10640590
负责人：
HIRAIDE Masataka
金额：
$ 2.05万
依托单位：
Nagoya 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 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640590/
关键词：
Enrichment Trace element Admicelle Alumina Sodium dodecyl Humic complex Humic substance Water analysis sulfate 分離媒体フミン酸フルボ酸 APDC ICP-MS 吸着ジチゾン

项目摘要

Separation and preconcentration steps are indispensable prior to the determination, in order to obtain accurate and reproducible analytical results. In the present study, surfactant aggregates formed on solid surfaces (i.e., admicelle) were used for the enrichment of trace heavy metals in water. Because the surface of alumina was positively charged in acidic solutions, sodium dodecyl sulfate (anionic surfactant, SDS) was strongly adsorbed to form admicelles. Nanogram quantities of heavy metals (e.g., Ni, Cu, Cd, Pb) were reacted with pyrrolidinedithiocarbamate (APDC) at pH 2〜6 and the resulting hydrophobic chelate was completely collected on the admicelle column. In the case of dithizone-impregnated admicelles, trace heavy metals were immediately recovered from water without the addition of APDC.Those metals were desorbed from the column with diluted nitric acid, leaving SDS on the column. Because of acidproof admicelles, the column was usable repeatedly.Separation behavior of humic substance was also examined in detail. Humic and fulvic acids were completely adsorbed on the admicelle column at pH 1〜9. It is interesting that negatively charged humic substances are easily adsorbed on the aggregates of anionic surfactant, which indicates that the humic substance interacts with alumina particles strongly than SDS.Humic complexes of heavy metals were also adsorbed on the column. The proposed method is simple and rapid, and it has been successfully applied to the analysis of synthetic water samples as well as certified reference materials.

为了获得准确和可重复的分析结果，分离和富集步骤是测定前不可缺少的。在本研究中，表面活性剂聚集体形成的固体表面（即ad胶束）用于水中微量重金属的富集。由于氧化铝表面在酸性溶液中带正电，十二烷基硫酸钠（阴离子表面活性剂，SDS）被强吸附形成胶束。在pH值为2 ~ 6的条件下，用吡咯烷二硫代氨基甲酸酯（pyrolidinedithiocarbamate， APDC）与纳米克重金属（如Ni、Cu、Cd、Pb）反应，得到的疏水螯合物被完全收集在ad胶束柱上。在双硫腙浸渍胶束的情况下，在不添加APDC的情况下，痕量重金属可以立即从水中回收。用稀释的硝酸将这些金属从色谱柱中解吸出来，在色谱柱上留下SDS。由于具有耐酸胶束，色谱柱可重复使用。并对腐殖质的分离行为进行了详细的研究。腐殖酸和黄腐酸在pH值为1 ~ 9的ad胶束柱上被完全吸附。有趣的是，带负电荷的腐殖质更容易吸附在阴离子表面活性剂的聚集体上，这表明腐殖质与氧化铝颗粒的相互作用强于SDS。重金属腐殖质络合物也吸附在柱上。该方法简便、快速，已成功应用于合成水样和标准物质的分析。