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A Few Systems for Flow Injection Analysis Monitoring Submicro Amounts of Fluoride Ions

用于监测亚微量氟化物离子的流动注射分析系统

基本信息

批准号：
01571188
负责人：
CHIKUMA Masahiko
金额：
$ 1.22万
依托单位：
Osaka University of Pharmaceutical Sciences
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

A few flow systems for the selective pre-concentration and determination of submicro levels of fluorides have been developed. The systems consisted of two microcolumns, which were packed with new functional resins for selective sorption of fluoride, and a fluoride ion-selective electrode in a wall-jet type cell. Fluorides were adsorbed on each of the columns using a column switching device and eluted with a dilute sodium hydroxide. The flow systems are able to be applied to the determination of submicro amounts of fluorides in environmental and biological samples.For this study, several kinds of new functional resin for selective sorption of fluorides were prepared from anion-exchange resin and La(III), Ce(III) and Pr(III) chelates of alizarin fluorine blue (AFB) and its sulfonate (AFBS). These metal chelates were immobilized not only by ion-exchange but also by nonelectrostatic interaction between AFB and AFBS molecules and the matrix of the resin. These sorbents have specific and nonspesific binding sites for sorption of fluorides. The former were ternary complex formation sites and the latter were residual ion-exchange sites. Fluorides were sorbed strongly and specifically in the presence of electrolytes by the former sites. Fluoride uptake decreased with increasing pH due to competition between fluoride and hydroxide ions. In the sorbents modified with La(III) complexes of AFB and AFBS, the sorption and desorption of fluorides were found to be almost complete. In addition, the capabilities of the two sorbents for fluoride uptake were maintained even after being used ten times.

已经开发了几种用于选择性预富集和测定亚微量氟化物的流动系统。该系统由两个微柱组成，其中填充了用于选择性吸附氟的新型功能树脂，以及一个壁喷型电池中的氟离子选择电极。氟化物通过柱切换装置吸附在每根柱上，并用稀氢氧化钠洗脱。该流动系统可用于环境和生物样品中亚微量氟化物的测定。本研究以阴离子交换树脂和茜素氟蓝（AFB）及其磺酸盐（AFBS）的La（III）、Ce（III）和Pr（III）螯合物为原料，制备了几种选择性吸附氟化物的新型功能树脂。这些金属螯合物不仅可以通过离子交换固定，还可以通过AFBS分子和树脂基质之间的非静电相互作用固定。这些吸附剂具有吸附氟化物的特异性和非特异性结合位点。前者为三元络合物形成位，后者为残留离子交换位。在电解质存在的情况下，氟化物被前两个位置强烈而特异性地吸附。由于氟化物和氢氧根离子之间的竞争，氟化物的吸收随pH值的增加而减少。在AFB和AFBS的La（III）配合物修饰的吸附剂中，氟化物的吸附和解吸几乎完全。此外，这两种吸附剂的氟吸收能力即使在使用十次后仍保持不变。