Use of 8-hydroxyquinoline-chitosan chelating resin in an automated on-line preconcentration system for determination of zinc(II) by F AAS

被引：51

作者：

Carletto, Jeferson Schneider ^{[1
]}

Di Pietro Roux, Kalya Cravo ^{[1
]}

Maltez, Heloisa Franca ^{[1
]}

Martendal, Edmar ^{[1
]}

Carasek, Eduardo ^{[1
]}

机构：

[1] Univ Fed Santa Catarina, Dept Quim, BR-88040900 Florianopolis, SC, Brazil

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2008年 / 157卷 / 01期

关键词：

chelating resins; chitosan; diazotization reaction; Zinc(II); flame atomic absorption spectrometry;

D O I：

10.1016/j.jhazmat.2007.12.083

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study presents the development of an on-line preconcentration system for zinc(II) determination in aqueous samples. The analyte was trapped in a mini-column filled with a chelating resin based on a chitosan biopolymer modified with 8-hydroxyquinoline obtained by the diazotization reaction. Flow and chemical variables of the system, as well as the potential interference ions, were optimized through a multivariate procedure. The factors selected were sample pH, eluent concentration (HN03), and sample and eluent flow rates. It was verified through a full factorial design that the sample pH and eluent flow rate factors were statistically significant at the 95% confidence level. A final optimization of the significant factors was carried out using a Doehlert matrix. The preconcentration system was linear between 2.5 and 75 Rg L-1, with a regression coefficient of 0.9995. The enrichment factor was 17.6. The limits of detection and quantification were 0.8 and 2.5 Lg L-1, respectively. The repeatability and the analytical frequency were, respectively, 2.7 (25.0 lLg L', n = 8) and 18 samples per hour. Results for recovery tests using mineral water samples were between 85 and 93%. Certified reference materials were. analyzed in order to check the accuracy of the proposed method. (c) 2007 Elsevier BX All rights reserved.

引用

页码：88 / 93

页数：6

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