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
收藏
页码：88 / 93
页数：6
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