A critical evaluation of a long pathlength cell for flow-based spectrophotometric measurements

被引：17

作者：

Infante, Carlos M. C. ^{[1
]}

Rocha, Fabio R. P. ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo, Brazil

来源：

MICROCHEMICAL JOURNAL | 2008年 / 90卷 / 01期

基金：

巴西圣保罗研究基金会;

关键词：

flow analysis; spectrophotometry; long pathlength spectrophotometry; liquid core waveguides; Schlieren effect;

D O I：

10.1016/j.microc.2008.02.006

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Coupling of a flow cell based on a liquid core waveguide (LCW) to flow systems for spectro photometric measurements was critically evaluated. Flow-based systems with and without chemical reactions were exploited to estimate the increase in analytical signal in comparison to those obtained with a conventional I cm cell under different experimental conditions. The Schlieren effect associated to intense concentration gradients in the sample zone was investigated with model solutions that do not absorb visible electromagnetic radiation. The effect of radiation scattering was lower than the expected by considering the increase in the optical path, being the magnitude of the perturbation up to 40% higher for the 100-cm LCW cell. Several alternatives for compensation of the Schlieren effect were experimentally investigated. The potentiality of the LCW for turbidimetric measurements and coupling to monosegmented flow analysis was also evaluated. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：19 / 25

页数：7

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