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Completely automated system for determining halogenated organic compounds by multisyringe flow injection analysis

journal contribution
posted on 2023-05-19, 20:36 authored by Fernando Maya AlejandroFernando Maya Alejandro, Estela, JM, Cerda, V

A new, multisyringe flow injection setup was designed to develop the first completely automated flow methodology for the expeditious, accurate in-line determination of halogenated organic compounds (HOCs) in water. The target compounds are preconcentrated and isolated by solid-phase extraction. Following elution, previously organically bound halogens are released as free hydrogen halides by the combined action of UV light and a chemical oxidant for their subsequent spectrophotometric determination by reaction with Hg(SCN)2 and Fe3+. Optimizing the major hydrodynamic and chemical variables resulted in improved performance. Recovery of various HOCs was assessed, and potential interferents were examined. Under the selected operating conditions, the proposed method exhibits variable analytical performance depending on the particular sample volume used (e.g., a sample volume of 5 mL provides a linear working range of 140−2000 μg L−1, a LOD of 100 μg L−1, and a throughput of 9 samples h−1). The method was successfully used to determine total adsorbable organic halogens (AOX) in well water and leachates, and the results validated against an AOX reference method. The role of the proposed system in the environmental analytical field is critically discussed.

History

Publication title

Analytical Chemistry

Volume

80

Issue

15

Pagination

5799-5805

ISSN

0003-2700

Department/School

School of Natural Sciences

Publisher

Amer Chemical Soc

Place of publication

1155 16Th St, Nw, Washington, USA, Dc, 20036

Rights statement

Copyright 2008 American Chemical Society

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences

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