Title

Investigation of stability of aqueous solutions containing trace amounts of volatile organic analytes

Document Type

Article

Publication Date

6-1-2006

Publication Title

Trends in Analytical Chemistry

Abstract

When determining volatile organohalogen compounds in an aqueous matrix, specific properties of these compounds should be taken into consideration, when preparing aqueous standard solutions used for calibration and during model investigations, namely:•low boiling points;•high vapor pressure; and,•relatively low solubility in water.Because of the significance of this problem and the lack of practical information available in the literature, we carried out model investigations of stability of selected volatile analytes in aqueous solutions. The experimental results were used to estimate the time after which the result of determination may not reflect the true concentration of the analyte. The investigations provided information on:•the method of preparation of model solutions (in appropriate containers);•the method of storage and the storage time of these solutions; and,•number of repetitions needed in the final determination (repeated sampling of the solution from a volumetric flask, which requires the flask to be opened for each sampling). This parameter is especially important when determining the repeatability and the reproducibility in validating the procedure for TLHS-DAI-GC-ECD.

Volume

25

Issue

6

First Page

609

Last Page

620

DOI

https://doi.org/10.1016/j.trac.2006.03.004

ISSN

0165-9936

Rights

© 2006 Elsevier Ltd.

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