NDLI: Influences of metal cations on the determination of the α-oxocarboxylates as the methyl esters of the <i>O</i>-(2,3,4,5,6-pentafluorobenzyl)oximes by gas chromatography: the importance of accounting for matrix effects

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Influences of metal cations on the determination of the α-oxocarboxylates as the methyl esters of the O-(2,3,4,5,6-pentafluorobenzyl)oximes by gas chromatography: the importance of accounting for matrix effects

Content Provider	Royal Society of Chemistry (RSC)
Author	Urbansky, Edward T.
Copyright Year	2000
Abstract	The α-oxocarboxylates (α-ketocarboxylates) and the corresponding α-oxoacids (α-ketoacids) have been reported as disinfection byproducts of ozonation of potable water supplies. In this analytical method, the oxo moiety is derivatized with O-(2,3,4,5,6-pentafluorobenzyl)oxylamine (PFBOA) to form an oxime which is then extracted into tert-butyl methyl ether. The carboxylic acid moiety is esterified (methylated) with diazomethane. In this study, five analytes were investigated: oxoethanoate (glyoxylate), 2-oxopropanoate (pyruvate), 2-oxobutanoate (2-ketobutyrate), 2-oxopentanoate (2-ketovalerate), and oxopropanedioate (ketomalonate, mesoxalate). The influence of Lewis acid metal cations in the water matrix was evaluated for the gas chromatographic method commonly used for the quantitation of these analytes at concentrations ≤150 ng mL−1. Tested metals included Ca(II), Mg(II), Fe(III), Cu(II) and Zn(II). At typical concentrations, calcium, in particular, can have profound impact, especially on oxoethanoate quantitation. Oxopropanoate experiences an increase in recovery in the presence of metal cations. 2-Oxobutanoate and 2-oxopentanoate are the most resistant to these effects, but 2-oxopentanoate shows increased recoveries at higher concentrations when assayed in the presence of calcium ion. Oxopropanedioate generally shows poorer precision and recovery when determined in solutions containing metal ions. This investigation demonstrates the significance of metal effects in the quantitative determination of these analytes and further emphasizes the importance of thorough matrix characterization and careful recovery studies with fortified (spiked) samples and blanks.
Starting Page	334
Ending Page	338
Page Count	5
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	2
Issue Number	4
Journal	Journal of Environmental Monitoring
DOI	10.1039/b003065l
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Lewis Ozone Oxime Butyl group Diethyl ether Carboxylic acid Diazomethane Glyoxylic acid Pyruvic acid Mitochondrial matrix Chromatography Calcium Ion
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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