Investigating the presence of pesticide transformation products in water by using liquid chromatography-mass spectrometry with different mass analyzers
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comunitat-uji-handle2:10234/7013
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http://dx.doi.org/10.1002/jms.1279 |
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Title
Investigating the presence of pesticide transformation products in water by using liquid chromatography-mass spectrometry with different mass analyzersDate
2008Publisher
John Wiley & SonsBibliographic citation
Journal of Mass Spectrometry, 43, 2, p. 173–184Type
info:eu-repo/semantics/articlePublisher version
http://onlinelibrary.wiley.com/doi/10.1002/jms.1279/abstractVersion
info:eu-repo/semantics/publishedVersionSubject
Abstract
Many pesticide transformation products (TPs) can reach environmental waters as a consequence of their
normally having a higher polarity than their parent pesticides. This makes the development of analytical
methodology ... [+]
Many pesticide transformation products (TPs) can reach environmental waters as a consequence of their
normally having a higher polarity than their parent pesticides. This makes the development of analytical
methodology for reliable identification and subsequent quantification at the sub-microgram per liter levels
necessary, as required under current legislation. In this paper we report the photodegradation of several
pesticides frequently detected in environmental waters from the Spanish Mediterranean region using the
high-resolution and exact-mass capabilities of hybrid quadrupole time-of-flight mass spectrometry (QTOF
MS) hyphenated to liquid chromatography (LC). Once the main photodegradation/hydrolysis products
formed in aqueous media were identified, analytical methodology for their simultaneous quantification
and reliable identification in real water samples was developed using on-line solid-phase extraction (SPE)-
LC-tandemMS with a triple-quadrupole (QqQ) analyzer. The methodology was validated in both ground
and surface water samples spiked at the limit of quantification (LOQ) and 10 × LOQ levels, i.e. 50 and
500 ng/l, obtaining satisfactory recoveries and precision for all compounds. Subsequent analysis of ground
and surface water samples resulted in the detection of a number of TPs higher than parent pesticides.
Additionally, several soil-interstitial water samples collected from the unsaturated zone were analyzed to
explore the degradation/transformation of some pesticides in the field using experimental plots equipped
with lisimeters. Several TPs were found in these samples, with most of them having also been detected
in ground and surface water from the same area. This paper illustrates the extraordinary potential of LCMS(/
MS) with QTOF and QqQ analyzers for qualitative/structural and quantitative analysis, respectively,
offering analytical chemists one of the most powerful tools available at present to investigate the presence
of pesticide TPs in water. [-]
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Copyright 2007 John Wiley & Sons, Ltd.
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