TITLE

Novel derivatisation technique for the determination of chlorophenoxy acid type herbicides by gas chromatography�mass spectrometry

AUTHOR(S)
Maloschik, Erik; M�rtl, M�ria; Sz�k�cs, Andr�s
PUB. DATE
May 2010
SOURCE
Analytical & Bioanalytical Chemistry;May2010, Vol. 397 Issue 2, p537
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The analytical detection of chlorophenoxycarboxylic-acid-type herbicides (2,4-D, dichloprop, MCPA, etc.) in environmental samples is often a problem in instrumental analysis, as these compounds containing free carboxylic groups require chemical derivatisation prior to gas chromatographic (GC) methods. Nine chlorophenoxy-acid-type herbicide active ingredients have been derivatised successfully with trimethylsilyl N, N-dimethyl carbamate and t-butyldimethylsilyl N, N-dimethyl carbamate by forming their trimethylsilyl (TMS) and t-butyldimethylsilyl (TBDMS) esters, respectively. The detection and determination of the derivatives were performed by capillary gas chromatography�mass spectrometry. The study included determination of retention indices, mass spectral properties and comparison of derivatives produced. The mass spectra of TBDMS derivatives are usually dominated by very characteristic ions [M-57]+ resulting from the cleavage of t-butyl moiety during electron impact (EI) ionisation in the mass spectrometer. Limits of detection were 5 to 100 pg applying GC with EI-MS detection in full scan mode. The method, using SPE sample preparation, was applied for the analysis of 115 ground water and surface water samples collected in B�k�s County, Hungary in 2009.
ACCESSION #
49444118

 

Related Articles

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics