COMPARISON OF SORBENTS FOR THE SOLID-PHASE EXTRACTION OF THE HIGHLY POLAR DEGRADATION PRODUCTS OF ATRAZINE (INCLUDING AMMELINE, AMMELIDE AND CYANURIC ACID)
V. Pichon et al., COMPARISON OF SORBENTS FOR THE SOLID-PHASE EXTRACTION OF THE HIGHLY POLAR DEGRADATION PRODUCTS OF ATRAZINE (INCLUDING AMMELINE, AMMELIDE AND CYANURIC ACID), Journal of chromatography, 711(2), 1995, pp. 257-267
Citations number
32
Categorie Soggetti
Chemistry Analytical","Biochemical Research Methods
Three different types of non-polar sorbents, i.e., C-18 silica, apolar
styrene-divinylbenzene copolymer (PRP-1) and porous graphitic carbon
(PGC), were compared for the solid-phase extraction of atrazine, simaz
ine and nine degradation products obtained by dealkylation, dehalogena
tion, hydroxylation or deamination mechanisms. The C-18 silica was sho
wn to be effective only for the first degradation products (deethyl-,
deisopropyl- and hydroxyatrazine), the others being too polar. Despite
a higher retention provided by PRP-1, the retention of the hydroxy-de
alkylated derivatives is too low to allow the handling of a sufficient
ly large volume for determinations below the mu g/l level. The more po
lar derivatives, i.e., ammeline, ammelide and cyanuric acid, are not r
etained by either C-18 silica or PRP-1, whereas the capacity factor me
asured on a PGC column eluted with water was above 100. The conditions
of extraction and elution using a cartridge packed with 500 mg of PGC
are described for all the series of compounds and recoveries above 90
% were obtained from 500-ml samples. The analytical separation was car
ried out using a C-18 silica column and confirmation was obtained usin
g a PGC column. Determinations of the degradation products in real sam
ples are presented with detection limits below the 0.1 mu g/l level.