C. Hidalgo et al., RAPID-DETERMINATION OF CARBARYL AND 1-NAPHTHOL AT PPT LEVELS IN ENVIRONMENTAL WATER SAMPLES BY AUTOMATED ONLINE SPE-LC-DAD-FD, Chromatographia, 47(9-10), 1998, pp. 596-600
Citations number
17
Categorie Soggetti
Chemistry Analytical","Biochemical Research Methods
A fully automated method, based on on-line solid phase extraction (SPE
) then liquid chromatography with diode-array and fluorescence detecti
on, has been developed for the trace-level determination of carbaryl a
nd 1-naphthol, its primary transformation product, in environmental wa
ter samples. By means of rapid enrichment on a 30 mm x 4 mm i.d. 10-mu
m ODS pre-column, using a 10-mL water sample, before LC determination
both compounds were recovered satisfactorily from different environme
ntal water samples spiked at various concentrations (0.05-10 mu g L-1)
. Average recoveries were between 93 and 102% with coefficients of var
iation between 1 and 4%; detection limits as low as 10 and 50 ng L-1 (
ppt) were estimated for carbaryl and 1-naphthol, respectively. With th
is small sample volume, sample throughput was up to 30 samples per day
. A carbaryl degradation study was performed by spiking a surface-wate
r sample at 2 mu g L-1. After 15 days 80% of the carbaryl was degraded
and the presence of 1-naphthol was confirmed by means of its UV spect
rum.