Determination of organochlorine pesticides in river water by gas chromatography-negative-ion chemical-ionization mass spectrometry using large volumeinjection
S. Nakamura et al., Determination of organochlorine pesticides in river water by gas chromatography-negative-ion chemical-ionization mass spectrometry using large volumeinjection, ANALYST, 126(10), 2001, pp. 1658-1662
A method for the determination of 24 organochlorine pesticides by gas chrom
atography-mass spectrometry (GC-MS) with negative-ion chemical-ionization (
NICI) using programmable temperature vaporizer (PTV)-based large volume inj
ection (LVI) is described. The ion source temperature was determined to be
150 degreesC for the optimized NICI-selected ion monitoring (SIM) condition
s. PTV inlet parameters were also optimized. The sensitivities of the pesti
cides by splitless-GC-NICI-MS were approximately 7.8-360 times higher than
those of the pesticides by splitless-GC-EI-MS. The sensitivities of the pes
ticides by LVI-GC-NICI-MS were over 80 times higher than those of the pesti
cides by spiltless-GC-NICI-MS. This method was applied to the determination
of the pesticides in river water using micro liquid-liquid extraction as s
ample preparation. The recoveries of the pesticides from a river water samp
le spiked with standards at 2 ng l(-1) and 20 ng l(-1) were 75-111% (RSD, 2
.9-15%) and 92-105% (RSD, 0.5-5.6%), respectively. The methodical detection
limits ranged from 0.004 to 2.2 ng l(-1).