Determination of various pesticides using membrane extraction discs and gas chromatography-mass spectrometry
1994; Elsevier BV; Volume: 670; Issue: 1-2 Linguagem: Inglês
10.1016/0021-9673(94)80288-2
ISSN1873-3778
AutoresC. Crespo, Rosa María Marcé, Francesc Borrull,
Tópico(s)Thermodynamic properties of mixtures
ResumoA method for the determination of a group of pesticides in water by gas chromatography-mass spectrometry with electron impact ionization was developed. The preconcentration of 500 ml of water with C18 and styrenedivinylbenzene (SDB) allowed the determination of pesticides at low-μg/1 levels. The use of SDB membrane extraction discs gave a large increase in the recovery of aldrin compared with the value obtained with C18 discs. With SDB discs the recoveries were > 85% for most compounds. The limits of detection were between 0.06 and 0.2 μg/1 in the full-scan mode. The mass spectra under positive and negative chemical ionization conditions with methane were also obtained and higher sensitivity with negative chemical ionization was obtained for most compounds.
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