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Titolo:
SPME of 52 pesticides and polychlorinated biphenyls: Extraction efficiencies of the SPME coatings poly(dimethylsiloxane), polyacrylate, poly(dimethylsiloxane)-divinylbenzene, carboxen-poly(dimethylsiloxane), and carbowax-divinylbenzene
Autore:
Valor, I; Perez, M; Cortada, C; Apraiz, D; Molto, JC; Font, G;
Indirizzi:
Labaqua SA, Alicante 03007, Spain Labaqua SA Alicante Spain 03007Labaqua SA, Alicante 03007, Spain Univ Valencia, Fac Pharm, Lab Food Chem & Toxicol, Burjassot 46100, Spain Univ Valencia Burjassot Spain 46100 em & Toxicol, Burjassot 46100, Spain
Titolo Testata:
JOURNAL OF SEPARATION SCIENCE
fascicolo: 1, volume: 24, anno: 2001,
pagine: 39 - 48
SICI:
1615-9314(200101)24:1<39:SO5PAP>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLID-PHASE MICROEXTRACTION; PERFORMANCE LIQUID-CHROMATOGRAPHY; CAPILLARY GAS-CHROMATOGRAPHY; QUANTITATIVE-ANALYSIS; MASS-SPECTROMETRY; ORGANIC-COMPOUNDS; AQUEOUS SAMPLES; TRACE ANALYSIS; WATER SAMPLES; FIBERS;
Keywords:
water analysis; SPME; extraction efficiencies; fiber/water partition coefficients; partition coefficients, apparent; pesticides and PCBs; poly(dimethylsiloxane); polyacrylate; poly(dimethylsiloxane)-divinylbenzene; carboxen-poly(dimethylsiloxane); carbowax-divinylbenzene;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Valor, I Labaqua SA, C-Alona 33, Alicante 03007, Spain Labaqua SA C-Alona 33 Alicante Spain 03007 Alicante 03007, Spain
Citazione:
I. Valor et al., "SPME of 52 pesticides and polychlorinated biphenyls: Extraction efficiencies of the SPME coatings poly(dimethylsiloxane), polyacrylate, poly(dimethylsiloxane)-divinylbenzene, carboxen-poly(dimethylsiloxane), and carbowax-divinylbenzene", J SEP SCI, 24(1), 2001, pp. 39-48

Abstract

Fiber/water partition coefficients (K-fw) of 52 pesticides, including triazines, organophosphorus pesticides, organochlorine pesticides, and polychlorinated biphenyls (PCBs) were experimentally calculated for the five polymeric coatings poly(dimethylsiloxane) (PDMS), polyacrylate (PA), poly(dimethylsiloxane)-divinylbenzene (PDMS-DVB), Carboxen-poly(dimethylsiloxane) (CAR-PDMS), and Carbowax-divinylbenzene (CW-DVB) commercially available for solid-phase microextraction coupled to gas chromatography, The equilibrium-timeprofiles for the five coatings were previously studied in order to establish the time needed for equilibrium, To calculate K-fw, the amount of analyte extracted at equilibrium was obtained by gas chromatographic analysis of spiked water samples. In the case of mixed coatings in which adsorption processes are involved the term partition coefficient is not strictly correct and partition coefficient apparent is used in these cases. For the triazines, small partition coefficients were found, showing that PDMS-DVB permits the best extraction for these compounds. PA and PDMS-DVB gave the highest mean partition coefficients for the organophosphorus pesticides. Organochlorine pesticides in general gave high K-fw with all five coatings, with strongdifferences depending on the compound. In the case of PCBs a decrease in the partition coefficient with the increase of the number of chlorines substituted was observed. The results obtained indicated that the polarity of the fibers is not the main factor affecting the extraction. The presence of DVB in the mixed coatings seems to increase the uptake, probably due to adsorption processes instead of absorption. In general the PDMS-DVB coating proved to be a good choice for the analysis of the compounds under study.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 20:20:15