Author
Carel Cortada
Bio: Carel Cortada is an academic researcher. The author has contributed to research in topics: Partition coefficient & Solid-phase microextraction. The author has an hindex of 1, co-authored 1 publications receiving 63 citations.
Papers
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TL;DR: In this article, the fiber/water partition coefficients 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), polydimethylsoxane)-Divinylbenzene (PDMBS), Carboxen-poly(dimethyltesiloxane), and Carbowax-divinylbenzinene (CW-
Abstract: Fiber/water partition coefficients (Kfw) 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-time profiles for the five coatings were previously studied in order to establish the time needed for equilibrium. To calculate Kfw 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 Kfw with all five coatings, with strong differences 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.
67 citations
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TL;DR: High sorption capacity of microplastics implies the importance of MP-associated transport of HOCs in the marine environment and partition coefficients between MPs and seawater measured showed good linear correlations with log Kow.
415 citations
TL;DR: A novel graphene (G) based solid-phase microextraction (SPME) fiber was firstly prepared by immobilizing the synthesized G on stainless steel wire as coating and showed excellent thermal, chemical and mechanical stability, and long lifespan.
226 citations
TL;DR: The use of solid phase microextraction (SPME) for trace element speciation has been extensively studied in the inorganic analytical field, see as discussed by the authors for a short overview of the principles of SPME operation.
164 citations
TL;DR: The proposed methodology was applied for the simultaneous determination of PAHs, PCBs, PEs and NPs in sea and estuarine waters and remarkable recovery, repeatability and reproducibility were attained.
142 citations
TL;DR: The application of a new extraction technique: single-drop microextraction (SDME), followed by gas chromatography with electron-capture detection, was assessed for determining alpha-endosulfan and beta-endOSulfan in water samples.
127 citations