caa a22 4500 445802987 CHVBK 20180317145147.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10337-011-1989-3 doi (NATIONALLICENCE)springer-10.1007/s10337-011-1989-3 Electrospun Nanofibers Sorbents for Pre-Concentration of 1,1-dichloro-2,2 bis-(4-chlorophenyl)ethylene with Subsequent Desorption by Pressurized Hot Water Extraction [Elektronische Daten] [David Adeyemi, Janes Mokgadi, James Darkwa, Chimezie Anyakora, Grace Ukpo, Charlotta Turner, Nelson Torto] Electrospun polystyrene (PS) nanofibers (130-500nm) incorporating a potassium salt of imidazole-1-carbodithioate were evaluated as potential sorbents for the pre-concentration of a model organochlorine pesticide; 1,1-dichloro-2,2bis-(4-chlorophenyl)ethylene (DDE). The efficiencies of DDE (0.25-1.0μgL−1) adsorption by the nanofiber sorbent followed by desorption employing pressurized hot water extraction (PHWE) were investigated and monitored using gas chromatography with electron capture detection (GC-ECD). Parameters such as time, temperature and pressure of extraction, sample volume, DDE concentration and sorbent mass were optimized. The maximum adsorption of DDE (0.50μgL−1) on electrospun PS and carbodithioate incorporated PS nanofibers was at 43.7 and 94.6%, respectively, in 20min. Incorporation of carbodithiote doubled the adsorption efficiency of PS and achieved LOD of 0.000234μgL−1 for DDE. The optimal DDE desorption on the PHWE system was 93.8% in 10min. It would seem that the use of electrospun nanofibers as sorbent material with subsequent desorption by PHWE has great potential and thus warrants further investigations. This approach as it uses water as an extraction solvent for an organochlorine pesticide provides an opportunity to eliminate organic solvents, especially for procedures aimed at monitoring organic pollutants in the environment. Springer-Verlag, 2011 Electrospun nanofibers nationallicence Sorbents nationallicence Pre-concentration nationallicence Organochlorine pesticides nationallicence Adeyemi David Department of Chemistry, Rhodes University, P O Box 94, 6140, Grahamstown, South Africa aut Mokgadi Janes Department of Chemistry, Rhodes University, P O Box 94, 6140, Grahamstown, South Africa aut Darkwa James Department of Chemistry, University of Johannesburg, P.O Box 524, Auckland Park, South Africa aut Anyakora Chimezie Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Lagos, Lagos, Nigeria aut Ukpo Grace Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Lagos, Lagos, Nigeria aut Turner Charlotta Department of Chemistry, Center for Analysis and Synthesis, Lund University, 221 00, Lund, Sweden aut Torto Nelson Department of Chemistry, Rhodes University, P O Box 94, 6140, Grahamstown, South Africa aut Chromatographia Springer-Verlag 73/9-10(2011-05-01), 1015-1020 0009-5893 73:9-10<1015 2011 73 10337 https://doi.org/10.1007/s10337-011-1989-3 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10337-011-1989-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Adeyemi David Department of Chemistry, Rhodes University, P O Box 94, 6140, Grahamstown, South Africa aut NATIONALLICENCE 700 1- Mokgadi Janes Department of Chemistry, Rhodes University, P O Box 94, 6140, Grahamstown, South Africa aut NATIONALLICENCE 700 1- Darkwa James Department of Chemistry, University of Johannesburg, P.O Box 524, Auckland Park, South Africa aut NATIONALLICENCE 700 1- Anyakora Chimezie Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Lagos, Lagos, Nigeria aut NATIONALLICENCE 700 1- Ukpo Grace Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Lagos, Lagos, Nigeria aut NATIONALLICENCE 700 1- Turner Charlotta Department of Chemistry, Center for Analysis and Synthesis, Lund University, 221 00, Lund, Sweden aut NATIONALLICENCE 700 1- Torto Nelson Department of Chemistry, Rhodes University, P O Box 94, 6140, Grahamstown, South Africa aut NATIONALLICENCE 773 0- Chromatographia Springer-Verlag 73/9-10(2011-05-01), 1015-1020 0009-5893 73:9-10<1015 2011 73 10337 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer