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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Caballo, C. Sicilia, M. D. Rubio, S. |
| Description | Country affiliation: Spain Author Affiliation: Caballo C ( Department of Analytical Chemistry, Institute of Fine Chemistry and Nanochemistry, University of Córdoba, Edificio Anexo Marie Curie, Campus de Rabanales, 14071 Córdoba, Spain.) |
| Abstract | Liquid chromatography (LC)/tandem mass spectrometry (MS/MS) after supramolecular solvent-based microextraction (SUSME) was firstly used in this work for the enantioselective determination of chiral pesticides in natural waters. The method developed for the quantitation of the R- and S-enantiomers of mecoprop (MCPP) and dichlorprop (DCPP) involved the extraction of the herbicides in a supramolecular solvent (SUPRAS) made up of reverse aggregates of dodecanoic acid (DoA), analyte re-extraction in acetate buffer (pH = 5.0), separation of the target enantiomers on a chiral column of permethylated -cyclodextrin under isocratic conditions, and detection of the daughter ions (m/z = 140.9 and 160.6 for MCPP and DCPP, respectively) using a hybrid triple quadrupole mass spectrometer equipped with an electrospray source operating in the negative ion mode. Similar recoveries (ca. 75%) and actual concentration factors (ca. 94) were obtained for both phenoxypropanoic acids (PPAs). The quantitation limits were 1 ng L(-1) for R- and S-MCPP, and 4 ng L(-1) for R- and S-DCPP, and the precision, expressed as relative standard deviation (n = 6) was in the ranges 2.4-2.7% ([R-MCPP] = [S-MCPP] = 5 ng L(-1) and [R-DCPP] = [S-DCPP] = 15 ng L(-1)) and 1.6-1.8% (100 ng L(-1) of each enantiomer). The SUSME-LC-MS/MS method was successfully applied to the determination of the enantiomers of MCPP and DCPP in river and underground waters, fortified at concentrations between 15 and 180 ng L(-1) at variable enantiomeric ratios (ER = 1-9). |
| File Format | HTM / HTML |
| ISSN | 00032670 |
| Volume Number | 761 |
| e-ISSN | 18734324 |
| Journal | Analytica Chimica Acta |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2013-01-25 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Analytical Discipline Chemistry 2,4-dichlorophenoxyacetic Acid Analogs & Derivatives 2-methyl-4-chlorophenoxyacetic Acid Liquid Phase Microextraction Methods Pesticides Analysis Tandem Mass Spectrometry Water Pollutants, Chemical Isolation & Purification Chromatography, Liquid Economics Groundwater Limit Of Detection Rivers Chemistry Stereoisomerism Evaluation Studies Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Environmental Chemistry Analytical Chemistry Biochemistry |
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