{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,13]],"date-time":"2026-02-13T06:07:52Z","timestamp":1770962872940,"version":"3.50.1"},"reference-count":17,"publisher":"Wiley","issue":"19","license":[{"start":{"date-parts":[[2012,7,20]],"date-time":"2012-07-20T00:00:00Z","timestamp":1342742400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J of Separation Science"],"published-print":{"date-parts":[[2012,10]]},"abstract":"<jats:p>Dispersive liquid\u2013liquid microextraction (DLLME) combined with gas chromatography and mass spectrometry (GC\u2010MS) was applied to the determination of five organophosphorous pesticides (OPPs) in water samples. The analytes included in this study were prophos, diazinon, chlorpyrifos methyl, fenchlorphos, and chlorpyrifos. The use of nonhalogenated solvents (cyclohexane, heptane, and octane) as extraction solvents was investigated using acetone, acetonitrile, or methanol, as dispersion solvents. The combination of less polar dispersion solvents (1\u2010propanol and 2\u2010propanol) and nonhalogenated extraction solvents was also studied in dispersive liquid\u2013liquid microextraction for the first time. Several experimental conditions were tested (nature and volume of extraction solvents, nature and volume of dispersion solvents, salting\u2010out effect) and the corresponding enrichment factors and recoveries were evaluated. The best microextraction condition was obtained using 50 \u03bcL of cyclohexane and 0.3 mL of 1\u2010propanol. The detection and quantification limits were in the low ppt range, with values between 3.3\u20138.0 ng\/L and 11.0\u201326.6 ng\/L, respectively. Relative standard deviations were between 6.6 and 13.1% for a fortification level of 500 ng\/L. At the same fortification level, the relative recoveries (RR) of Alvito's dam water, Judeu's river water, and well water samples were in the range of 50.3\u201397.1%.<\/jats:p>","DOI":"10.1002\/jssc.201200241","type":"journal-article","created":{"date-parts":[[2012,7,20]],"date-time":"2012-07-20T18:37:40Z","timestamp":1342809460000},"page":"2653-2658","source":"Crossref","is-referenced-by-count":24,"title":["Dispersive liquid\u2013liquid microextraction of organophosphorous pesticides using nonhalogenated solvents"],"prefix":"10.1002","volume":"35","author":[{"given":"Andreia","family":"Cristina Henriques Alves","sequence":"first","affiliation":[{"name":"Departamento de Ci\u00eancias e Tecnologia da Biomassa Faculdade de Ci\u00eancias e Tecnologia Universidade Nova de Lisboa  Caparica Portugal"}]},{"given":"Maria","family":"Margarida Pontes Boavida Gon\u00e7alves","sequence":"additional","affiliation":[]},{"given":"Maria","family":"Manuel Serrano Bernardo","sequence":"additional","affiliation":[]},{"given":"Benilde","family":"Sim\u00f5es Mendes","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2012,7,20]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chroma.2006.05.010"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/jssc.201100111"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chroma.2008.03.072"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00216-008-2208-4"},{"key":"e_1_2_8_6_1","first-page":"765","volume":"36","author":"Xiao\u2010Huan Z.","year":"2008","journal-title":"J. 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