{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,13]],"date-time":"2026-02-13T06:07:11Z","timestamp":1770962831763,"version":"3.50.1"},"reference-count":29,"publisher":"Wiley","issue":"18","license":[{"start":{"date-parts":[[2011,7,28]],"date-time":"2011-07-28T00:00:00Z","timestamp":1311811200000},"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":[[2011,9]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Solid\u2010phase extraction combined with dispersive liquid\u2013liquid microextraction (SPE\u2010DLLME) was applied for the extraction of six organophosphorous pesticides (OPPs) in water samples. The analytes considered in this study were determined by gas chromatography with mass spectrometry and included prophos, diazinon, chlorpyrifos methyl, methyl parathion, fenchlorphos and chlorpyrifos. Several extraction conditions (extraction solvent and elution\/dispersion solvents nature, extraction solvent volume, elution solvent volume, water volume and sample volume) were tested for SPE\u2010DLLME with these analytes and the best results were obtained using carbon tetrachloride as the extraction solvent and acetone as the elution\/dispersion solvent. Calibration curves for the determination of OPPs in water samples were constructed in the concentration range of 10\u2013100\u2009ng\/L. Limits of detection (LODs) ranged from 38 to 230\u2009pg\/L values that are below the maximum admissible level for drinking water (100\u2009ng\/L). Relative standard deviations (RSD) were between 8.6 and 10.4% for a fortification level of 100\u2009ng\/L. At the same fortification level, the relative recoveries (R.R.) of tap, well and irrigation water samples were in the range of 30.2\u201397.1%.<\/jats:p>","DOI":"10.1002\/jssc.201100434","type":"journal-article","created":{"date-parts":[[2011,7,28]],"date-time":"2011-07-28T06:21:55Z","timestamp":1311834115000},"page":"2475-2481","source":"Crossref","is-referenced-by-count":35,"title":["Determination of organophosphorous pesticides in the ppq range using a simple solid\u2010phase extraction method combined with dispersive liquid\u2013liquid microextraction"],"prefix":"10.1002","volume":"34","author":[{"given":"Andreia Cristina Henriques","family":"Alves","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maria Margarida Pontes Boavida","family":"Gon\u00e7alves","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Maria Manuel Serrano","family":"Bernardo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Benilde Sim\u00f5es","family":"Mendes","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2011,7,28]]},"reference":[{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1201\/9781420006315"},{"key":"e_1_2_6_3_2","unstructured":"World Health Organization (WHO) WHO Guidelines for Drinking\u2010Water Quality 2006 Vol. 1 3rd Edn. 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