{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,21]],"date-time":"2026-01-21T21:20:56Z","timestamp":1769030456239,"version":"3.49.0"},"reference-count":53,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2012,6,28]],"date-time":"2012-06-28T00:00:00Z","timestamp":1340841600000},"content-version":"vor","delay-in-days":27,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia","award":["PEst-C\/EQB\/LA0006\/2011"],"award-info":[{"award-number":["PEst-C\/EQB\/LA0006\/2011"]}]},{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia","award":["BD\/47200\/2008"],"award-info":[{"award-number":["BD\/47200\/2008"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J of Separation Science"],"published-print":{"date-parts":[[2012,6]]},"abstract":"<jats:p>A QuEChERS method has been developed for the determination of 14 organochlorine pesticides in 14 soils from different Portuguese regions with wide range composition. The extracts were analysed by GC\u2010ECD (where GC\u2010ECD is gas chromatography\u2010electron\u2010capture detector) and confirmed by GC\u2010MS\/MS (where MS\/MS is tandem mass spectrometry). The organic matter content is a key factor in the process efficiency. An optimization was carried out according to soils organic carbon level, divided in two groups: HS (organic carbon &gt;2.3%) and LS (organic carbon &lt;2.3%). The method was validated through linearity, recovery, precision and accuracy studies. The quantification was carried out using a matrix\u2010matched calibration to minimize the existence of the matrix effect. Acceptable recoveries were obtained (70\u2013120%) with a relative standard deviation of \u226416% for the three levels of contamination. The ranges of the limits of detection and of the limits of quantification in soils HS were from 3.42 to 23.77 \u03bcg kg<jats:sup>\u22121<\/jats:sup> and from 11.41 to 79.23 \u03bcg kg<jats:sup>\u22121<\/jats:sup>, respectively. For LS soils, the limits of detection ranged from 6.11 to 14.78 \u03bcg kg<jats:sup>\u22121<\/jats:sup> and the limits of quantification from 20.37 to 49.27 \u03bcg kg<jats:sup>\u22121<\/jats:sup>. In the 14 collected soil samples only one showed a residue of dieldrin (45.36 \u03bcg kg<jats:sup>\u22121<\/jats:sup>) above the limit of quantification. This methodology combines the advantages of QuEChERS, GC\u2010ECD detection and GC\u2010MS\/MS confirmation producing a very rapid, sensitive and reliable procedure which can be applied in routine analytical laboratories.<\/jats:p>","DOI":"10.1002\/jssc.201200087","type":"journal-article","created":{"date-parts":[[2012,6,28]],"date-time":"2012-06-28T07:41:12Z","timestamp":1340869272000},"page":"1521-1530","source":"Crossref","is-referenced-by-count":85,"title":["Optimization of <scp>Q<\/scp>u<scp>EC<\/scp>h<scp>ERS<\/scp> method for the analysis of organochlorine pesticides in soils with diverse organic matter"],"prefix":"10.1002","volume":"35","author":[{"given":"Lu\u00edsa","family":"Correia\u2010S\u00e1","sequence":"first","affiliation":[{"name":"REQUIMTE Instituto Superior de Engenharia do Porto  Porto Portugal"},{"name":"FCNAUP  Porto Portugal"}]},{"given":"Virg\u00ednia C.","family":"Fernandes","sequence":"additional","affiliation":[{"name":"REQUIMTE Instituto Superior de Engenharia do Porto  Porto Portugal"},{"name":"CIQ (Investigation Centre)  Porto Portugal"}]},{"given":"Manuela","family":"Carvalho","sequence":"additional","affiliation":[{"name":"REQUIMTE Instituto Superior de Engenharia do Porto  Porto Portugal"}]},{"given":"Concei\u00e7\u00e3o","family":"Calhau","sequence":"additional","affiliation":[{"name":"Department of Biochemistry (U38\u2010FCT) Faculty of Medicine  University of Porto, Porto Portugal"}]},{"given":"Valentina F.","family":"Domingues","sequence":"additional","affiliation":[{"name":"REQUIMTE Instituto Superior de Engenharia do Porto  Porto Portugal"}]},{"given":"Cristina","family":"Delerue\u2010Matos","sequence":"additional","affiliation":[{"name":"REQUIMTE Instituto Superior de Engenharia do Porto  Porto Portugal"}]}],"member":"311","published-online":{"date-parts":[[2012,6,28]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chroma.2010.02.060"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0048-9697(98)00298-8"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chroma.2008.02.080"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.aca.2011.01.023"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chemosphere.2010.06.036"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.chroma.2011.06.066"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1039\/b300555k"},{"key":"e_1_2_7_9_1","author":"Fernandes V. 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