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Talanta

Talanta

May

137

167

173

CI: Copyright (c) 2015; JID: 2984816R; 0 (Organophosphorus Compounds); 0 (Pesticides); 0 (Soil); 0 (Solvents); 0 (Water Pollutants, Chemical); OTO: NOTNLM; 2014/09/23 [received]; 2015/01/22 [revised]; 2015/01/23 [accepted]; 2015/02/04 [aheadofprint]; ppub

Netherlands

1873-3573; 0039-9140

PMID: 25770621

eng

Journal Article; IM

10.1016/j.talanta.2015.01.031 [doi]

Unknown(0)

25770621

Ultrasound leaching-solid phase extraction (USL-SPE) followed by dispersive-solidification liquid-liquid microextraction (DSLLME) was developed for preconcentration and determination of organophosphorus pesticides (OPPs) in soil samples prior gas chromatography-mass spectrometry analysis. At first, OPPs were ultrasonically leached from soil samples by using methanol. After centrifugation, the separated methanol was diluted to 50 mL with double-distillated water and passed through the C18 SPE cartridge. OPPs were eluted with 1 mL acetonitrile. Thus, 1 mL acetonitrile extract (disperser solvent) and 10 microL 1-undecanol (extraction solvent) were added to 5 mL double-distilled water and a DSLLME technique was applied. The variables of interest in the USL-SPE-DSLLME method were optimized with the aid of chemometric approaches. First, in screening experiments, fractional factorial design (FFD) was used for selecting the variables which significantly affected the extraction procedure. Afterwards, the significant variables were optimized using response surface methodology (RSM) based on central composite design (CCD). Under the optimum conditions, the enrichment factors were 6890-8830. The linear range was 0.025-625 ng g(-1) and limits of detection (LODs) were between 0.012 and 0.2 ng g(-1). The relative standard deviations (RSDs) were in the range of 4.06-8.9% (n=6). The relative recoveries of OPPs from different soil samples were 85-98%.

Elsevier B.V

Ahmadi,K., Abdollahzadeh,Y., Asadollahzadeh,M., Hemmati,A., Tavakoli,H., Torkaman,R.

Department of Petroleum Engineering, Faculty of Engineering, South Tehran Branch, Islamic Azad University, P.O. Box 11365-4435, Tehran, Iran.; Arian Tajhiz Azma Company, Tehran, Iran.; Department of Petroleum Engineering, Faculty of Engineering, South Teh

20150204

http://vp9py7xf3h.search.serialssolutions.com/?charset=utf-8&pmid=25770621

2015