title: Dispersive solid-phase extraction using polyaniline-modified zeolite NaY as a new sorbent for multiresidue analysis of pesticides in food and environmental samples.
abstract: The applicability of polyaniline (PANI)-modified zeolite NaY as a sorbent for multi-class pesticides extraction was investigated. The sorbent had a sorption capacity of 833mgkg-1sorbent and preconcentration factor of 42 in the mixture of twenty pesticides. The PANI-coated zeolite NaY was successfully created via oxidative polymerization of aniline onto the surface of the zeolite. The sorbent was applied for dispersive solid phase extraction (DSPE) of commonly used pesticides belonging to five different chemical groups, involving carbamate, organophosphate, sulfonylurea, pyrethroid and neonicotinoid. The coupling of DSPE and HPLC-PDA resulted in an efficient method for multiresidue analysis of pesticides. The proposed method gave LODs and LOQs in the ranges of 0.001-1.00mgL-1and 0.005-2.50mgL-1, respectively. The method was applied for determination of pesticide residues in environmental and food samples including drinking water, pond waters, soils, honey, cabbages, cucumbers, tomatoes and strawberries which were collected in Khon Kaen Province, Thailand. Recoveries of the target pesticides were in the range of 64-128% with RSDs less than 12% using matrix matched calibration for all sample matrices. Eight pesticides were found in fruit and vegetable samples at concentrations of 0.003-0.033mgkg-1whereas a few compounds in contaminated pond waters have concentrations of 0.046-0.092mgL-1. The occurrence of high concentration of up to 1.26mgkg-1in the soil samples is noteworthy.
authors.affiliation: Materials Chemistry Research Center, Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.
authors.forename: Prapha
authors.initials: P
authors.lastname: Arnnok
authors.affiliation: Department of General Science, Faculty of Science and Engineering, Kasetsart University, Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon 47000, Thailand.
authors.forename: Nopbhasinthu
authors.initials: N
authors.lastname: Patdhanagul
authors.affiliation: Materials Chemistry Research Center, Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. Electronic address: rodjbu@kku.ac.th.
authors.forename: Rodjana
authors.initials: R
authors.lastname: Burakham
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D004777:Environment; D005504:Food Analysis / Q000379:methods*; D005506:Food Contamination / Q000032:analysis; D006722:Honey / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D010573:Pesticide Residues / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification*; D052616:Solid Phase Extraction / Q000379:methods*; D013997:Time Factors; D017641:Zeolites / Q000737:chemistry*
chemical_list: D000814:Aniline Compounds; D010573:Pesticide Residues; C416807:polyaniline; D017641:Zeolites
keywords: Multiresidue analysis; Pesticide; Polyaniline-modified zeolite; Solid phase extraction