title: Potentialities of polyurethane foams for trace level analysis of triazinic metabolites in water matrices by stir bar sorptive extraction.
abstract: Polyurethane (PU) foams were applied for stir bar sorptive extraction of five triazinic metabolites (desethyl-2-hydroxyatrazine, desisopropylatrazine, desethylatrazine, 2-hydroxyatrazine and desethylterbuthylazine) in water matrices, followed by liquid desorption and high performance liquid chromatography with diode array detection (SBSE(PU)-LD/HPLC-DAD). The optimum conditions for SBSE(PU)-LD were 5h of extraction (1000 rpm) and 5% (v/v) of methanol for the analysis of desethyl-2-hydroxyatrazine and 2-hydroxyatrazine, 15% (w/v) of sodium chloride for the remaining compounds and acetonitrile as back-extraction solvent (5 mL) under ultrasonic treatment (60 min). The methodology provided recoveries up to 26.3%, remarkable precision (RSD<2.4%), excellent linear dynamic ranges between 5.0 and 122.1 microg/L (r(2)>0.9993) and convenient detection limits (0.4-1.3 microg/L). The proposed method was applied in the analysis of triazinic metabolites in tap, river and ground waters, with remarkable performance and negligible matrix effects. The comparison of the recoveries obtained by PU and commercial stir bars was also performed, where the yields achieved with the former were up to ten times higher proving that PU is appropriate for analysis at trace level of this type of polar compounds in water matrices.
authors.affiliation: University of Lisbon, Faculty of Sciences, Chemistry and Biochemistry Department, Campo Grande Ed. C8, 1749-016 Lisbon, Portugal.
authors.forename: Fátima C M
authors.initials: FC
authors.lastname: Portugal
authors.forename: Moisés L
authors.initials: ML
authors.lastname: Pinto
authors.forename: João
authors.initials: J
authors.lastname: Pires
authors.forename: J M F
authors.initials: JM
authors.lastname: Nogueira
mesh_terms: D005591:Chemical Fractionation / Q000379:methods*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D016014:Linear Models; D011140:Polyurethanes / Q000737:chemistry*; D015203:Reproducibility of Results; D045483:Rivers / Q000737:chemistry; D014227:Triazines / Q000032:analysis* / Q000737:chemistry; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D011140:Polyurethanes; D014227:Triazines; D014874:Water Pollutants, Chemical; D014867:Water; C028279:polyurethane foam