title: Comparison of solidification of floating drop and homogenous liquid-liquid microextractions for the extraction of two plasticizers from the water kept in PET-bottles.
abstract: Two approaches based on solidification of floating drop microextraction (SFDME) and homogenous liquid-liquid microextraction (HLLE) were compared for the extraction and preconcentration of di-(2-ethylhexyl) phthalate (DEHP) and di-(2-ethylhexyl) adipate (DEHA) from the mineral water samples. In SFDME, a floated drop of the mixture of acetophenone/1-undecanol (1:8) was exposed on the surface of the aqueous solution and extraction was permitted to occur. In HLLE, a homogenous ternary solvent system was used by water/methanol/chloroform and the phase separation phenomenon occurred by salt addition. Under the optimal conditions, the LODs for the two target plasticizers (DEHA and DEHP), obtained by SFDME-GC-FID and HLLE-GC-FID, were ranged from 0.03 to 0.01 microg/L and 0.02 to 0.01 microg/L, respectively. HLLE provided higher preconcentration factors (472.5- and 551.2-fold) within the shorter extraction time as well as better RSDs (4.5-6.9%). While, in SFDME, high preconcentration factors in the range of 162-198 and good RSDs in the range of 5.2-9.6% were obtained. Both methods were applied for the analysis of two plasticizers in different water samples and two target plasticizers were found in the bottled mineral water after the expiring time and the boiling water was exposed to a polyethylene vial.
authors.affiliation: Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, Tehran, Iran. yyamini@modares.ac.ir
authors.forename: Yadollah
authors.initials: Y
authors.lastname: Yamini
authors.forename: Mahnaz
authors.initials: M
authors.lastname: Ghambarian
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Khalili-Zanjani
authors.forename: Mohammad
authors.initials: M
authors.lastname: Faraji
authors.forename: Shahab
authors.initials: S
authors.lastname: Shariati
mesh_terms: D000272:Adipates / Q000302:isolation & purification*; D005591:Chemical Fractionation; D004051:Diethylhexyl Phthalate / Q000302:isolation & purification*; D018857:Food Packaging; D010968:Plasticizers / Q000302:isolation & purification*; D011093:Polyethylene Terephthalates / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D000272:Adipates; D010968:Plasticizers; D011093:Polyethylene Terephthalates; D014867:Water; C013966:dioctyl adipate; D004051:Diethylhexyl Phthalate