RT info:eu-repo/semantics/article
T1 Dealing with the ubiquity of phthalates in the laboratory when determining plasticizers by gas chromatography/mass spectrometry and PARAFAC
A1 Oca Casado, Mª Leticia
A1 Rubio Martínez, Laura
A1 Sarabia Peinador, Luis Antonio
A1 Ortiz Fernández, Mª Cruz
K1 Phthalates
K1 Plasticizers
K1 Benzophenone
K1 PTV-GC/MS
K1 PARAFAC
K1 Finger peak
K1 Química analítica
K1 Chemistry, Analytic
AB Determining plasticizers and other additives migrated from plastic materials becomes a hard task when these substances are already present in the laboratory environment. This work dealt with this drawback in the multiresidue determination of four plasticizers (2,6-di-tert-butyl-4-methyl-phenol (BHT), diisobutyl phthalate (DiBP), bis(2-ethylhexyl) adipate (DEHA) and diisononyl phthalate (DiNP)) and a UV stabilizer (benzophenone (BP)) by gas chromatography/mass spectrometry (GC/MS) using DiBP-d4 as internal standard. The ubiquity of DiBP by a non-constant leaching process in the laboratory was detected, which could not guarantee the achievement of a trustworthy quantification. To handle this, the assessment of the level of DiBP in solvent blanks having fixed the probabilities of false non-compliance (α) and false compliance (β) at 0.01 was performed. On the other hand, another special case was that of DiNP, in whose chromatogram finger peaks appear because of an array of possible C9 isomers. PARAFAC, used for the identification and quantification of all the substances, is a useful chemometric tool that enabled a more reliable determination of this analyte since no peak areas were considered but chromatographic and spectral loadings.Since phthalates may migrate from rubber latex items, an evaluation of the existence of matrix effects on the determination of the five analytes was conducted prior to an extraction with hexane from a dummy for infants. As matrix effects were present, the quantification of the compounds under study was performed following the standard addition method using PARAFAC sample loadings as response variable. As a result, the presence of BHT was confirmed, being its concentration equal to 37.87 μg L−1. Calibrations based on PARAFAC yielded the following values for the decision limit (CCα): 1.16 μg L−1 for BHT, 1.34 μg L−1 for BP, 1.84 μg L−1 for DEHA and 51.42 μg L−1 for DiNP(for α = 0.05 and two replicates).
PB Elsevier
SN 0021-9673
YR 2016
FD 2016-09
LK http://hdl.handle.net/10259/4259
UL http://hdl.handle.net/10259/4259
LA eng
NO Ministerio de Economía y Competitividad (CTQ2014-53157-R).M.L.
DS Repositorio Institucional de la Universidad de Burgos
RD 11-dic-2024