Journal
TALANTA
Volume 195, Issue -, Pages 236-244Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2018.11.049
Keywords
Phthalic acid esters; Metal-organic frameworks; Water samples; Dispersive solid-phase extraction; Liquid chromatography mass spectrometry
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Funding
- Canary Agency of Economy, Industry, Trade and Knowledge (ACIISI, Spain) of the Canary Islands' Government
- Ministry of Economy and Competitiveness of Spain [CTQ2014-57195-P]
- Fundacion CajaCanarias [2016TUR07]
- European Social Fund
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In the present work, a commercial metal-organic framework (Basolite (R) F300) has been applied for the first time as dispersive solid-phase extraction (dSPE) sorbent of eight phthalic acid esters (PAEs) (butyl benzyl phthalate, bis-2-n-butoxyethyl phthalate, bis-isopentyl phthalate, bis-n-pentyl phthalate, dicyclohexyl phthalate, di-(2-ethylhexyl) phthalate-DEHP-, di-n-octyl phthalate and diisononyl phthalate) and an adipate (bis (2-ethylhexyl) adipate), which is utilized as a PAE substitutive. Milli-Q, pond, tap and waste water were selected as samples. Dihexyl phthalate-3,4,5,6-d(4) was used as procedural internal standard. High-performance liquid chromatography mass spectrometry was used for the determination of the target compounds. Optimum dSPE conditions were the following: 50 mL of the water sample (pH 6.0), 120 mg of sorbent and 15 mL of ACN as elution solvent. For the validation of the method, matrix-matched calibration and trueness of the method were addressed, obtaining determination coefficients (R-2) higher than 0.9905 and relative recovery values between 70 and 118 % (RSDs < 20 %). The limits of quantification of the method were in the range 22-69 ng/L. Matrix effects were also studied. Different real samples were analysed, finding DEHP in all of them at the low mu g/L level.
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