GC-FID based analysis of trace phthalates with a novel nanocomposite by polar-nonpolar properties in plastic bottled water

Abstract

Abstract Risk of emerging contaminants such as phthalates in drinking water and food are concerned due to adverse effect of these chemicals. Release of phthalates as a plastics additive from bottles to drinking water is a source of risk. On the other hand, trace level determination of phthalates in plastic bottled samples is a hurdle in risk assessment. A dispersive solid phase extraction (DSPE) with polar-nonpolar properties adsorbent was prepared for trace analysis of di (2-ethylhexyl) phthalate (DEHP), dimethyl phthalate (DMP), diethyl phthalate (DEP). Adsorbent consisted of magnetic nano silica aerogel (MSi) coated by CuO ROD (CuR) which was supported ionic liquid (IL). Produced MSi@CuR@IL was characterized by SEM, VSM, BET, EDS, FTIR, C/H/N elemental analysis and TGA. In DSPE method, the effect of adsorbent amount, time of sample absorption and suspension speed were optimized based on the central composite design (CCD). Optimized condition was evaluated in 24 mg MSi@CuR@IL, sample absorption time of 14 min at pH = 6.2 by suspension speed of 700 RPMI. Using optimized method suitable performance was presented including detection limit of 0.78 to 1.25 µg/L, phthalate recovery of 92.21 to 102.12, linear rage of 3 to 200 µg/L and repeatability by RSD% of < 10%. Evaluated DSPE was performed in 10 plastic bottled water between 8.9 to 195.3 µg/L. In conclusion application of a potent adsorbent prepare a simple, sensitive and rapid DSPE for phthalate detection by gas chromatography with flame ionization detector (GC-FID) as a commercial technique.