Polymer phase transition characteristics coupled with GC‐MS for the determination of phthalate esters

Abstract

Phthalate esters are easily released from plastics materials and migrate into the soil and water environment, causing serious pollution and posing a great threat to the health of human beings. A novel temperature‐sensitive extractant combined with liquid–liquid microextraction was developed to preconcentrate three phthalates in the water environment. To optimize the extraction efficiency for the three phthalate esters, various parameters, including polymer molecular weight, salt type, salt addition, adsorption time, desorption solvent, desorption volume, and desorption time have been studied. Under optimal conditions, limits of detection and limits of quantification were in the range of 0.007–0.120 and 0.021–0.350 µg/L, respectively. Linearities varied in the range of 5–1000 µg/L, with the correlation coefficients of 0.9867–0.9997. The preconcentration factors were in the range of 25–75. The relative recoveries of the three phthalate esters were in the range of 82.2–105.6% at the spiked levels. The relative standard deviations were in the range of 0.7–9.2% based on triplicate measurements. The results indicate that the temperature‐sensitive material is a good extractant for phthalate esters in water samples.

Fabrication of magnetic covalent organic framework for efficient extraction and determination of phthalate esters in milk samples

“…To sensitively determine PAEs, the high efficient extraction from complex matrices is an essential step for making breakthroughs. Recently, extraction of PAEs in food samples often employs liquid‐liquid extraction [9], dispersive liquid‐liquid microextraction [10], accelerated solvent extraction [11], SPE [12], SPME [13], magnetic solid‐phase extraction (MSPE) [14] prior to GC‐MS analysis. Compared with other extraction methods, MSPE is more time‐saving, solvent‐saving, and easy to operate.…”