Preparation of a Novel Restricted Access Material Combined to Core-Shell Magnetic Molecularly Imprinted Polymers for Determination of Dimethyl phthalate in Soils

• Published in: Soil & sediment contamination 2019-08, Vol.28 (6), p.529-546
• Main Authors: Zuo, Haigen, Lin, Yusuo, Ma, Xinxin, Feng, Yanhong, Luo, Qiuhong
• Format: Article
• Language: English
• Subjects: Access; Acetone; Core-shell structure; DMP; Gas chromatography; Hydroxyl groups; Imprinted polymers; Iron oxides; Macromolecules; magnetic nanoparticle; Magnetometers; Mass spectrometry; Mass spectroscopy; molecularly imprinted polymer; n-Hexane; Nanoparticles; Phthalates; Polymers; Rams; restricted access material; Soil; Soil structure; Soils
• ISSN: 1532-0383; 1549-7887
• DOI: 10.1080/15320383.2019.1633272

A novel superparamagnetic Fe 3 O 4 surface molecularly imprinted polymers (MIPs) coated with restricted access materials (RAMs) were prepared for the analysis of dimethyl phthalate (DMP) residues in soils. RAM-MIP with core-shell structure was prepared by coated MIP layer on superparamagnetic Fe 3 O 4 nanoparticle, and 3-glycidoxypropyl trimethoxysilane (KH 560) was grafted on the surface to form hydroxyl group so as to block macromolecules accession. RAM-MIPs were characterized by transmission electron microscope (TEM), scan electron microscope (SEM), vibrating sample magnetometer (VSM), thermal analyzer (TA), and others. RAM-MIPs can be magnetically separated from the matrix easily and exhibited efficient adsorption performance for DMP. The residue of DMP in soil was extracted by acetone:n-hexane (1:1, V/V), cleaned up by RAM-MIPs, and determined by gas chromatography-mass spectrometry (GC-MS). The limits of quantification (LOQ, S/N > 10) for DMP in soil samples were confined to 0.04 mg kg −1 . The recoveries and relative standard deviations (RSDs) of DMP spiked at 0.04-0.2 mg.kg −1 were 70.27-80.83% and 2.1-5.7%, respectively. Thus, RAM-MIPs can be successfully applied to the determination of DMP in soil samples.