Reflux extraction and analysis of polyethylene wax in soil  

作　　者：熊小莉 CHEN Cheng LUO Xue-gang 

机构地区：[1]College of Chemistry and Materials Science, Sichuan Normal University [2]School of Materials Science and Engineering, Southwest University of Science and Technology [3]Engineering Research Center for Biomass Materials Ministry of Education

出　　处：《Journal of Chongqing University》2014年第4期115-121,共7页重庆大学学报（英文版）

基　　金：Funded by National Eleventh Five-Year Plan Technology Support Program of China(2007BAE42B04);the Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites,Functional Materials of Sichuan Province(10zxfk23);Scientific Research Project of Sichuan Normal University(11KYL06);Key Fund Project of Sichuan Provincial Department of Education(14ZA0027)

摘　　要：An efficient reflux extraction of polyethylene wax(PEW) in soil is presented, followed by molecular structure characterization methods to explore its degradation mechanism. To more realistically simulate the actual degradation of PE film powders in soil, low density PE(M=5 000) powders, being used as simulated PEW residue sample, were uniformly mixed with soil and then recovered by reflux extraction with decahydronaphthalen(decalin) at 90 ?C for 60 min. The average recovery of PEW from fortified soils was 96.5% with the developed reflux extraction procedure. The recovered PEW residue samples were characterized by infrared spectroscopy(IR), element analysis(EA), X-ray fluorescence(XFR), and high-temperature gel permeation chromatography(GPC). The results from spectra analysis show that there were no significant changes in molecular structures and molecular mass distribution of PEW samples after the reflux extraction, which demonstrate the reliability of this method. These results also indicate that the reflux extraction procedure and analytical methods of characterization could serve as a novel measurement technique to evaluate the degradation of low-density PE powders in soil over time.An efficient reflux extraction of polyethylene wax （PEW） in soil is presented, followed by molecular structure characterization methods to explore its degradation mechanism. To more realistically simulate the actual degradation of PE film powders in soil, low density PE （M=5 000） powders, being used as simulated PEW residue sample, were uniformly mixed with soil and then recovered by reflux extraction with decahydronaphthalen （decalin） at 90 ℃ for 60 min. The average recovery of PEW from fortified soils was 96.5% with the developed reflux extraction procedure. The recovered PEW residue samples were characterized by infrared spectroscopy （IR）, element analysis （EA）, X-ray fluorescence （XFR）, and high-temperature gel permeation chromatography （GPC）. The results from spectra analysis show that there were no significant changes in molecular structures and molecular mass distribution of PEW samples after the reflux extraction, which demonslrate the reliability of this method. These results also indicate that the reflux extraction procedure and analytical methods of characterization could serve as a novel measurement technique to evaluate the degradation of low-density PE powders in soil over time.

关 键 词：polyethylene WAX ·reflux EXTRACTION DECALIN SOIL BIODEGRADATION 

分 类 号：X833[环境科学与工程—环境工程]