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《Chinese Journal of Chromatography》 2006-01
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Analysis of Phthalates in Plastic Food-Packaging Bags by Thin Layer Chromatography

CHEN Hui,WANG Yuan,ZHU Ruohua(Department of Chemistry,Capital Normal University,Beijing 100037,China)  
The method for simultaneous determination of four phthalates,namely dimethyl phthalate(DMP),diethyl phthalate(DEP),di-n-butyl phthalate(DBP) and di (2-ethylhexyl) phthalate(DEHP) in plastic food-packaging bags by thin layer chromatography(TLC) was(developed).The plastic food-packaging bags were extracted with ethanol by ultrasonication,then the mixture was filtrated through membrane(0.45 μm).The mixture of ethyl acetate-(anhydrous)(ether-isooctane)(1∶4∶15,v/v) was used as developing agent on the TLC silica gel plate for development.The filtered liquid was spotted on the TLC plate dealt by acetone,and detected with scanning wavelength of 275 nm and reference wavelength of 340 nm.The qualitative(analysis) of the phthalates was performed using the R_f values of the chromatogram.The quantitative analysis was performed with external standard method.Good linearities were(obtained) for DMP,DEP,DBP and DEHP.The detection limits were 2.1 ng for DMP,2.4 ng for DEP,3.4 ng for DBP and 4.0 ng for DEHP.The relative standard deviations(RSDs) of the four phthalates were 2.8%-3.5%.The recoveries of the four phthalate standards in real sample were 78.58%-111.04%.The method presented has the advantages of high precision,high(sensitivity),small sample size,and simple pretreatment.The method was used to detect the four phthalates in the food-packaging bags.The contents in real samples were close to the(results) by gas chromatography.
【CateGory Index】: TS206
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