Determination of Six Isophthalate Esters in Plastic Toys by Gas Chromatography-Mass Spectrometry with Solid Phase Extraction
  
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KeyWord:solid phase extraction(SPE)  gas chromatography-mass spectrometry(GC-MS)  plastic toys  isophthalate esters
  
AuthorInstitution
LI Chang-yu,HU Dan,YANG Kai,WU Zhi-hui,LIAO Shang-fu Zhejiang Fangyuan Test Group Co.,Ltd.
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Abstract:
      A method for the determination of six isophthalate esters in plastic toys,including dimethyl isophthalate,diethyl isophthalate,diallyl isophthalate,bis(2-ethylhexyl) isophthalate,diphenyl isophthalate and di-n-octyl isophthalate was established by gas chromatography-mass spectrometry(GC-MS) with solid phase extraction(SPE).The samples were ultrasonically extracted with ethyl acetate,precipitated with methanol and purified with an HLB solid phase extraction column,then the analytes were separated on an HP-5MS column(30 m×250 μm×0.25 μm),detected in selected ion monitoring mode and quantified by external standard method.Results showed that the standard curves for six isophthalate esters were linear over the concentration range of 0.1-5.0 mg/L,with correlation coefficients(r2) greater than 0.995.The detection limits of the method(S/N=3) were in the range of 0.22-0.60 mg/kg,and the spiked recoveries were between 87.3% and 116% with relative standard deviations of 1.5%-9.5%.The method is simple,rapid and sensitive,and is suitable for the determination of isophthalate esters in plastic toys.
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