Detection of 7 Volatile Sulfur Compounds in Plastic Track Surface by Ultrasonic Extraction£­HS£­SPME/GC£­MS Technique

KeyWord:headspace solid phase microextraction£¨HS£­SPME£©  gas chromatography£­mass spectrometry£¨GC£­MS£©  plastic track surface  volatile sulfur compounds£¨VSCs£©

Abstract:

      A gas chromatography£­mass spectrometry£¨GC£­MS£©coupled with ultrasonic extraction and headspace solid phase microextraction£¨HS£­SPME£© was established for the rapid analysis of seven volatile sulfur compounds£¨VSCs£©£¬including dimethyl sulfide£¨DMS£©£¬carbon disulfide£¨CS2£©£¬methyl ethyl sulfide£¨MES£©£¬diethyl sulfide£¨DES£©£¬dimethyl disulfide£¨DMDS£©£¬diethyl disulfide£¨DEDS£©£¬dimethyl trisulfide£¨DMTS£© in plastic track surface£®The HS£­SPME extraction conditions£¬ultrasonic extraction conditions and GC£­MS parameters were optimized£®Under the optimized conditions£¬7 VSCs had good linearities in the range of 5£­500 ng/g for DES and DMDS£¬and 10£­500 ng/g for other five VSCs£¬with correlation coefficients£¨r£© of 0.984 7£­0.998 9£®The limits of detection£¨LODs£¬S/N = 3£© were in range of 0.4£­1.4 ng/g£¬and the limits of quantitation£¨LOQs£¬S/N = 10£© were 1.3£­4.7 ng/g£®The average recoveries at low£¬medium and high spiked levels ranged from 89.6% to 104%£¬with relative standard deviations£¨RSDs£¬n = 6£© of 3.5%£­12%£®The method integrates separation£¬enrichment and injection into one step£¬and is suitable for the routine detection of VSCs in the synthetic surfaces.