Study on Accelerated Solvent Extraction of n-Alkanes in Marine Sediments
  
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DOI:10.3969/j.issn.1004-4957.年份.月份
KeyWord:accelerated solvent extraction  n-alkanes  marine sediments
  
AuthorInstitution
LI Xiao-lin,HE Xing-liang,LI Feng,ZHANG Yuan-yuan,CHEN Li-lei,ZHANG Pei-yu 1.国土资源部海洋油气资源和环境地质重点实验室;2.青岛大学环境科学与工程学院;3.中国海洋大学化学化工学院
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Abstract:
      The paper described the determination of n-alkanes in marine sediments by gas chromatography mass spectrometry with accelerated solvent extraction(ASE)for sample pretreatment.The main factors which affect the extraction yield of n-alkanes by ASE,such as proportion of extractant,temperature,static time and cycle times were discussed.The following conclusions were obtained from the study:when the long carbon chain n-alkanes need to be detected or are higher in samples,methanol-methylene chloride(1∶3,by volume)is recommended to used as the extraction solvent.Methanol-methylene chloride(1∶9,by volume)could be used as the extraction solvent while the short carbon chain n alkanes need to be detected or are higher in samples.The quantities of short and long carbon chain n-alkanes and the total n-alkanes gradually increases with increasing of the temperature,static time and number of cycles.The optimum parameters for n-alkanes extraction from marine sediments were as follows:temperature:150 ℃,static time:15 min and cycle times:3 cycles.The RSD of method ranged from 3% to 14%,except for C15 (20%).Alternatives recoveries were in the range of 84%-114%.With the advantages of practicality,reliability,easy operation,low reagent consumption and good precision,the method is suitable for the quantification of marine sediments samples with complicated matrices.
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