Trace Level Quantification of Four Cyclic Acetals Odorous Compounds in Water by Use of Headspace SPME Followed by GC-MS
A detection method had been established for trace level analysis of 2,2-dimethyl-1,3-dioxolane(22-DMD),2-ethyl-4-methyl-1,3-dioxolane(2-EMD),2-ethyl-2-methyl-1,3-dioxolane(2E2MD),2-ethyl-5,5-dimethyl-1,3-dioxane(2-EDD),totally four cyclic acetals odorous compounds in water by use of headspace SPME followed by GC-MS.In SPME pretreatment period,85 μm Carboxen/PDMS fiber was selected,the extraction was performed on 60 ℃ for 25 minutes,the concentration of salting-out agent NaCl was 20％.In chromatographic process,Agilent DB-5MS column(60 m×0.25 mm×1.00 μm)was applied for component separation.2-isobutyl-3-methoxypyrazine was chosen to be internal standard.The MDLS of 22-DMD,cis-2-EMD,trans-2-EMD,2E2MD,2-EDD were 1.6,0.6,0.5,1.0,0.3 ng/L respectively.The RSDs of target compounds in parallel spiked samples of pure water,raw water,finished water and distribution system water were 1.6％to 8.6％,the recovery rates were 94％to 117％.The method characteristic indices all met the determination requirements of trace level of cyclic acetals compounds in water.
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