Analysis of Volatile Organic Compounds in Oilfield Brines from the Nanyishan Area of the Qaidam Basin
There are abundant inorganic salt resources in the oilfield brines of the Nanyishan Area,in the Qaidam Basin.However,the high content of organic matter in oilfield brines may cause adverse effects on the development and utilization of the brine resources.Volatile organic compounds(VOCs)commonly ex-ist in oilfield brines.Investigation of VOCs can help comprehensively understand the compositions and fea-tures of organic components in oilfield brines.In this paper,a single factor analysis procedure was used to establish a non-targeted analysis method for analyzing the compositions of VOCs in oilfield brines from the Nanyishan Area by optimizing the experimental conditions of headspace solid phase microextraction.There were significant differences in the non-targeted extraction effects on the four extraction fibers of VOCs in oilfield brines.The extraction efficiency of 50/30 μm Divinylbenzene/Carboxen/Polydimethylsiloxane(DVB/CAR/PDMS)was the best,followed by 75 μm CAR/PDMS,65 μmPDMS/DVB and 100 μm PDMS.Based on the total peak area and peak numbers of the extracted VOC components,the optimal extraction conditions were as follows:50/30 μm DVB/CAR/PDMS extraction fiber,extraction temperature of 80℃,incubation time of 30 min,extraction time of 50 min,and desorption time of 3 min.A total of 56 VOCs were detected in the oilfield brines,mainly including benzene series,alkanes,polycyclic aromatic hydrocarbons and some heteroatom-containing compounds.The results can enrich the knowledge of the compositions of organic matter in oilfield brines from the Nanyishan Area,and provide basic data for the effective treatment or removal of organic matter in oilfield brines in this area during the comprehensive utilization process of oilfield brines.It can also provide reference for the analysis of VOCs in oilfield brines from other areas.
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