Citation: CAI Ming-Gang, DENG Heng-Xiang, HUANG Peng, KE Hong-Wei, ZHENG Xue-Hong, LI Wen-Quan. Simultaneous Determination of Chlorofluorocarbons and Sulfur Hexafluoride in Seawater Based on a Purge and Trap Gas Chromatographic System[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(7): 1003-1008. doi: 10.11895/j.issn.0253-3820.160089 shu

Simultaneous Determination of Chlorofluorocarbons and Sulfur Hexafluoride in Seawater Based on a Purge and Trap Gas Chromatographic System

1.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China;
2.
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China

Received Date: 2 February 2016
Revised Date: 25 March 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 40976113, 41076133, 91228202)

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Chlorofluorocarbons (CFCs) and sulfur hexafluoride (SF₆) are kinds of anthropogenic halogenated compounds. They are very important for the ocean processes including air-sea exchange, water mass exchange etc. Meanwhile, they can be used to calculate some key physical and biogeochemical parameters such as AOUR (apparent oxygen utilization rate) and Cant (anthropogenic CO₂). In comparison with CFCs, it is quite difficult to measure SF₆ in the seawater due to its low solubility. However, it is useful to study the oceanic processes based on both the CFCs and SF₆. In this study, a purge and trap gas chromatographic system was developed to measure the CFC-12 and SF₆ simultaneously in seawater. The optimum conditions were as follows:trap temperature of -70℃, purge time of 8 min, purge gas pressure of 310 kPa, desorption time of 30 s, and desorption temperature of 90℃. The detection limit of CFC-12 and SF₆ were 0.02 pmol/kg and 0.03 fmol/kg, respectively. The analytical precisions of CFC-12 and SF₆ were ±1.2% and ±0.5%, respectively. The correlation coefficients (R²) of all the calibration curves were greater than 0.9995. This method was successfully used in the analysis of the samples collected from 6th Chinese Arctic Research Expedition.
- Sulfur Hexafluoride,
- Chlorofluorocarbons,
- Purge and trap,
- Gas chromatography,
- Seawater
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