Study On Method And Application For Analysis Of Short Chain Chlorinated Paraffins In Marine Environment

Short chain chlorinated paraffins (SCCPs) are new persistent organic pollutants (POPs)listed in the Stockholm Convention. SCCPs, n-paraffins that have a carbon chain length of between 10 and 13 carbon atoms and a proportion of chlorination of between 30% and 70% by weight,are used widely in textile materials, flame retardant, metal processing lubricant, and so on. During production and application of products mentioned above, a great amount of SCCPs would be released into the environment and make serious pollution. Although lacking SCCPs’research data, researchers and scholars are still exploring untiringly in fields of SCCPs’management, environment pollution and protection, and risk control in China, one of the members of the Stockholm Convention.It is of great significance to establish the analysis method of SCCPs and monitor in the environment.In this paper, the analysis method of SCCPs in the seawater is firstly established in China, applying the C18 solid-phase extraction (SPE) membrane to extract SCCPs and using GC/ECNI-MS to determine SCCPs in the sea.With this analysis method, the experiment result shows that the recovery ratio of SCCPs in seawater ranges from 69.5% to 97.5%, and the relative standard deviation (RSD) is 13.7%, which are both higher than the results using of alternative internal standard,with recovery ratio ranging from 70.2% to 93.7%RSD measuring 11.6%. The detection limit of the method is between 65 and 180μg/L. In addition, a microwave-assisted extraction method coupled with GC/ECNI-MS was used to determine SCCPs in sediments and marine organisms. Similarily, the recovery ratio ranges from 58.4% to 91.6% and the RSD is 15.4%, and both data rises to 60.2% to 85.4% for the range of recovery ratio and 12.9% for the RSD, when using alternative internal standard,the.. In a word, the method is suitable for the analysis of SCCPs in seawater, sediments and marine organism, and the experiment results are satisfying.The results of experiments also show that the content of SCCPs, whose main components are congeners of SCCPs with 10 to 13 carbon atoms and 6 to 8 chlorine atoms (C10-13-Cl6-8-SCCPs) in seawater,reaches moderate pollution level, while the content of SCCPs, whose main components are C10-11-CI5-6-SCCPS in sediments and marine organisms, reaches higher pollution level. At the same time, it is discovered that in C10-11-Cl5-6-SCCPs, the percentage of congeners reduces as the number of carbon and chlorine atom increases. As for the geographic diversity, the pollution level of SCCPs in Bohai Sea is slightly lower than that in East and South China Sea, just like the distribution characteristics of congeners in crustaceans.According to what has been discussed above, the analysis methods for seawater, sediments and marine organisms presented in this paper can be used in monitoring SCCPs in marine environment in order to provide technical support for marine bioaccumulation, environmental behaviour and other subsequent study about SCCPs.