Method Of GC/MS Developed For Survey On Organic Contaminatants In Groundwater

In recent years, amount of organic solvents and pesticides are used with therapid development of modern industry and agricultural, the leak of petroleum is madeduring the oil field exploitation, the leakage of the landfill leachate is presented. Allabove factors made the organic pollution in groundwater more and more seriously.They also made organic pollutants more complex and theirs concentrations higher.The pollution of groundwater affects human health directly and become the concernof government and public. The organic pollution of groundwater is an environmentalproblem that cannot be ignored. It is critically important and significant formonitoring and preventing the pollution of groundwater to understand thegroundwater pollution status. And it can also provide scientific gist for the relativelaw constituting. The analytical technique of organic compounds in groundwater is thekey bottleneck technique.GC/MS can provide abundant information about organic compound structuresand has super qualitativety. It is extremely meaningful for findng the organicpollutants in groundwater. And it can qualitatively and quantitativly analyses thetarget compounds with high sensitivity and good selectivety.Based on USEPA methods for analysis drinkingwater and others publishedoutside of China, we describe in this report a set of analytical methods for use innon-target monitoring and target monitoring for volatile organic compounds ingroundwater. Purge and Trap(P&T) combine with GC/MS to form the entireanalytical instrument system. The calibration curves of the methods are in goodlinearity. The limit of detection of the analytical methods could extend to 10-8g/L.Organochlorine pesticides (OCPs) and polycyclic aromatic hydrocarbons (PAHs)have been selected as studying objectives. The methods for non-target determinationand target determination of trace semi-volatile organic compounds (SVOC) have beendeveloped using C18-solid-phase membranes extraction and gas chromatography/massspectrometry. The calibration curves of the methods are in good linearity. The limit ofdetection could extend to 10-9g/L and 10^-11g/L .The organic compounds samples from Beijing suburban areas have beenanalyzed by applying the analytical methods created and defined in this thesis. Theresults indicated that the main volatile organic pollution in Beijing areas groundwateris the halogen hydrocarbon. The highest concentration of trichloroethylene was730.0μg/L. The highest concentration of tetrachloroethylene was 243.6μg/L. the mainsemivolatile organic pollution in Beijing areas groundwater are the phenyl groups andpolycyclic aromatic hydrocarbons. Ester, alcohol, acid, hydroxybenzene, halogenhydrocarbon, phenyl groups, alkene, hydrocarbon and polycyclic aromatichydrocarbons were identified in these samples. The kinds of the pollutants were over150.The concentrations of organochlorine pesticides ranged from no detection to31.3ng/L. The concentrations of polycyclic aromatic hydrocarbons ranged from nodetection to 62.7ng/L.In this thesis, the methods for conducting research and monitoring the organicpollution in groundwater in China have been established. The background referenceof organic compounds has also been provided in Beijing groundwater. All of thosewill help to pave the foundation for further studies on organic pollution ingroundwater in the future.