Study On The Determination Of Phthalic Acid Esters (PAEs) In Marine Sediments And Its Application

With the development of technology and the extensive use of plastic products, phthalic acid esters(PAEs) which are extensively used in plastic materials as the additive are easily released into the environment and then transfer into the marine ecosystem by atmospheric deposition,sewage discharge and other approaches.PAEs participate in the recycle of marine geochemistry.Marine sediment is the integrated products in the marine environment.It is essential to develop an accurate method to detect PAEs of marine sediments.The thesis contains four chapters.The first part is a summary of the background information on PAEs research,including the toxicity,applications in material science, and the progresses of PAEs measurement.And the aim of this study was made at the end of this part.The second part of this work is to design a rapid and accurate procedure to measure 16-PAEs with solid-phase-extract(SPE) purification and gas chromatography-mass spectrometry(GC-MS) detection after extensively optimization of PAEs from sample matrices,eluting the analytes from the SPE column,and operating conditions for GC-MS.In the third part,developed analytical method in ChapterⅡwas applied to measure PAEs in sediment samples collected at Jiulongjiang estuary.The distribution and geochemical characteristics of Jiulongjiang estuary were described with obtained analytical results.The last Chapter is the conclusion of this work.The prospects for further investigate of this study were also proposed in this section.This thesis is aimed to develop an appropriate procedure to accurately detect 16-PAEs in marine sediment.After carefully investigation,the method was as following,ultrasonic extracted by dichloromethane with constant temperature at room temperature,purified by silica gel SPE column and eluted by 10mL ethyl acetate,and then qualitatively and quantitatively measured by GC-MS.The analytical performance of developed method was 0.011μg·g^-1(DnOP) to 0.80μg)·g^-1(DIDP, DDcP) for limit of detection(LOD,3S/N),74.4%(DINP) and 118.1%(DUP) for standard added recoveries,and less than 10%for relative standard deviation(RSD, 0.25μg·g^-1) with an exception of 17.8%for DMP.A good method which can be used in marine geochemical research is the contribution of this work.