Studied On The Determination Of The Perfluorooctanoic Acid And Perfluorooctane Sulfonate In Textiles

Perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) and their salts have been widely used in industry as surfactants; they are used as water and oil repellants in the treatment of fabrics and leather and in the production of floor waxes and waxed paper. The chemical properties of PFOS and PFOA are stable which has persistent and bioaccumulative and a variety of toxic. It serious does harm to human health and their living environment. PFOS and PFOA have become a new type of persistent oranic pollutants which were paid increasing attention following oranochlorine pesticides, PCBs and dioxins. It has received extensive attention from all over the world.In order to curb the pollution of PFOS, the European Union (EU) , the United States, Canada, Sweden and other developed countries have enacted laws and regulations. Detection and analysis of PFOS and PFOA has also become a hot spot of today's analysis secience. However, the testing standard of PFOS and PFOA in textiles has not developed yet. A method of simultaneous determination of PFOA and PFOS in textiles has been developed in this paper.In this paper, three kinds of commonly used PFOS and PFOA monomer (perfluorooctane sulfonamide, N-ethyl perfluorooctane sulfonamide, perfluorooctanoic acid) were choosed as the object of study under the class perfluorocarbons surfactant composition of commonly used PFOS and PFOA in textiles. The gas chromatography analysis method of PFOS and PFOA in the textiles has been also focused.In the first of sample pretreatment research, the feasibility of determinate FPOA has been analyzed by texting derivatives of PFOA. The specific parameters of derivative test was defined by studying derivatization temperature, derivatization time and volume ratio of derivatization reagent.Secondly, the extraction method of PFOS and PFOA in the textiles has been studied. Two kinds of application extraction methods were proposed which were ultrasonic extraction and microwave extraction.The best extraction conditions were ensured through using extractant screening experiment, orthogonal design, and simple factor design experiments.In the detection method research, GC-ECD method was chosed to study three kinds of PFOS and PFOA monomers by gas chromatography analysis which was based on electron capture detector (ECD) of higher response to organic fluoride and equipment at low prices. Finaly three kinds of target compounds have been separated effectively and determined quantitatively by optimizing the parameters of instrument.The research result indicated that the recoveries of spiked samples were 92.19～102.99% and the detection limits of method were 0.00274～0.02319μg/g and the precisions were less than 10%. In addition, the peak area value has been changed little and the retention time is stable. It illustrated the method was sensitive, rapid, low cost and high recovery and could be used to the determination for the trace amount of PFOA and PFOS in textiles.