Development Of Pretreatment Methods For PFOS In Textiles And Determination By Gas Chromatopraphy-Mass Spectrometry

Perfluorooctane sulfonate (PFOS) was a kind of compounds which closely related to humans and played an important role in human life. But PFOS had been confirmed that it did harm to human and caused the environment pollution, and it had serious toxicity to human body health. Therefore, in order to protect human health and keep the living environment safety, the test of PFOS was very impossible.The textiles matrix was very complex because of finishing process. Therefore, the study of textile samples pretreatment methods had been the key to the purification and enrichment of target in textiles, and it also was the bottleneck to detection of harmful substances in textiles. Perfluorooctane sulfonate was used as object in this paper and two kinds of different samples pretreatment methods were used to extract PFOS, and then the quantitative was detected by gas chromatography-mass spectrometry (GC/MS). The main research was giving as follows:1Dispersive solid phase extraction (Dispersive-SPE) technique was firstly used to extract PFOS from textiles. A silylation step was then carried out for the extract by adding BSTFA (N,O-Bis (trimethylsilyl) trifluoroacetamide). The silylated PFOS were identified and quantified by GC/MS. Under the optimum condition, the recovery was80.7%-106%and the precision was7.1%. The result showed that this method was fast、easy and low cost.2Ionic liquid (1-ethyl-3-methylimidazolium acetate ionic liquids ([Emim]Ac)) water solution was firstly used as extraction solvent to extract PFOS from textiles. The extract was then reacted with BSTFA. The silylated PFOS were identified and quantified by GC/MS. Under the optimum condition, the recovery of PFOS was71.98%-101.0%and the relative standard deviation (RSD) was11.7%. Because of ionic liquid had the advantage of repeated use, this paper also researched the reuse of ionic liquid, draw the ionic liquid can reuse for5times. The results showed that the traditional organic solvents could be replaced by ionic liquid which avoided causing secondary pollution to the environment.