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perfluorononanoic acid pfna synthetic perfluorinated carboxylic fluorosurfactant environmental contaminant pfos pfoa conjugate base salt surfactant fluoropolymer polyvinylidene fluoride fluorotelomer olefin surface tension perfluorinated alkylated substances 3d cleansing hydrophilic hydrophobic biodegradation bioaccumulating biomagnification biomagnify toxic pollutant pollution damage compound component agent stuff reagent functional group synthesis