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Correlation of air-water adsorption coefficient (Kai) and Retardation Factor (accounting solely for air-water adsorption) versus carbon chain length for a homologous series of sodium perfluoroalkyl carboxylates. A Kai value for PFOS is included for comparison. Kai values are calculated for [PFAS] = 1 mg/L. Representative values measured for the 0.35-mm sand are used to calculate R (θw = 0.23; Aia = 73 cm−1). Regression equation: log Kai = 0.56 ∙ Cn - 7.5, r2 = 0.996.
