Jul 15, 2011 · through a 0.2 µm pore size PTFE (Teflon) filter (Alltech Associates Inc., D eerfield, IL, USA), bromide, acetate and sulfate concentrations were measured using an Dionex ICS -1000 ion chromatograph equipped with a IonPac ® AS22 column, a ASRS ® 300 suppressor, and 4.5 mM