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Anion and cation concentrations were measured with an ion chromatograph (Thermo Fisher Scientific, Dreieich, Germany) equipped with a Dionex IonPac AS23-4 m column and an AERS 500 suppressor (2 mm) for the measurement of anions using 0.8 mM NaHCO 3 /4.5 mM Na 2 CO 3 (Thermo Fisher Scientific, Dreieich, Germany) as eluent at a flow rate of 0.25 mL/min at 7 mA
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