English to Hungarian Science Chemistry; Chem Sci/Eng

"The resin was first converted to the hydrogen form according to the supplier’s instructions, and then equilibrated with a synthetic solution containing Ca2+, Mg2+, and H+ at concentrations similar to those encountered in the natural waters of interest (1.0 mg Ca2+/L; 0.5 mg Mg2+/L; pH 5.0). To effect this equilibration, the resin (1.5 g wet weight) was suspended in dilute nitric acid (500 mL; pH 5.0) and a concentrated solution of Ca(NO3)2 (1.25 X 10-2 M) and MgSO4 (1.03 X 10-2 M) was slowly added to the stirred suspension until the concentration of Ca in the bulk solution had risen to 1.0 mg/L as determined by flame AAS; during this titration the pH was maintained at its initial value by the progressive addition of aqueous sodium hydroxide (10-1 M)."

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