1. Soluţie pH 7.00, TPL 7, Tehnical Buffer solution, 250 ml, producător WTW = 1 flacon
2.Ammonium standard solution traceable to SRM from NIST NH4Cl in H2O, Ammonium solution etalon 1000 mg/l NH4, Certipur®, producător Merck, 500 ml./flacon = 1 flacon
3.Potassium chloride solution ( nominal 12.8 mS/cm), (c=0.1 mol/l) certified reference material for mesurement of electrolytic conductivity), Certipur®, producător Merck, 500...
1. Soluţie pH 7.00, TPL 7, Tehnical Buffer solution, 250 ml, producător WTW = 1 flacon
2.Ammonium standard solution traceable to SRM from NIST NH4Cl in H2O, Ammonium solution etalon 1000 mg/l NH4, Certipur®, producător Merck, 500 ml./flacon = 1 flacon
3.Potassium chloride solution ( nominal 12.8 mS/cm), (c=0.1 mol/l) certified reference material for mesurement of electrolytic conductivity), Certipur®, producător Merck, 500 ml./flacon= 1 flacon
4.Azotat de cobalt (II) hexahidrat, indigen, 500g./flacon = 1 flacon