fluoride sensitive electrodes (e.g. Metrohm 6.0502.150)
Ag/AgCI/KCI-reference electrode (e.g. Metrohm 6.0726.100)
pH-meter with mV display (optionally adapter for the electrodes)
3 PE-cups (100 ml) and 3 PE-measuring flasks (100 ml)
magnetic mixer and 3 small PTFE stirrers
Reagents: chromic acid (pure), 50 % solution of SurTec 871 II, 45 %
sodium hydroxide solution