Titration with a standardized solution of aluminium containing a stoichiometric excess of potassium ions in the presence of ammonium hydrogen difluoride at ~pH3; giving an exothermic reaction with the formation of insoluble NaK2AlF6. 瑞士萬通859 溫度滴定儀 瑞士萬通862多位滴定儀 瑞士萬通 848 Titrino plus自動電位滴定儀 905/907 愛智能 系列全自動電位滴定儀