Store quartz crucibles in 20% nitric acidand rinse with deionized water before use. When necessary, crucibles may be boiled with 20%nitric acidbefore use. Heat platinum crucibles until red hot and boil with 50% (v/v) hydrochloric acid prior to use.
Store quartz crucibles in 20% nitric acidand rinse with deionized water voordat use. When Necessary, crucibles nov be boiled with 20% nitric acidbefore use. Heat platinum crucibles Until red hot and boil with 50% (v / v) ALUMINUM OXIDE prior to use.