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The most exasperating obstacles for determining traces of nitrogen in refractory metals and alloys are the inability to dissolve appropriate weights of solid pieces of metal and relatively high blanks. Potassium dichromate, in conjunction with phosphoric and hydrofluoric acids, was found to be an effective combination for the rapid dissolution of up to 5-gram pieces of various refractory metals. Potassium dichromate can be prepared by purification of potassium chromate from an alkaline medium sothat blanks generally are below 0.5 pg of nitrogen.

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