Nitrate → Strontium nitrate

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In addition, the following method for purifying strontium nitrate is disclosed in U.S. Pat. No. 3,065,052: an aqueous solution of strontium nitrate containing barium impurities is prepared, this solution is gradually adjusted to at least the neutral range with nitric acid, the adjusted solution is mixed with a chromic acid solution to produce a strongly acidic solution, a strontium hydroxide solution is gradually added to the resulting solution containing a nitrate and an acid to adjust the pH to 11 while this solution is agitated, this pH is kept unchanged for several minutes to allow the barium impurities to precipitate as barium chromate, the solution is then filtered to remove the barium chromate, nitric acid is subsequently added to the filtrate to gradually bring the pH to about 1 while the filtrate is boiled, and the filtrate is then evaporated to precipitate strontium nitrate crystals, yielding strontium nitrate having the following average composition: 99.85% Sr(NO3)2, 0.05% Ba(NO3)2, 0.004% NaNO3, Ca(NO3)2 (undetected), and the like.

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