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32412. When phosphoric acid is neutralized with sodium hydroxide and the solution tested with sodium cobaltic nitrite, a misleading precipitate is secured unless a considerable excess of acetic acid is added.Zirconium can be removed by ainmonium hydroxide and potassium detected in the filtrate by sodium cobaltic nitrite, after eliminating the ammonium.The best and shortest way of eliminating zirconium prior to testing for potassium by sodium cobaltic nitrite is by throwing the zirconium into a complex ion with tartaric acid and controlling the acidity with sodium hydroxide and acetic acid. 3.4.

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