Determination of nitrite in phosphating solutions

Details Determination of nitrite in phosphating solutions Determination of nitrite in phosphating solutions

G - Physics

01

N

G01N 31/16 (2006.01) C23C 22/07 (2006.01) G01N 27/26 (2006.01)

Patent

CA 2058107

ABSTRACT OF THE DISCLOSURE: For a determination of nitrite in aqueous phosphating solutions which contain simple and/or complex fluorides, a bath sample of the phosphating solution is acidified with sulfuric acid, nitric acid and/or perchloric acid and in the presence of aluminum ions in a molar surplus of at least five times over the fluoride content of the phosphating solution is titrated by the cerium (IV) sulfate method with an oxidation-reduction electrode used for an electric indication. Preferably, the bath sample is acidified with sulfuric acid and the aluminum ions are added as aluminum sulfate-18-hydrate. The method for determination can be used to advantage for a control of metering means for controlling the supply of nitrite- containing make-up concentrate to phosphating solutions.

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