Letter 31046

Titanium analysis wet-titration method [Scotland] 

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Does anyone know of a procedure for the manual titration of titanium metal dissolved in a solution of hydrofluoric acid / Ferric Sulphate??

Nigel Gill, B.Sc MIMF AIEMA MRSC
Aerospace - Glasgow, South Lanarkshire, Scotland

I don't know of any titration for dissolved titanium. You could do it colorimetrically by taking a small sample of bath, adding some (say 20 ml)1:1 sulfuric acid, and heating strongly, in a fume hood of course, to white fumes. This is to drive off the fluoride as HF. Now, let the mixture cool, add it to about 400 ml water in a 500 ml volumetric flask, let this cool, then make up to the mark with water. Now take out a 10 ml portion, and add 1 ml of 3% hydrogen peroxide. A yellow color will develop, the intensity of which is proportional to the concentration of titanium. By comparing with standards made up in a similar way, you can get to the answer.

This would be a lot of work to set up, but once you do the initial work, routine analyses shouldn't take too long.

Dave Wichern - Bronx, NY, USA

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