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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
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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.
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Dave Wichern
- Bronx, NY, USA
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