Metal finishing Q&As since 1989
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Hazards of gas evolution from nitric titration?
What exactly is the gas or fumes given off during titration of nitric solutions ? I work in an aluminium anodising plant, in the lab as a lab tech. My interest is one of an health concern. Just how nasty / health affecting is the gas/fumes. There is no ducting taking the fumes away, and I do these checks 6 times a shift. Any one help ?
Steven GLab Tech - England
January 25, 2009
Steven,
You are going to have to give us some more detail:
What strength is the nitric acid? If it is a high strength the fumes that are coming off may be just fumes from the nitric solution itself, not from any reaction in the beaker [beakers on
eBay or
Amazon].
Is it a pure nitric solution or is it mixed with other chemicals?
What are you titrating with? Is it a straight acid-base titration? If it is a straight acid-base then the results will be salt plus water. So if you are titrating nitric with caustic solution your resultant products are simply Sodium nitrate and water. If you are titrating with something other than a base we need to know what it is before anyone can tell you what you are producing.
Aerospace - Yeovil, Somerset, UK
January 29, 2009
The samples are so small that there is very little problem in doing a titration, especially if it has been diluted. Large samples are (or should be) a thing of the past. A proper 1 ml sample is as valid as a 10 ml sample with a smaller burrett.
most of the material that would give a gas is dissolved back into the water or normally is in an ionic and not gas form.
- Navarre, Florida
January 29, 2009
I suspect Stephen is analysing nitric acid in his chemical polishing solution where he adds phosphoric acid, warms and titrates slowly with ferrous sulphate ferrous sulphate
[affil links] to a permanent brown end point.
Considerable nitrous fumes are given off during the titration and it should be done under a fume hood and definitely not breathed in.
Geoffrey Whitelaw
- Port Melbourne, Australia
February 22, 2009
Hello,
If fumes are emanating to the extent of creating discomfort, it is better the titration is carried out inside a fume cupboard.
S.Ramajayam
Subramanian Ramajayam
consultant - Bangalore, India
May 28, 2009
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