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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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How to determine Ca++ from phosphate bath
Sir,
Please let me know how to find out Ca++ in calcium modified zinc phosphate without interfering Zn ++ in the same titration.
pearless fabricators - Mumbai, Maharastra, India
2006
2006
Jim,
Typically, sodium cyanide is added to the titration flask to complex zinc so it doesn't interfere.
If you do a Google or equivalent search, you should find what you're looking for.
Good luck.
- Naperville, Illinois
You could try elevating the pH to 13 with sodium hydroxide, filtering, and running the titration again. Calcium should precipitate, leaving amphoteric zinc in solution. You could them determine calcium by the difference between the titration volumes required both before and after.
Dave Wichern
Consultant - The Bronx, New York
2006
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