netneut
finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing


Finishing.com has been free for 22 years,
but without net neutrality we could soon
cease to exist. Do us a solid, click on
the banner, and contact congress today!
HomeFAQsBooksHelpWantedAdvertiseForum
topic 5458

Testing Carbonate Levels


(2000)

Does anyone know of a quick way of quantitively measuring carbonate levels in a potassium cyanide plating bath? The only technique I know of takes 1/2 day to a full day and I'm trying to find a quicker technique.

Mark Roberts
- England


(2000)

This should be faster: Add a 10 ml sample of the bath to an erlenmeyer flask containing 100 ml hot DI H2O and 35 ml 10% Ba(NO3)2. Allow to settle, filter, wash filter 2X with hot DI H2O. Transfer precipitate and filter paper to a beaker, add 100 ml DI H2O, 5 drops methyl orange indicator. Titrate with a standard HCl solution to a pink endpoint. oz/gal K2CO3 = (ml HCl) x (N HCl) x 0.921

James Totter
James Totter, CEF
- Tallahassee, Florida


(2000)

There is a similar procedure using BaCl2 in the Metal Finishing Guide Book. Instead of titrating with HCl I prefer the back titration procedure where you add a known amount of HCl and back titrate the unused HCl with NaOH. It is more accurate. Anyhow analysis with Barium should not take more then 30 minutes. (most of the 30 minutes is just to let the BaCO3 to settle).

sara michaeli
sara michaeli signature 
Sara Michaeli
chemical process supplier
Tel-Aviv, Israel



(2000)

The method that Sara lists is the one I prefer and that my laboratory has been using for over 30 years. It is quite accurate. I do however wish to make you aware that you should be performing the procedure under a hood (exhaust)

Gene Packman
process supplier - Great Neck, New York


(2000)

Fastest and easiest = spectrophotometry. A really easy to use and very accurate system can be obtained from the Hach Water Testing Company of Loveland Colorado. The actual test may take a minute or so, is extremely reproducible and can be accurate to less than a part per ten million. Pennies per test.

Dale Woika
- Bellefonte, Pennsylvania



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.