-- The Home Page of the Finishing Industry

on this site
current topics
Live! From Pine Beach NJ: The world's most popular metal finishing website, and the internet's friendliest corner

topic 17815

Analyzing Ni and Au of electroless Ni, immersion Au bath


Hello, friends,

I'm going to handle the electroless nickel & immersion gold process in my company. But, I'm still facing some problem to analyze the Ni content & gold content in the plating bath. Could somebody suggest me some methods to analyze the Ni & Au content of this plating bath?

Thank you very much in advance for your helpfulness!


Wymen Lee
- Penang, Malaysia


The chemical analysis of nickel in EN is similar to that in electroplating. You will have to change the volume of sample and the strength of titrant. The following procedures are for nickel in EN that contains no other metals.

1. Pipet 10 ml of sample into a flask (I like Erlenmyer).
2. Add 100 ml of deionized water.
3. Add 10 ml of concentrate NH4OH (pH should be at least 10).
4. Add 2 g of 0.2% murexide indicator. Swirl gently.
5. Titrate immediately with 0.2 N (0.1 M) EDTA.

Ni (g/l) = 0.587*ml of EDTA

There are slight variations of this method. Some uses more NH4OH. Some uses pH 10 buffer. Some adds triethanolamine. You might want to make up a solution of known nickel content and then try it.

Good luck.

Kai Lorcharoensery
Lehigh University - Bethlehem, Pennsylvania, USA


Dear Mr. Lorcharoensery,

Thank you very much for the info. Unfortunately, murexide is banned chemical(Poison) in Malaysia here. I've discussed with our chemical suppliers and they said it's impossible to have this chemical in Malaysia. It's against our law here. Anyway, thanks for your help. Is there any others method beside this titration?

Best Regards,

Wymen Lee
- Penang, Malaysia

If you have a question in mind which seems off topic, please Search the Site

ADD a Q, A, or Comment on THIS topic START an UNRELATED topicView CURRENT 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

©1995-2019, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.