-- The Home Page of the Finishing Industry
23+ years of serious education, promoting Aloha,
& the most fun you can have in metal finishing smiley
    no popups, no spam
on this site
current topics
topic 12237

Sodium cyanide



I want to know how we can determine there is deficiency of sodium cyanide in rochelle copper bath. And method of calculating it to add.

Ajay Aggarwal
steel - Panchkula, Haryana, India


Dilute 10 ml of bath to 100ml with DI water. Add 5 ml of 10% potassium iodide. Titrate to a permanent yellow/white turbidity (the endpoint). Record volume of titrant as T. T x 0.98 = g/l sodium cyanide T x 1.3 = g/l potassium cyanide You probably want to keep the free cyanide concentration in the range of 4-9 g/l.

James Totter
James Totter, CEF
- Tallahassee, Florida


Wet Analysis to determine sodium cyanide(free cyanide in this case)
Pipette 10 ml sample into a 150 ml flask.
Add 50 mls D.I. water.
Add 2 mls of Potassium Iodide Solution.
Titrate with 0.153 N Silver Nitrate Solution to a permanent opalescence end point.
Mls titrated X 0.2 = oz/gal Sodium Cyanide

oz/gal Sodium Cyanide required minus oz/gal figured from titration = oz/gal Sodium Cyanide to be added.

oz/gal needed to be added X tank volume = ounces to add.
ounces to add divided by 16 = pounds to be added.

Terry L Miller
- Wrightsville, 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 Comment to THIS thread START a NEW threadView CURRENT 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

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.