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How to test for Anticaking Agent in Salt (ASTM B117)

Q. I work at a surface treatment laboratory in an Aircraft industry. We've been using Broxetten salt for Salt Spray Test per ASTM B117. The problem is we can't get Certificate of Analysis from our salt supplier as a proof that their salt is free from Anticaking agent. So, I would be very grateful if anyone can give a clue on how to test for the presence and percentage of anticaking agent in Sodium Chloride (NaCl)?

Endang Sari
Laboratory Engineer - Bandung, West Java, Indonesia
May 10, 2011

A. The anticake agent is potassium ferricyanide ⇦ on eBay orsit Amazon [affil link] and soluble ferrous iron salts form Prussian Blue with potassium ferricyanide. There are a number of test kits for ferricyanide on the web.

Leo Herrington
- Fort Walton Beach, Florida

A. I believe that sodium silicoaluminate is also used.

Dave Wichern
Consultant - The Bronx, New York

A. If it is free flowing, it has anti-caking agent

Sara Michaeli
Tel-Aviv-Yafo, Israel

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