Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

The authoritative public forum
for Metal Finishing since 1989
-----

Precipitation of hexavalent chromium

Why hexavalent chromium cannot be precipitated by hydroxide? Any explanation for this.

ABDUL RAHMAN BIN AWANG
- KUCHING, SARAWAK, MALAYSIA
2003

Hexavalent chromium is soluble even at high pH, so hydroxide will not precipitate it. It must first be reduced to the trivalent state by the addition of materials like sodium metabisulphite. I am not suggesting that you attempt it, I am answering a student question about theory.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully 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 might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: