Reef Central Online Community - View Single Post - Removing copper from reefs, How about calciumethylenediaminetetraacetate ([CaEDTA])?

Randy Holmes-Farley · 02/07/2008, 06:00 AM

This article suggests that the binding of calcium is significant in the presence of low levels of ions such as copper:

http://findarticles.com/p/articles/m..._7/ai_85523010

from it:

EDTA chelation effects on urinary losses of cadmium, calcium, chromium, cobalt, copper, lead, magnesium, and zinc - ethylenediaminetetraacetic acid

"There were significant increases in lead, zinc, cadmium, and calcium, and these increases roughly corresponded to the expected relative increases predicted by the EDTA-metal-binding constants as measured in vitro. There were no significant increases in urinary cobalt, chromium, or copper as a result of EDTA infusion."

This article gives the constants:

http://jn.nutrition.org/cgi/reprint/112/4/652.pdf

It is pretty specific for copper over some of the other metals mentioned, specifically Ca++ and Mg++.

Overall, however, I'm not sure how you'd know how much to add to not overdose and bind other things, while binding enough to be useful.

02/07/2008, 06:00 AM	#6
Randy Holmes-Farley Reef Chemist Join Date: Apr 2001 Location: Arlington, Massachusetts Posts: 86,233	This article suggests that the binding of calcium is significant in the presence of low levels of ions such as copper: http://findarticles.com/p/articles/m..._7/ai_85523010 from it: EDTA chelation effects on urinary losses of cadmium, calcium, chromium, cobalt, copper, lead, magnesium, and zinc - ethylenediaminetetraacetic acid "There were significant increases in lead, zinc, cadmium, and calcium, and these increases roughly corresponded to the expected relative increases predicted by the EDTA-metal-binding constants as measured in vitro. There were no significant increases in urinary cobalt, chromium, or copper as a result of EDTA infusion." This article gives the constants: http://jn.nutrition.org/cgi/reprint/112/4/652.pdf It is pretty specific for copper over some of the other metals mentioned, specifically Ca++ and Mg++. Overall, however, I'm not sure how you'd know how much to add to not overdose and bind other things, while binding enough to be useful. __________________ Randy Holmes-Farley Current Tank Info: 120 mixed reef Last edited by Randy Holmes-Farley; 02/07/2008 at 06:08 AM.