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us enjecting chemicals for uor results of tannins!Carbon website
Shakhashiri , professer. "Chemical of the Week." General Chemistry. Revised: 6 Feb 2008. www.scifun.org . 4 Mar 2009 <http://scifun.chem.wisc.edu/chemweek/CO2/CO2.html>.
Tannin website
Purchase, James. "CO2 determination and Tannin/Humic Acid levels." CO2 determination and Tannin/Humic Acid levels. FINS. 4 Mar 2009 <http://fins.actwin.com/aquatic-plants/month.9701/msg00192.html>.
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