[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: chicken and Egg?-biogenic decalcification

>Larry Frank wrote, Friday, Apr. 24:

>....So this is sort of a chicken and egg question. Does the rise in PH due to
>CO2 being pulled from solution cause biogenic decalsification. Or does
>biogenic decalsification cause a rise in PH?
Plants like Elodea, Najas, Eigeria, Ceratophyllum, and Vallisneria are able
to utilize the bicarbonate ion, HCO3-,   They remove CO2, leaving behind
OH-.  The high pH created causes precipitation of calcium carbonate on the
leaf.  The increased OH- drives the equation, HCO3- -------> H+ + CO3--  to
the right.  The H+ combines with the OH- to form H2O, and the CO3--
combines with Ca++ to precipitate out as CaCO3.

Paul Krombholz, in cool central Mississippi, where it is going to get