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-ve vs. +ve mole transfers & Closed vs. Open system


	On your phreeqc model, could you clarify the following:

	1). For -ve CO2 mole transfers, should I interpret this
	as CO2 release/respiration ? And, +ve CO2 mole transfers
	as CO2 uptake/dissolution ?  

	2). In several of the inverse models, I noticed consistent negative mole
	 transfers for gypsum, but I believe gypsum doesn't precipitate

	3). Is an open system assumed for inverse modeling ?  i.e.,
	the partial pressure of CO2 is not fixed ?



* Ranjan S. Muttiah                     * 
* Associate Professor                   *
* Texas Agricultural Experiment Station *
* 808 East Blackland Road               *
* Temple, Texas 76502                   *
* Tel: 254-774-6103                     *
* Fax: 254-770-6561                     *
* email: muttiah@xxxxxxxxxxxxx          *

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