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kinetic problem

David,

Long time no talk. Hope everything is going right for you.

My student Hui Tan and I have encountered the problem when using kinetics with phreeqc. After reaching eqbm after about 0.1 year, it oscillates between zero and negative rates --- meaning feldspar is precipitating. I suspect that this is a numerical problem. Do you have any ideas how we can fix or trick it? We have math profs here who are expert. If you describe clear enough what is the problem, they may be able to help devise some numerical solutions.

Best regards,

Chen & Tan Hui

Attachment: Book1.pdf
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Attachment: Blackmesa-04-4.pqi
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