----- Forwarded by Michele Y Crouse/WRD/USGS/DOI on 06/12/01 07:45 a.m. ----- Daniel Emilio Martínez To: h2osoft@xxxxxxxx <demarti@xxxxxxx cc: .ar> Subject: question about PHREEQC 06/11/01 05:50 p.m. Dear Mr.: I'd like to make a question about the User's Guide of PHREEQC2.0, specifically about the Example 11. This example is, acording the User's Guide, derived from a sample calculation of the program PHREEQM (Appelo and Postma, example 10.13, p. 431-434). In page 239, line 9, the user's guide said "the number of exchange sites in each cell is 1.1 mmol", which is according with the keyword data block intructions given at page 82. Nevertheless, the referred PHREEQM example states a CEC of 1.1 meq/L of pore water. My question is: the nunmber of exchange sites must be given in mol or in meq/L as in PHREEQM? and if the first is correct: it is claire how to transform the measured CEC in meq/100 g of soil to meq/L of solution (Appelo and Postma, 1993, Example 5.1. p.149), but, how can I make the recalculation from meq/100 g soil to mol as requested in PHREEQC? Thank you very much for your assistance. Yours sincerely Dr. Daniel Emilio Martínez CONICET - Centro de Geología de Costas y del Cuaternario CC 722 - 7600 Mar del Plata T.E. 0223 475 4060
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