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Kinetic Mineral Custom Rate Law


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I am testing out a custom rate law script file in an X2t model. The model has 4 injection wells and 100 nodes. However, the model does not acknowledge the conditional statement (pH) in any of the nodes except the injection well nodes. The injection solution has a pH less than 6. The kinetic mineral is present in all the nodes. Am I missing something in the script?

IF pH < 6 THEN 20 ELSE 40
20: rate = 0.00000000052481  * totmoles ("H+") ^ 0.72
40: rate = 0.0
60: RETURN rate



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