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Keywords
EXCHANGE_MASTER_SPECIES
This keyword is used to define the correspondence between the name of an exchanger and its master species. Normally, this data block is included in the database file and only additions and modifications are included in the input file.
Example
Line 0: EXCHANGE_MASTER_SPECIES
Line 1a: X X-
Line 1b: Xa Xa-
Explanation
Line 0: EXCHANGE_MASTER_SPECIES
- Keyword for the data block. No other data are input on the keyword line.
Line 1: exchange name, exchange master species
- exchange name--name of an exchanger, X and Xa in this example. It must begin with a capital letter, followed by zero or more lower case letters or underscores ("_").
- exchange master species--formula for the master exchange species, X- and Xa- in this example.
Notes
All half reactions for the exchanger (X and Xa, in this example) must be written in terms of the master exchange species (X- and Xa- in this example). Each exchange master species must be defined by an identity reaction with log K of 0.0 in EXCHANGE_SPECIES input. Any exchange reactions for exchange name must be defined with EXCHANGE_SPECIES input.
Example problems
The keyword EXCHANGE_MASTER_SPECIES is not used in the example problems. See listing of default database file in Attachment B for example.
Related keywords
EXCHANGE, EXCHANGE_SPECIES, SAVE exchange, and USE exchange.
- Example
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- Explanation
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- Notes
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- Example problems
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- Related keywords
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User's Guide to PHREEQC - 07 MAY 96
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