Is there any detailed introductions about different database?

[Penny]

Greetings good people.

I used phreeqc and llnl database to run same codes. as a result, different outputs were obtained, such as  Distribution of species, Distribution of alkalinity, Saturation indices, etc.

so I am confused with the differences between various database.

What is the applicability of every database? is there any instructions or introductions according to every database?

Thanks in advance!

[Leonardo]

Is not detailed, but it's something:
(Source: Phreeqc user guide):

Nine database files are provided with the program: (1) phreeqc.dat, a database file derived from
PHREEQE (Parkhurst and others, 1980), which is consistent with wateq4f.dat, but has a smaller set of
elements and aqueous species (table.3); (2) Amm.dat is the same as phreeqc.dat, except that ammonia redox
state has been decoupled from the rest of the nitrogen system; that is, ammonia has been defined as a separate
28 PHREEQC Version 3
component; (3) wateq4f.dat, a database file derived from WATEQ4F (Ball and Nordstrom, 1991);
(4) llnl.dat, a database file derived from databases for EQ3/6 and Geochemist’s Workbench that uses
thermodynamic data compiled by the Lawrence Livermore National Laboratory; (5) minteq.dat, a database
derived from the databases for the program MINTEQA2 (Allison and others, 1990); (6) minteq.v4.dat, a
database derived from MINTEQA2 version 4 (U.S. Environmental Protection Agency, 1998); (7) pitzer.dat,
a database for the specific-ion-interaction model of Pitzer (Pitzer, 1973) as implemented in PHRQPITZ
(Plummer and others, 1988); (8) sit.dat, a database implementing the Specific ion Interaction Theory (SIT)
as described by Grenthe and others (1997); and (9) iso.dat, a partial implementation of the individual
component approach to isotope calculations as described by Thorstenson and Parkhurst (2002, 2004). The
elements and element valence states, corresponding notation, and default formula used to convert mass
concentration to mole concentration units in the database phreeqc.dat are listed in table.3. Other databases
may use different sets of elements, different notation for the element names, or different default conversion
formulas.

[Penny]

Thank you for your kind and helpful reply. It really make sense.