pyCHNOSZ

Author: Dr. Grayson Boyer, GEOPIG Lab, Arizona State University

CHNOSZ is a package written by Dr. Jeff Dick for performing thermodynamic calculations in aqueous geochemistry and biogeochemistry. pyCHNOSZ is a Python conversion of CHNOSZ that allows these calculations to be carried out in Python 3 Jupyter notebooks.

Features

The following CHNOSZ functions are supported in pyCHNOSZ:

info - Search for chemical species by name or formula and retrieve their thermodynamic parameters.
add_OBIGT - Add or overwrite species in the OBIGT thermodynamic database by supplying a comma separated value (csv) file with custom data.
mod_OBIGT - Modify species in the OBIGT thermodynamic database. Optionally, supply a Pandas dataframe containing custom data.
reset - reset data to default values.
subcrt - Calculate standard state partial molal thermodynamic properties of reactions at elevated temperatures and pressures.
basis - Define basis species of a chemical system.
species - Define the species of interest in a system.
equilibrate - Calculate equilibrium chemical activities of species from the affinities of formation of the species at unit activity.
affinity - Calculate the chemical affinities of formation reactions of species.
diagram - Plot equilibrium chemical activity (1-D speciation) or equal-activity (2-D predominance) diagrams as a function of chemical activities of basis species, temperature and/or pressure.
And more. See the documentation for pyCHNOSZ

Requirements

This package must be installed into an environment with an R installation. See these instructions for installing R with Anaconda. Additionally, the CHNOSZ package for R must be installed (see instructions below).

Installation

Installing pyCHNOSZ

Install pyCHNOSZ using pip:

$ pip install pychnosz

Usage

Import pyCHNOSZ in your python code with:

import pychnosz

In the following examples, pyCHNOSZ functions are imported with:

from pychnosz import info, add_OBIGT, mod_OBIGT, reset, subcrt

Search for chemical species

The info() function can be used to look up chemical species by name or formula. If names or formulas are provided, database index integers are returned. A list of integers will look up chemical species by index and return a table of thermodynamic properties. See the info() function's original documentation to learn more about what this function can do. A few examples are shown below.

Look up the database index value of Fe+2:

info("Fe+2")

Look up multiple chemical species:

info(["HCO3-", "CH4"])

Define chemical states:

info(["HCO3-", "CH4"], state=["aq", "gas"])

Search species by index values to look up their thermodynamic parameters.

info([13, 872])

Nest info functions to look up thermodynamic properties directly from names or formulas:

info(info("Fe+2"))

Add or replace thermodynamic data in the database

See the original R documentation for add_OBIGT() and reset() for basic useage. A few examples are given below.

Load the SUPCRT92 database.

a = add_OBIGT("SUPCRT92")

The variable a is assigned a list of integers corresponding to the indices of chemical species that are added or replaced in the OBIGT thermodynamic database used by pyCHNOSZ.

It is possible to add a custom table of thermodynamic parameters.

a = add_OBIGT("my_custom_entries.csv")
info(a) # confirm new entries have been added

The entries of my_custom_entries.csv would then be available for thermodynamic calculations with subcrt(), for example.

Reset thermodynamic database to its original configuration.

reset()

Modify values in the thermodynamic database with mod_OBIGT():

mod_OBIGT("HCO3-", G = -140283.7, Cp = -9)
info(info("HCO3-"))

Calculate thermodynamic properties of reactions

See the original documentation for subcrt(). Useage in pyCHNOSZ is the same, except python lists are used in place of R's vectors. The function produces a dictionary of results stored in pandas dataframes. An example is shown below for the reaction H_{2 (aq)} + 0.5 O_{2 (gas)} = H₂O_(liq) at 30 and 50 degrees C and 100 bars pressure:

subcrt(species=["H2", "O2", "H2O"], coeff=[-1.0, -0.5, 1.0],
       state=["aq", "gas", "liq"], T=[30, 50], P=100)

Output is a python dictionary of dataframes:

subcrt: 3 species at 2 values of T (ºC) and P (bar) (wet) [energy units: cal]

{'reaction':       coeff    name formula state  ispecies
 62     -1.0      H2      H2    aq      62.0
 2612   -0.5  oxygen      O2   gas    2612.0
 1       1.0   water     H2O   liq       1.0,
 'out':       T    P       rho       logK             G             H         S  \
 1  30.0  100  1.000017  43.855086 -60832.380282 -67420.887872 -21.89070   
 2  50.0  100  0.992305  40.834419 -60379.262657 -67882.530994 -23.36663   
 
           V         Cp  
 1 -7.494052 -24.126268  
 2 -8.259704 -20.941879  }

More examples:

For more examples, check out the pyCHNOSZ tutorial notebooks available from the WORM Library.

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Release history Release notifications | RSS feed

1.4.2

Aug 5, 2026

This release

1.4.1

Aug 4, 2026

1.3.0

Apr 15, 2026

1.2.1

Feb 10, 2026

1.2.0

Jan 21, 2026

1.1.15

Jan 21, 2026

1.1.14

Jan 8, 2026

1.1.13

Jan 5, 2026

1.1.12

Jan 5, 2026

1.1.11

Dec 29, 2025

1.1.10

Dec 29, 2025

1.1.9

Dec 29, 2025

1.1.8

Dec 29, 2025

1.1.7

Dec 29, 2025

1.1.5

Dec 27, 2025

1.1.4

Dec 18, 2025

1.1.1

Dec 18, 2025

1.1.0

Dec 17, 2025

1.0.0

Dec 17, 2025

0.9.1

Jun 19, 2025

0.9.0

Jun 18, 2025

0.8.16

Jan 27, 2025

0.8.15

May 31, 2024

0.8.13

May 28, 2024

0.8.12

Mar 21, 2023

0.8.11

Feb 16, 2023

0.8.10

Nov 4, 2022

0.8.9

Aug 17, 2022

0.8.8

Aug 9, 2022

0.8.7

Mar 7, 2022

0.8.6

Feb 13, 2022

0.8.5

Jan 14, 2022

0.8.4

Jan 6, 2022

0.8.3

Dec 22, 2021

0.8.2

Oct 15, 2021

0.8.1

Oct 15, 2021

0.8.0

Oct 11, 2021

0.7.2

Oct 3, 2021

0.7.1

Oct 2, 2021

0.7.0

Sep 28, 2021

0.6.5

Sep 25, 2021

0.6.4

Sep 25, 2021

0.6.3

Sep 25, 2021

0.6.2

Sep 25, 2021

0.6.1

Sep 25, 2021

0.6.0

Sep 25, 2021

0.5.2

Sep 21, 2021

0.5.1

Sep 20, 2021

0.5.0

Sep 20, 2021

0.4.1

Sep 14, 2021

0.4.0

Sep 5, 2021

0.3.1

Aug 27, 2021

0.3.0

Aug 27, 2021

0.2.7

Aug 26, 2021

0.2.6

Aug 4, 2021

0.2.5

Jul 23, 2021

0.1.5

Mar 4, 2021

0.1.4

Mar 4, 2021

0.1.3

Feb 9, 2021

0.1.2

Feb 7, 2021

0.1.1

Feb 7, 2021

0.1.0

Feb 5, 2021

0.0.9

Feb 5, 2021

0.0.8

Feb 5, 2021

0.0.7

Jan 26, 2021

0.0.6

Jan 26, 2021

0.0.5

Jan 22, 2021

0.0.4

Jan 22, 2021

0.0.3

Jan 22, 2021

0.0.2

Jan 22, 2021

0.0.1

Jan 22, 2021

pychnosz 1.4.1

pyCHNOSZ

Features

Requirements

Installation

Installing pyCHNOSZ

Usage

Search for chemical species

Add or replace thermodynamic data in the database

Calculate thermodynamic properties of reactions

More examples:

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1 maintainer

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