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The isotopic fractionation factors used by IsoFind are published in an open format, one file per isotopic system, under the CC BY 4.0 licence. Every numeric value carries its citation, without exception.
The databases at a glance
A factor whose origin cannot be named is a factor nobody can check, and a database of those costs more than it saves.
The citation is a property of the entry, not a footnote. The format refuses it absent, so an incomplete database does not build.
The database says where a value is found, the publication says what justifies it. It is the latter that belongs in your references.
Of the 180 rows in IsoFind's internal database, five had no identifiable citation. They are not published, and they are named in the reference paper rather than quietly patched.
The table below lists what each database covers. The files can be downloaded from igl-lang.org, with their digests.
| Element | Ratio | Entries | Sources |
|---|---|---|---|
| Cd | 114Cd/110Cd | 16 | 15 |
| Cr | 53Cr/52Cr | 26 | 24 |
| Cu | 65Cu/63Cu | 19 | 18 |
| Fe | 56Fe/54Fe | 28 | 28 |
| Li | 7Li/6Li | 5 | 5 |
| Ni | 60Ni/58Ni | 6 | 5 |
| Pb | 206Pb/204Pb | 1 | 1 |
| Pb | 207Pb/206Pb | 2 | 1 |
| Pb | 208Pb/206Pb | 3 | 1 |
| Sb | 123Sb/121Sb | 38 | 23 |
| Se | 82Se/76Se | 9 | 8 |
| Sr | 88Sr/86Sr | 7 | 7 |
| W | 186W/184W | 2 | 1 |
| Zn | 66Zn/64Zn | 18 | 18 |
The same vocabulary describes a process in the database, in the language and in the identification engine. A lookup table between the three would have had no future but to diverge.
adsorption, biological, dissolution, evaporation, precipitation, redox, uptake
pyrometallurgy, hydrometallurgy, natural, biotic
equilibrium or kinetic
One finding made while normalising the database is worth knowing for its users: the delta convention of published sources is not constant, sometimes product minus reactant and sometimes the reverse. Thirty-four rows out of a hundred and eighty came out with the roles inverted. Initial and final oxidation states are now what settles the roles.
The fourteen files are published on igl-lang.org with their SHA-256 digests. They read in a text editor and work with any conforming engine.
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