chemical species
Technical term in chemistry referring to a specific chemical entity such as an atom, molecule, ion, or radical.
We performed an analysis to identify the chemical species in the solution.
chemical speciation
metal speciation
Compound of 化学 (かがく, 'chemistry') and 種 (しゅ, 'species'). The exact historical derivation is uncertain, but the term is a direct translation of the English 'chemical species'.