heterogeneity

in analytical chemistry
https://doi.org/10.1351/goldbook.H02803
See: homogeneity (in analytical chemistry)
Source:
PAC, 1990, 62, 1193. 'Nomenclature for sampling in analytical chemistry (Recommendations 1990)' on page 1201 (https://doi.org/10.1351/pac199062061193)