For two decades, knowledge about cadmium isotope geochemistry has drawn much interest and understanding of its geochemical cycling is crucial for many environmental studies. Cadmium isotopes can be used in marine biogeochemistry and oceanography, given its behavior and close correlation with algal nutrients, and as a tracer of pollution sources. “Despite these numerous environmental studies, there is a surprising lack of a fundamental understanding of cadmium isotope fractionation at specific conditions. The bioavailability, mobility, and toxicity of cadmium depend on its speciation in the natural system and these processes can be somehow identified using cadmium isotope systematics,” says Professor Michael Komárek…