Abstract

The concept of a chemical speciation, as defined by in the year 2000, is grounded in an empiricist semantics. It is a static concept, as it is associated with the ontological category of the chemical state of the distribution of chemical species in a system and is further restricted to chemical species of a single element as it excludes chemical species with more complex chemical systemic subunits, such as molecular species, crystals, or nanoparticles. In this work, we propose a new definition of chemical speciation based on a semantics of meaning, applying Mario Bunge's philosophical system. Chemical speciation is the distribution of chemical systemic subunits amongst defined chemical species in a system. Additionally, we propose two dynamic concepts associated with chemical speciation: chemical species transformation and chemical species evolution. These concepts aim to account for the chemical changes that explain both the diversity of chemical species sharing common systemic subunits and the historical emergence of new modes of chemical speciation. These modes, in turn, explain the appearance of new systemic chemical subunits and novel substantial properties. Our definitions have the advantage of being consistent with general theories of the evolution of matter, such Assembly Theory. Additionally, at the chemical level, this approach encompasses broader systemic chemical subunits beyond elemental particles, allowing for the chemical speciation of families of molecules, crystals, nanoparticles, etc. Finally, our proposal offers the advantage of overcoming the issue of arbitrariness in choosing the reference systemic chemical subunit by linking this choice to the concepts of substantial property, and function.