🔴 ⚗ **S.P.L. Sørensen, the pH concept and its early history**

_“Introduced as a convenient symbol for ‘hydrogen ion exponent’ by the Danish biochemist S.P.L. Sørensen in 1909, after a decade or two pH won broad acceptance in the fields of physiology, biochemistry, medical research, and industrial chemistry in particular. Apart from detailing how pH and related concepts were initially received, this paper examines the language and nomenclature associated with the pH scale until about 1930.”_

Kragh, H. S.P.L. Sørensen, the pH concept and its early history. Found Chem (2025). https://doi.org/10.1007/s10698-025-09532-6

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