Søren Peder Lauritz Sørensen (9 January 1868 – 12 February 1939)
was a Danish chemist, famous for the introduction of the concept of
pH, a scale for measuring acidity and alkalinity. He was born in
From 1901 to 1938 he was head of the prestigious Carlsberg Laboratory,
Copenhagen. While working at the
Carlsberg Laboratory he studied
the effect of ion concentration on proteins, and because the
concentration of hydrogen ions was particularly important, he
introduced the pH-scale as a simple way of expressing it in 1909.
The article in which he introduced the scale (using the notation
pH), described two new methods for measuring acidity. The first
method was based on electrodes, while the second involved comparing
the colors of samples and a preselected set of indicators.
^ "Sørensen, Søren Peter Lauritz (1868-1939)". 100 Distinguished
European Chemists. European Association for Chemical and Molecular
Sciences. Archived from the original on 2012-04-25. Retrieved
^ "Søren Sørenson". Science History Institute. Retrieved 20 March
^ Alberty, Robert; Silbey, Robert (1996). Physical
ed.). John Wiley & Sons, Inc. p. 244.
^ Sørensen, S. P. L. (1909). "Enzymstudien. II: Mitteilung. Über die
Messung und die Bedeutung der Wasserstoffionenkoncentration bei
enzymatischen Prozessen". Biochemische Zeitschrift (in German). 21:
^ Nielsen, Anita Kildebæk (2001). "S.P.L. Sørensen" (in Danish).
Biokemisk forening. Retrieved 2007-01-09.