S. P. L. Sørensen

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Søren Peder Lauritz Sørensen (January 9, 1868 - February 12, 1939). Born in Havrebjerg, Denmark, Sørensen was a Danish chemist, famous for the introduction of the concept of pH, a scale for measuring acidity.

From 1901 to 1938 he was head of the prestigious Carlsberg Laboratory, Copenhagen.[1] While working at the Carlsberg Laboratory he studied the effect of ion concentration on proteins,[2] and because the concentration of hydrogen ions was particularly important, he introduced the pH-scale as a simple way of expressing it in 1909.[3] The article in which he introduced the scale (using the notation pH[4]), described two new methods for measuring acidity.[5] The first method was based on electrodes, while the second involved comparing the colors of samples and a preselected set of indicators.

He is also known for the Sørensen formol titration.

[edit] References

  1. ^ Sørensen, Søren Peter Lauritz (1868-1939). 100 Distinguished European Chemists. European Association for Chemical and Molecular Sciences. Retrieved on 2007-01-09.
  2. ^ Søren Sørenson. Chemical Achievers - The Human Face of the Chemical Science. Chemical Heritage Foundation. Retrieved on 2007-01-09.
  3. ^ Alberty, Robert; Silbey, Robert (1996). Physical Chemistry, second edition, John Wiley & Sons, Inc., p. 244. ISBN 0-471-10428-0. 
  4. ^ Sørensen, S. P. L. (1909). "Enzymstudien. II: Mitteilung. Über die Messung und die Bedeutung der Wasserstoffionenkoncentration bei enzymatischen Prozessen" (in German). Biochemische Zeitschrift 21: 131-304. 
  5. ^ Nielsen, Anita Kildebæk (2001). S.P.L. Sørensen (Danish). Biokemisk forening. Retrieved on 2007-01-09.
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