What is the titration invented by the Danish chemist famous for the concept of pH used for?
Sørensen formol titration: The Sørensen formol titration(SFT) invented by S. P. L. Sørensen in 1907 is a titration of an amino acid with potassium hydroxide in the presence of formaldehyde. Sørensen formol titration:  It is used in the determination of protein content in samples. S. P. L. Sørensen: 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.
the determination of protein content