Impurities in indicator salts can significantly bias spectrophotometric pH determinations. In this work, two purified sulfonephthalein indicators, meta-cresol purple (mCP) and phenol red (PR), were tested for analysis of freshwater pH on the free hydrogen ion concentration scale. The work presented here is the first parallel comparison with two purified indicators used to determine pH of the same freshwater samples.
Author(s): Lai, C.Z., M.D. DeGrandpre, B.D. Wasser, T.A. Brandon, D.S. Clucas, E.J. Jaqueth, Z.D. Benson, C.M. Beatty, and R.S. Spaulding
Date: 2016
Link: https://necan.org/wp-content/uploads/2025/09/Lai-et-al.-2016.pdf
Overview:
Educational Materials
Scientific Literature
Parameters:
pH