Purification and Physical-Chemical Characterization of Bromocresol Purple for Carbon System Measurements in Freshwaters, Estuaries, and Oceans.

ABSTRACT: This work provides an algorithm to describe the salinity (S _P) and temperature (T) dependence of the equilibrium and molar absorptivity characteristics of purified bromocresol purple (BCP, a pH indicator) over a river-to-sea range of salinity (0 ≤ S _P ≤ 40). Based on the data obtained in this study, the pH of water samples can be calculated on the seawater pH scale as follows: pH_SW = -log(K ₂ e ₂) + log((R - e ₁)/(1 - Re ₄)) where -log(K ₂ e ₂) = 4.981 - 0.1710S _P ^0.5 + 0.09428S _P + 0.3794S _P ^1.5 + 0.0009129S _P ² + 310.2

SUBMITTER: Hudson-Heck E 

PROVIDER: S-EPMC8296007 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature