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- Title
Spectrophotometric measurement of freshwater pH with purified meta-cresol purple and phenol red.
- Authors
Lai, Chun‐Ze; DeGrandpre, Michael D.; Wasser, Brandon D.; Brandon, Taymee A.; Clucas, Daniel S.; Jaqueth, Emma J.; Benson, Zachary D.; Beatty, Cory M.; Spaulding, Reggie S.
- Abstract
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. These two purified indicators were characterized for the first time under low ionic strength conditions, providing their molar absorption coefficients and dissociation constants along with their temperature dependence from 8 °C to 30 °C. At 25 °C, the infinite dilution constants (
- Subjects
HYDROGEN-ion concentration; FRESHWATER ecology; SULFONIC acids; PHTHALEINS; SPECTROPHOTOMETRY; PHENOL red; CRESOL
- Publication
Limnology & Oceanography, Methods, 2016, Vol 14, Issue 12, p864
- ISSN
1541-5856
- Publication type
Article
- DOI
10.1002/lom3.10137