Bromothymol blue sodium salt in ACS Reagent grade water, Sigma-Aldrich®

Supplier: SIGMA-ALDRICH MICROSCOPY


M-Clarity™ quality level = MQ200

114421-25GEA 122 EUR
114421-25G 114421-5G
Bromothymol blue sodium salt in ACS Reagent grade water, Sigma-Aldrich®
Bromothymol blue sodium salt

Bromothymol blue has been used for freshwater pH measurements over a broad range of buffer intensities.


  • pH-indicator
  • Used for carbonic anhydrase assay due to the conversion of carbon dioxide to bicarbonate
  • Used as a diagnostic assay manufacturing, hematology, histology

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Specification Test Results

Appearance (Form) Powder or Crystals
Infrared spectrum Conforms to Structure
Wavelength c = 0.005 g/L; 0.1 N NaOH 614 - 618 nm
Extinction Coefficient ≥35000
Wavelength 392 - 396 nm
Extinction Coefficient ≥8000
Wavelength 305 - 309 nm
Extinction Coefficient ≥13000
Visual Transition Interval Yellow to Yellow-Green (pH 6.0) Pass
Visual Transition Interval Green (pH 6.7) Pass
Visual Transition Interval Blue (pH 7.6) Pass
Clarity of Solution, c = 0.1%; Water, Clear with only a faint trace of turbidity or insoluble matter Clear to Very Slightly Hazy

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