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Bromocresol Purple CAS:115-40-2 Product Introduction
Product name:Bromocresol Purple
CAS:115-40-2
MF: C21H16Br2O5S
MW: 540.22
Appearance:Light yellow rose crystalline powder.
Bromocresol Purple Characteristic:
Insoluble in water, soluble in ethanol, it turns yellow, soluble in dilute sodium hydroxide and dilute sodium carbonate solution, it turns purple, melting point 241-242℃.
Bromocresol Purple Indicator:
| Items | Standard | Results |
| Maximum absorption wavelength；λ1（PH 35.2） nm | 427—431 | 429 |
| Maximum absorption wavelengthλ2 (PH 56.8) nm | 588—590 | 588 |
| Mass absorption coefficient （L/cm。g） α1(λ1PH 5.2, Dry sample) |
40.5—45.0 | 41.0 |
| Mass absorption coefficient （L/ cm。g） α2（λ2PH 56.8, Dry sample） |
100.0—110.0 | 101.0 |
| PH change color gamut | 5.2（yellow）—6.8 （purple） |
5.2（yellow）—6.8 （purple） |
| Dilute alkali dissolution test | Pass | pass |
| Burning residue（As sulfate） | ≤0.1 | 0.1 |
| Loss on drying | ≤0.5 | 0.5 |
Bromocresol Purple Application:
1.The main use of bromocresol purple is acid-base indicator, the color changes from light yellow to purple, and the pH value of the discoloration range is
5.2-6.8.
2.Non-aqueous titration indicator. pH color change range: 5.2 (yellow)-6.8 (purple)
3.A dsorption indicator. Internal standard for amino acid chromatography.
4.Titration of thiocyanate by silver salt method.
5.Spectrophotometrically precipitate serum proteins.
Package:
– 25kg/drum, 100kg/drum
Storage and transportation
To be protected from water.To be protected from torrid sunlight.To be protected from fire
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