MERCK – 101340 Congo Red (C.I. 22120)

Specifications :

  • Identity (UV/VIS-Spectrum) : passes test
  • Appearance of solution (1 g/l; water) : passes test
  • Transition range : pH 3.0 – pH 5.2 violet – orange-red
  • Absorption maximum λ 1 max. (buffer pH 3.0) : 563 – 568 nm
  • Absorption maximum λ 2 max. (buffer pH 5.2) : 484 – 489 nm
  • Spec. Absorptivity A 1%/1cm (λ 1 max.; 0.01 g/l; buffer pH 3.0; calc. on dried substances) : ≥ 150
  • Spec. Absorptivity A 1%/1cm (λ 2 max.; 0.01 g/l; buffer pH 5.2; calc. on dried substances) : ≥ 200
  • Loss on drying (110 °C) : ≤ 5 %
  • Sensitivity test : passes test
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MERCK – 101340 Congo Red (C.I. 22120) Indicator

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