Sigma-Aldrich Murexide (Ammonium Purpura

Grade

ACS reagent

Quality Level

200

Form

solid

Loss

≤2.0% loss on drying, 105°C

pH

5 (20 °C, 1 g/L in H₂O)

Solubility

1 g/L

Bulk Density

330 kg/M³

Amax

520-524 nm in water

Storage Temp.

2-30°C

Inchi

1S/C8H4N5O6.H3N/c14-3-1(4(15)11-7(18)10-3)9-2-5(16)12-8(19)13-6(2)17;/H(H2,10,11,14,15,18)(H2,12,13,16,17,19);1H3/q-1;/p+1

Related Categories

Indicators

Linkage

Replaces: MX1665-3; MX1665

Analysis Note

Identity (IR-spectrum): passes test
Identity (UV/VIS-Spectrum): passes test
Absorption maximum (water): 520 - 524 nm
Spec. Absorptivity A 1%/1cm (λ_max; 0.01 g/L; water): ≥ 300
Sulfated ash (800 °C): ≤ 1.0 %
Loss on Drying (105°C): ≤ 2.0 %
Suitability as indicator (for metal titration): passes test

Storage Class

11 - Combustible Solids

Wgk_Germany

WGK 3

Flash_Point_F

Not applicable

Flash_Point_C

Not applicable