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LC1566 1,8-Dihydroxy-2-(4-sulfophenylazo)naphthalene-3,6- disulfonic acid trisodium salt
GR for analysis (reagent for fluoride, zirconium, thorium)


Order number Packaging Quantity Price €
AC28566 Glass bottle 25 g



Product information
Synonyms SPADNS
Hill Formula C16H9N2Na3O11S3
HS Code 2927 00 00
EC number 245-803-9
Molar mass 570.4 g/mol
CAS number 23647-14-5


Chemical and physical data
Solubility 220 g/l (22 °C)
Melting point
Molar mass 570.4 g/mol
Bulk density 810 kg/m3
pH value 6.0 (10 g/l, H2O, 22 °C)


Safety information
Storage class 10 – 13 Other liquids and solids
WGK WGK 3 highly water endangering
Disposal 3
Relatively unreactive organic reagents should be collected in container A. If halogenated, they should be collected in container B. For solid residues use container C.


Identity (UV/VIS-Spectrum) passes test
Color change with zirconium conforms
pink – violet
Absorption maximum λ max (buffer pH 7.0) 505 – 510 nm
Spec. Absorptivity A 1%/1cm (λ7m7ax; 0.02 g/l; buffer pH 7.0; calc. on dried substance) 400 – 560
Loss on drying (105 °C) ≤ 10 %


Hazard Symbol