Registration Dossier
Registration Dossier
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EC number: 269-075-7 | CAS number: 68187-15-5 An inorganic pigment that is the reaction product of high temperature calcination in which praseodymium (III) oxide, praseodymium (IV) oxide, silicon oxide, and zirconium (IV) oxide in varying amounts are homogeneously and ionically interdiffused to form a crystalline matrix of zircon. Its composition may include any one or a combination of the modifiers alkali or alkaline earth halides.
Endpoint summary
Administrative data
Description of key information
The test substance (Zirconium praseodymium yellow zircon, CAS 68187-15-5, EC 269-075-7) is an inorganic, yellow, odourless, powder.
- Melting point > 1000 °C.
- relative density 4.47.
- Particle size distribution: D50 = 9.6 µm, D90 = 21.8 µm, D10 = 3.3 µm
- Dustiness:
total: 44.61 mg/g
MMAD= 22.79 µm, GSD= 3.83
Fractional deposition in human respiratory tract: Head (ET): 48.1 %, Tracheobronchial (TB): 0.8 %, Pulmonary (PU): 0.9 %
- The transformation/dissolution
The dissolved concentrations of Si at a 1 mg/l loading after 7 and 28 days and at a 100mg/L loading after 7 days were below the LOD (0.07 µg/L) and therefore not determinable.
The dissolved concentrations of zirconium and praseodymium at a 100 mg/l loading after 7 days were 0.16 µg/L and 86.25µg/L, respectively.
The dissolved concentrations of zirconium and praseodymium at a 1 mg/l loading after 7 days were 0.17 µg/L and 2.1 µg/L, respectively.
The dissolved concentrations of zirconium and praseodymium at a 1 mg/l loading after 28 days were < LOD (0.08 µg/L) and 0.79 µg/L, respectively.
Additional information
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