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Physical & Chemical properties

Water solubility

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Description of key information

The solubility of the pigment is <0.004 wt%.

Key value for chemical safety assessment

Additional information

Transformation/dissolution of silicic acid, zirconium salt, cadmium pigment encapsulated was investigated according to the method OECD test series No. 29

(Guidance document on transformation/dissolution of metals and metal compounds in aqueous media).

Under the described conditions of this test with IPC-2013-001 (Silicic acid, zirconium salt, cadmium pigment-encapsulated),

the following dissolved concentrations were measured at the respective loading, exposure and solution pH:

1 mg/L loading after 28 days:

-      Cadmium: 0.34 ± 0.09 µg/L and 0.86 ± 0.39 µg/L at pH 8 and pH 6, respectively

-      Selenium: <LOD and <LOQ (0.08 µg/L) at pH 8 and pH 6, respectively

-      Zirconium: <LOQ (0.001 µg/L) and <LOD at pH 8 and pH 6, respectively

10 mg/L loading after 7 days at pH 6:

-      Cadmium : 1.97 ± 0.34 µg/L

-      Selenium: 0.16 ± 0.03 µg/L

-      Zirconium: below LOD/LOQ, except vessel/sample 1a with 0.16 µg/L

100 mg/L loading after 7 days at pH 6:

-      Cadmium: 3.13 ± 0.40 µg/L

-      Selenium: 0.44 µg/L ± 0.12

-      Zirconium: <LOD

As dissolved Cd, Se and Zr concentrations were below 3.6 µg/L even at the highest loading of 100 mg/L, referring to a solubility of < 0.004 %,

the pigment can be considered environmentally inert.