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Physical & Chemical properties

Water solubility

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Description of key information

The dissolved concentration of lead in a 1 mg/l mixture of C.I. Pigment Yellow 34 after 28 days at pH 6 according to OECD test guideline 29 (Transformation/dissolution protocol) was 36.8 ug lead/l. After 28 days a plateau was reached. 

Key value for chemical safety assessment

Water solubility:
36.8 µg/L
at the temperature of:
20 °C

Additional information

The transformation/dissolution of chromium and lead from representative samples of C.I. Pigment Yellow 34 and C.I.Pigment Red 104 and from C.I. Pigment Yellow 34 used in paint and plastic matrix) was determined according to OECD guideline 29 under GLP using ICP-MS. The tests were performed at pH 6 and 8 in a screening test (24h) at 100 mg test item per liter and both Chromium and Lead were analysed.

Chromium dissolution was higher at pH 8 and lead dissolution was higher at pH 6. Overall the dissolution of lead was considerably higher than that of chromium. As the toxicity of lead also seems to be higher than that of chromium, it was decided that the full test should be carried out with lead at pH 6.

The full test was performed with the pigments (1, 10 and 100 mg/l) and the paint and plastic matrix (100 mg/l). Th

e dissolution of samples at 10 and 100 mg/l were followed for 1 week. For the pigment sample of 1 mg/l and the paint and plastic matrix the duration was 28 days.

The curve of the dissolution over time shows that a plateau level was reached after 28 days. For C.I. Pigment Yellow 34 and C.I. Pigment Red 104 dissolved lead concentrations were found to be 36.8 and 69.3 ug/L after 28 days at a loading rate of 1 mg/L respectively.

For the paint and plastic matrices, this was 28.9 and 1.1 ug/L. This represents circa 0.2% of the lead contents in all cases. When related to the surface area of the pigments, the dissolution was 5.1 and 7.2 mg lead/m2 after 28 days.