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Physical & Chemical properties

Water solubility

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Description of key information

Gold powder showed no dissolution above the Limit of Detection in either the 24 hour screening transformation dissolution study (LOD: 0.1 µg/L)  or in the full 28 day test (LOD: 0.3 µg/L).    

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Additional information

GLP-compliant transformation dissolution tests were conducted according to OECD guideline 29 (ECTX 2012a, ECTX 2012b). In the 24 hour screening test a loading rate of 100 mg/L was used and the test was conducted at pH 6 and pH 8. In the full study loading rates of 10 and 100 mg/L (7 days duration) and 1 mg/L (28 days duration) were used. The test was conducted at pH 6, which is taken to represent the worst case as more acidic conditions generally tend to favour metal solubility. Gold powder showed no dissolution above the limit of detection in either test.