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Physical & Chemical properties

Water solubility

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Description of key information

3 tests were conducted with Indium metal powder:

-a classical water solubility test according to OECD 105, giving a water solubility (at 20 °C ± 0.5 °C) of <1mg/l. this general test is considered less relevant for ecotoxicity assessment.

-a 24hrs screening transformation -dissolution test under strong stirring at 200rpm, at pH 6 and pH 8. This test showed that at pH 6, some slightly higher In concentration than the DL could be measured. The average Indium concentration measured at pH 8 was in all replicate vessels <1µg/l. From these results, and combined with the observations on In2S3, showing the same effect, it was concluded that the T/D of Indium substances in general is higher at pH 6; as a consequence, further testing on In metal and all other In-substances was performed at pH 6.

-a Transformation-dissolution test according to OECD 29 over 7days and /or 28 days with 100 mg/l and 1mg/l loading, respectively. This latter test is specially designed for ecotoxicity assessments and therefore considered most relevant for ecotoxicity of Indium substances. After 7 days, In measured at pH 6 was <1.0 µg/l; after 28 days, In measured at pH 6 was <0.01µg/l.

Based on these results, it is concluded that the In3+ ion dissolving from In metal powder readily precipitates out as In(OH)3 at pH 6, and is thus not present in solution anymore after 7 days and 28 days. Referring to the results obtained with InCl3 at pH 8, the same conclusion is drawn for the solubility at pH 8.

Key value for chemical safety assessment

Water solubility:
1 µg/L
at the temperature of:
22 °C

Additional information