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Description of key information

For risk assessment purposes a Henry constant of 4E-4 at 25 °C was used as recommended on the Guidance on information requirements and chemical safety assessment Appendix R.7.13-2: Environmental risk assessment for metals and metal compounds

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
0
at the temperature of:
25 °C

Additional information

No data on volatilisation are available for tungsten. However, most tungsten compounds are expected to exist as ions or insoluble solids in the environment. Therefore, volatilisation from moist soil and water surfaces is not expected to be an important fate process (HSDB, 2008). Tungsten is also not expected to volatilise from dry soil surfaces based upon its ionic character and extremely low vapor pressure at environmentally relevant temperatures (1 x 10-10 Pa at 1700°C (Lassner et al, 2005) and 8.15 x 10-8 Pa at 2000°C (Lassner and Schubert, 1999).