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EC number: 235-243-3
CAS number: 12138-09-9
No data on the behavior of tungsten disulphide in the environment are
available. However, data for sodium tungstate and tungsten metal are
expected to adequately capture the range of mobility of tungsten
disulphide in the environment.
The adsorption/desorption is highly dependent on the characteristics of
the soil system in question. For example, soil sorption coefficients of
tungsten metal and sodium tungstate are found to increase with
decreasing pH (Bednar et al., 2008). Additionally, soil-tungsten systems
may take up to approximately 3-4 months to reach equilibrium (Griggs et
al., 2009 and Bednar et al., 2008).
Soil sorption coefficients measured for sodium tungstate ranged from
16.6 to 863 (Bednar et al., 2008 and Griggs et al., 2009).
Other partitioning coefficients for tungsten in the environment were
estimated using paired sampling data. Tungsten partition coefficients
for water-sediment were derived using paired environmental monitoring
samples of tungsten in water and sediment collected in various parts of
the EU, resulting in a median calculated Kd of 140000 (Salminen R (Ed.)
et al., 2005).
The following partitioning coefficients were statistically derived based
on studies using appropriate methodology:
Kd soils (Griggs et al., 2009 and Bednar et al., 2008):
10thpercentile: 44 L/kg
Median: 174 L/kg
90thpercentile: 692 L/kg
Kd sediment (Salminen R (Ed.) et al., 2005):
10thpercentile: 28395 L/kg
Median: 140000 L/kg
90thpercentile: 700000 L/kg
Volatilization is not expected to be a significant pathway for tungsten
disulphide, based on the low vapor pressure and ionic or insoluble state
of most tungsten compounds in the environment.
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