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EC number: 231-143-9
CAS number: 7440-33-7
Relatively low bioaccumulation of tungsten is observed in sunflower
leaves at soil concentrations of 3900 mg W/kg soil, with calculated
concentration factors plateauing at approximately 0.05 (Johnson et al,
2009). Tungsten concentrations factors calculated for ryegrass were
higher and ranged from 56.1-0.202 (Strigul et al, 2005). However, it
should be noted that background levels of tungsten in the collected
soils used for testing were not determined prior to testing. Tungsten
concentrations measured in earthworm tissue ranged from 1.52-193.2 mg/kg
wet weight in soils with tungsten concentrations of 10-10000 mg/kg soil,
respectively (non-aged soil) (Strigul et al, 2005). Additionally,
tungsten concentrations of 10 and 10000 mg/kg soil yielded earthworm
tissue concentrations of 3.45 and 25.9 mg/kg wet weight, respectively
(Strigul et al, 2005). Using these paired concentration data the BCFs
for earthworms in non-aged soils ranged 0.152-0.019 and BCFs for aged
soils ranged 0.345-0.00259. However, it should be noted that background
levels of tungsten in the collected soils used for testing were not
determined prior to testing. Tungsten is not expected to bioaccumulate
in terrestrial organisms.
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