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EC number: 231-143-9
CAS number: 7440-33-7
Aquatic toxicity classification of inorganic metals and metal compounds
is conducted by comparing transformation/dissolution (T/D) data for the
substance, generated using the standard protocol (UN GHS, 2007, Annex
10) [see Table 3 in Section 1.3 for results] with toxicity data for the
most soluble metal substance as described in the CLP technical guidance
(section IV. 5 Application of classification criteria to metals and
metal compounds) (EU, 2008). In the case of tungsten metal, T/D data for
tungsten metal is compared to the aquatic toxicity reference values
derived from read-across to sodium tungstate. The T/D data is ideally
tested at the pH at which the highest dissolution is expected, within
the range defined by the test protocol (pH 5.5-8.5). Since inorganic
tungsten substances have been demonstrated to have a higher T/D rate at
pH 8.5 than pH 6, the data used for aquatic toxicity classification of
tungsten metal was derived at pH 8.5 (7- and 28- day T/D testing)
(CANMET-MMSL, 2010). These T/D values were compared to the corresponding
acute (31000 ug W/L, based on the ErC50) and chronic (3380 ug W/L, based
on the ErC10) aquatic toxicity reference values derived from sodium
tungstate testing of algae, as the most sensitive standard aquatic
species. The results of this comparison demonstrate that tungsten metal
does not classify for aquatic toxicity.
Table 7.12. Classification of tungsten metal using T/D data
comparison to toxicity data according to CLP
Test type/ duration
T/D loading amount as W (mg/L)
T/D results (μg W/L)
Toxicity reference value (μg W/L)
Comparison of T/D and toxicity values (μg W/L)
Aquatic toxicity classification result
Acute full test/ 7 days
No Acute 1 classification
No Acute 2 classification
No Acute 3 classification
Chronic full test/ 28 days
No Chronic 4 classification
No aquatic toxicity classification
The dissolution of tungsten of tungsten metal of 2.20% obtained from
transformation/dissolution studies was used to estimate the equivalent
tungsten concentration contributed from tungsten metal and to determine
if a PNEC needs to be estimated. A PNEC was developed when the tungsten
equivalent dose was lower than the recommended limit dose (on a tungsten
basis) of the respective study.
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