Registration Dossier

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Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
no hazard identified

Marine water

Hazard assessment conclusion:
no hazard identified

STP

Hazard assessment conclusion:
no hazard identified

Sediment (freshwater)

Hazard assessment conclusion:
no hazard identified

Sediment (marine water)

Hazard assessment conclusion:
no hazard identified

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
no hazard identified

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

Conclusion on classification

Read-across from tungsten trioxide and sodium tungstate was used for the assessment of the toxicity of tungsten hexachloride to aquatic algae. The presented effect values are recalculated for tungsten hexachloride. For details and justification of read-across please refer to the attached report in section 13 of IUCLID.

The effect concentration for fish (D.rerio) was recalculated from sodium tungstate dihydrate, resulting in a 96-h LC50 for soluble tungsten of > 106 mg/L. Analogously, re-calculation for freshwater algae and aquatic invertebrates leads to the following (no observed) effect concentrations of soluble tungsten:

- NOEC (D. magna) = 56.7 mg W/L

- EC50 (D. magna) > 101.9 mg W/L

- 72-h ErC10 (P. subcapitata) = 3.82 mg W/L

- 72-h ErC50 (P. subcapitata) = 33.06 mg W/L

Please note that the concentration of soluble tungsten ions actually released from tungsten hexachloride in water is considerably below the re-calculated effect values reported above.Thus, no adverse effects are identified for the amount of soluble tungsten ions released from tungsten hexachloride in water.

WCl6immediately hydrolyses in contact with water, resulting in a marked pH shift (acidification, pH 2-3). Any (hypothetical) ecotoxicity test with WCl6would require neutralization of the pH by means of addition of NaOH that would result in elevated sodium chloride levels in the test vessels of ca. 88 mg/L at 100 mg WCl6/L. This concentrations is, however, considerably below the known adverse effect values for sodium chloride for freshwater organisms and no adverse effects are expected to occur.

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