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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

There are no indications that boron trichloride is bioaccumulative.

Key value for chemical safety assessment

Additional information

A degradation category approach is applied, based on the very rapid and complete degradation (hydrolysis) of boron trichloride in water to form hydrochloric acid and boric acid. The description and justification of the category is presented in Section 13. The endpoint results of the degradation products are transcribed to boron trichloride.

Relevant information for the 2 degradation products:

Hydrogen chloride:

In the aquatic environment the effects of HCl are clearly related to the pH effect, as HCl will dissociate fully in H3O+ & Cl- ions, of which the latter is not a harmful substance. The substance cannot be measured accurately in the body since chlorine ions are already very abundant, and excretion of chlorine via the urine/faeces is high. Therefore, this study is considered scientifically unjustified for this


Boric acid:

Bioconcentration factors of <0.1 to 10.5 L/kg have been reported from laboratory tests of fish and oysters. Boron levels were measured in aquatic food chains and observed the highest concentrations of boron in detritus and filamentous algae. Invertebrates and fish had lower concentrations, indicating that bioaccumulation was not occurring. Based on these data, boron does not bioaccumulate in the aquatic environment.

Endpoint conclusion:

There are no indications that boron trichloride is bioaccumulative.