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Environmental fate & pathways

Biodegradation in soil

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Description of key information

According to column 2 of Annex IX of REACH "Further biotic degradation testing shall be proposed by the registrant if the chemical safety assessment according to Annex I indicates the need to investigate further the degradation of the substance and its degradation products. The choice of the appropriate test(s) depends on the results of the chemical safety assessment and may include simulation testing in appropriate media (e.g. water, sediment or soil)."

The degradation of the inorganic compound boron trichloride is well understood. It degrades rapidly within 1 minute in water to hydrogen chloride and boric acid. Soil contains water which will react with boron trichloride at the point of contact.

Both inorganic degradation products can dissociate but are not  further degradable.  Biodegradation is not a relevant concept for inorganic substances.

Therefore there is no "need to investigate further the degradation of the substance and its degradation products".

Key value for chemical safety assessment

Half-life in soil:
1 min
at the temperature of:
25 °C

Additional information

The half-life of boron trichloride in water is <1 min, see under Section 5.1.2 Hydrolysis. Boron trichloride at the point of contact with soil will react with the humidity of the soil.