The concentrations and δ11B of gaseous and particulate B were measured concurrently.
There was a strong temperature dependence on the phase partitioning of B.
A positive correlation was observed between the δ11B of gaseous and particulate B.
Particulate B is enriched in 10B relative to gaseous B due to isotopic fractionation.
Gaseous B may be transformed to particulate B through the precipitation of borates.