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EC number: 247-148-4
CAS number: 25637-99-4
HBCDD is predicted to partition in the environment to soil and sediment
(approximately 98%) where it will bind extensively to organic carbon
(estimated Kocsoil 1.25 x 105)
and to be essentially immobile in soil. Based on a release of 1,000
kg/hr to air, water and soil, the predicted partitioning is: air
0.0007%, water 2.1%, soil 40% and sediment (58%) (Level III Fugacity
Model, EPIWIN v3.04, Syracuse Research Corporation). Aerobic and
anaerobic biodegradation in soil and sediment has been demonstrated in
microcosms. Half-lives of 7 to 63 days (soil) and 1 to 32 days
(sediment) has been demonstrated with the shortest half-lives in
anaerobic systems. HBCDD is expected to partition from water to organic
matter (biomass to water partition coefficient 1 x 107)
(EPIWIN v3.04 Syracuse Research Corporation). Sewage treatment plants
are predicted to remove HBCDD from the influent to a high degree (94%
removal) via partitioning to sludge. Aerobic biodegradation in the
treatment plant is not expected. Degradation in the anaerobic digester
of treatment plants is expected.
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