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EC number: 234-522-7
CAS number: 12007-92-0
Mallard ducks have been studied as representative of terrestrial
non-predatory organisms that consume plant food. Pendleton et al. (1995)
monitored body tissue levels on diets with 1600 mg-B/kg for up to 48
days. Boron levels were higher on day 32 than on day 4 and differed
among all tissues, with the highest levels in blood (average 50.2
mg/kg), followed by brain (31.4 mg/kg) and liver (24.9 mg/kg). Pendleton
et al. did not report BAF values directly; however the reported data do
permit calculation of the ratio of boron concentration in the tissue to
boron in the diet, which represents a BAF. Pendleton et al reported that
the diet contained 1600 ppm added boron. The tissue/food ratio (BAF) was
thus less than 0.1. Pendleton et al. noted that boron was rapidly
eliminated within 1 day on a “clean diet.”
Stanley et al. (1996) also reported boron concentrations in mallard egg
and livers after feeding boron-added diets. Adult duck livers contained
4.6 mg B/kg and 8.5 mg B/kg when fed diets with 450 and 900 mg B/kg,
respectively. Duck eggs contained 6.5 and 11 mg B/kg, and duckling liver
contained 7.6 and 13 mg B/kg for the same diets. The tissue: food ratio
(BAF) was thus less than 0.1 for all tissues.
Data also exist for herbivorous mammals that confirm rapid elimination
of boron. Assuming first order kinetics for elimination, the half-life
was estimated to be approximately one hour for mice and less than 12
hours for rats (Farr and Konikowski 1963; Ku et al. 1991, 1993). In
rabbits, 50 to 66% of an orally administered dose of boric acid was
excreted in the urine in the first 24 hours after dosing (Draize and
Kelley, 1959). In cows, Owen (1944) observed essentially quantitative
recoveries of boron in the urine and feces of animals fed daily rations
fortified with borax
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