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EC number: 215-125-8
CAS number: 1303-86-2
Oysters (C. gigas) were exposed to 1
µg B/ml and 10 µg B/ml above background for 47 days.At the highest
exposure concentration, boron tissue concentrations were 13 µg B/g by
day 36.By day 47 these concentrations decreased to 11µg B/g. After
cessation of exposure, tissue concentrations returned to background
levels (3.67 -4.01 µg B/g ) within 25 days. Thompson et al did not
calculate BCF values. Based on the data presented BCF values can be
calculated from 0.7 to1.4 L/kg. Low BCFs and reduction of tissue
concentrations during exposure suggests regulation and that boron will
not accumulate to high concentrations.
The results indicated that boron uptake
increased with increasing availability. Retention of boron within body
tissues of sockeye salmon after exposure was not investigated and no
evidence of active bioaccumulation was observed. The boron levels in
tissue of sockeye salmon were not significantly different from test
The boron levels in individual sockeye in
control seawater and two boron exposure tanks (after 3 weeks of
exposure) containing 10 µg/mL above background are reported herebelow
The concentrations measured in water,
organisms and BCF values for the spring and fall 1987 are presented in
the tables below. All data are shown, ie measurements above detection
limits and measurements below detection limit (= set at the detection
factors of <0.1 to 10.5 L/kg have been reported from laboratory tests of
fish and oysters (Hamilton and Wiedmeyer, 1990; Thompson et al. 1976).
Saiki et al. (1993) measured boron levels 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.
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