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EC number: 203-016-8
CAS number: 102-24-9
The tests fulfilled the validity criteria of sufficient growth (control
growth rate was 0.054 h-1) and a minimum increase of test medium pH
(highest pH was 8.3)
Algal Endpoint values
TMBX is hydrolytically unstable and breaks
down to form methanol and boric acid in the presence of water, these
species can be expected to be found folllowing release to the
environment. Therefore, an assessment of ecotoxicological potential was
conducted taking account of the effects of the hydrolysis breakdown
products of TMBX upon the different trophic levels.
The 96 hour toxicity of methanol to Pseudokirchneriella subcapitata was
established in a static system (Cho et al 2008), the ErC50
was determined to be 18260 mg/L (nominal) based on growth rate.
The acute aquatic toxicity of borates to freshwater algae
(Pseudokirchneriella subcapitata) was examined under static conditions
by Hanstveit and Oldersma (2000). The calculated ErC50 at
72hrs was 52.4 mg/L expressed as elemental Boron. The respective EC10
and NOEC were 35 mg/L and 17.5 mg/L.
The acute aquatic toxicity to marine algae (Phaeodactylum tricornutum) was
determined in a static system (Rebstock et al 2011). The 72-hour ErC50,
based on mean measured total boron concentrations, was estimated to be
66 mg B/L with 95% confidence limits of 63.5 and 67.7 mg B/L; The
72-hour EC10 and NOEC values were 50.7 and 27.9 mg B/L, respectively,
based on total measured boron concentrations.
Based on the above results, the ErC50 and NOEC values for
boron were used to calculate equivalent values for TMBX:
Freshwater 72 hr ErC50= 52.4 x (173.5/32.4) = 280.6 mg/L
Freshwater 72 hr NOEC=17.5 x (173.5/32.4) = 93.7 mg/L
Seawater 96 hr ErC50= 66 x (173.5/32.4) = 353.4 mg/L
Seawater 72 hr NOEC=27.9 x (173.5/32.4) = 149.4 mg/L
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