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EC number: 203-016-8
CAS number: 102-24-9
Value from generally accepted authoritative secondary source. No data
available for temperature and pH value.
All concentrations of the n-octanol phases are corrected with the
recovery of the extraction, as shown in the tables below.
Results of the partition test:
Conc. n-octanol phase (g/L)
Conc. aqueous phase (g/L)
Mean log Pow
0.513 (pH 7.5)
0.519 (pH 7.5)
0.304 (pH 7.5)
0.302 (pH 7.5)
0.579 (pH 7.5)
0.548 (pH 7.5)
Mean value of all determinations: Series 1, 2 and 3:
Pow= 0.081 ±
0.16 (22 ±
The recovery of the partition test is calculated with the concentrations
of the stock solution which was analysed by means of HPLC.
Determination of the recovery:
Results of the recovery test after extraction with 0.01 N H2SO4:
The mean value of the recovery of the two solutions is 72 ±
TMBX is hydrolytically unstable and experimental derivation of a octanol
water partition coefficient is technically not possible. A value of
-5.67 is predicted by KOWWIN v1.68 however given the hydrolytic
instability of the substance this cannot be considered reliable. TMBX
hydrolyses to form methanol and boric acid, both of which are
toxicologically significant species and the partition coefficients for
these breakdown products should be considered instead. The log partition
coefficient n-octanol/water (Log Pow) of boric acid was measured to be
-1.09 ± 0.16 (22 ± 1 ºC). The value for the log Pow of Methanol is
reported to be -0.77 from a reliable peer-reviewed handbook source.
Based upon the most sensitive environmental toxicity studies available,
the partition coefficient for Boric acid was selected as the most
appropriate value for the Chemical Safety Assessment.
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