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EC number: 213-651-2
CAS number: 998-40-3
The calculation method was used for a preliminary estimation of the Pow
of the test item. Calculation was performed using the Rekker calculation
method (PrologP 6.0, module in Pallas 3.0, CompuDrug International, San
Francisco, CA, USA). The Pow of the test item was calculated to be 5.9 x
10e6 (log Pow 6.8) using the Rekker calculation method. Based on the
calculation it was decided to perform the HPLC method for the
determination of the Pow of the test item.
The HPLC Pow and log Pow values of the test
item at pH 7 and pH 11 were:
Test item – peak 1
Test item – peak 2
Test item – peak 3
Test item – peak 4
Test item – peak 5
Test item – peak 6
Tributylphosphine oxidizes readily in contact with water. The Pow of the
test item was calculated to be 5.9 x 10e6 (log Pow 6.8) using the Rekker
The OECD 117 test measured 6 peaks in the HPLC analysis corresponding to
6 different hydrolysis products (no analytical monitoring could be done
to determine what these products were). The log Pow measured for the
major component (largest peak area measured) was 3.1 at pH 7 and 3.0 at
pH 11. When taking into account the peaks from the components above that
indicates that in total the log Pow is >= 3.1 for 86.4% of the analysed
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