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The test substance rapidly decomposes in contact with water forming a range of breakdown products. The test substance can only be analysed after derivatisation, but using derivatisation, a distinction between intact test substance and breakdown products can no longer be made, this is a prerequisite for the hydrolysis study. In addition, the expected water solubility is very low and at these low levels it is often difficult if not impossible to prevent adsorption of test substance to the vials or containers used. In conclusion, the hydrolysis of the test substance could not be performed (Baltussen, E., 2010, Determination of physico-chemical properties of octyltintris (2 -ethylhexyl mercaptoacetate), Notox project nº492800).