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EC number: 283-392-8
CAS number: 84605-29-8
1. Results of 5 -day Preliminary Hydrolysis Test (at 50 0C)
Approx. saturation concentration (ppm)
Starting Concentation (ppm)
% recovery after 5 days
100% recovery of dialkyldithiophosphate with an exchange of zinc in the
parent compound for the
sodium of the pH 9 buffer occurred.
Tier 1 preliminary hydrolysis study was performed according the OECD 111
guideline, Annex 1, tiered hydrolysis scheme. Mixtures
of the test substance were prepared in buffers at pH 4, 7 and 9 and
maintained at 50 degrees C for 5 days. Following the 5 day incubation,
mixtures were evaluated by 31P-NMR (phosphorus-Nuclear Magnetic
Resonance) spectroscopy for depletion of the alkyldithiophosphate
signals between 112 - 108 ppm and the appearance of other peaks which
could be identified as hydrolysis products.
pH 4, 7 and 9, the 31P-NMR spectra showed a change of < 10% in the
concentration of the alkyldithiophosphate ligands bound to the zinc
metal indicating the substance meets the OECD 111 criterion for a
hydrolytically stable material.
pH 9, the zinc metal was exchanged for the sodium of the buffer forming
a sodium salt with the alkyldithiophosphate ligands remaining intact. In
the exchange, the zinc metal was precipitated as insoluble zinc
oxide/hydroxide. No other peaks besides the alkyldithiophosphates
(between 112 – 108 ppm) were detected in the NMR spectrum.
on the results of the 5-day Tier 1 preliminary test, the substance was
determined to be hydrolytically stable and a full study is not required.
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