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EC number: 283-392-8
CAS number: 84605-29-8
mean water solubilities for mixing times of 4, 24 and 48 hours are shown
6. Results of Water Solubility Analysis -Mean Water Solubility at
Different Shaking Times
Shaking time (hours)
Sum of GC Peak Areas
Mean Water Solubility (mg/L)
*Mean Water Solubility (mg/L)
* mean calculated from 24 and 48 hour
7. Precision and Accuracy of GC-MS Method
% of Nominal
water solubility of the test substance was determined by the shake flask
method according to guidelines in OECD 105.
of the water soluble components in the ZDDP (zinc
dialkyldithiophosphate) test material was performed by GC-MS (gas
chromatography-mass spectrometry) following derivatization of the water
soluble portion to halogenated derivatives with pentafluorobenzyl
bromide CASRN 1765-40-8. Identification
of the water soluble components was based on a combination of GC
retention times and the interpretation of the fragmentation patterns in
the mass spectra obtained for each peak eluted from the GC column.
of the study indicate the water solubility of the test material is 2764
mg/L at 22 degrees. The
GC data indicate the water solubility of this substance is dependent on
the length of carbon chain of the alkyldithiophosphate ligands. The
lower molecular weight zinc dialkyldithiophosphates containing C3
(isopropyl) alkyl groups are preferentially soluble over the higher
molecular weight zinc dialkyldithiophoshates containing all C6
(1,3-dimethyl) alkyldithiophosphate ligands.
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