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EC number: 259-105-7
CAS number: 54326-11-3
The SPME and Microtox results for the WAFs of the grease samples at 1000
mg/L loading rate are as follows:
The metal analyses were as follows:
Both sets of screening data confirm that there is no apparent toxicity
associated with any of the samples at the 1000 mg/L loading rate. The
SPME-GC data summarised above, supported by the chromatograms, confirm
that the total peak area counts are all extremely low and equivalent to
background readings associated with a control sample (i.e. a WAF without
any test sample added).
All of the results for calcium and lithium analysis were below the
limit of detection for the method, hence all results are reported as
The screening ecotoxicity data (using SPME-GC and the in-vitro Microtox
assay), confirm a lack of toxicity of the greases.
studies were undertaken on thickeners in base oils to provide additional
support to the grease thickener testing strategy. Information generated
during the screening studies is of relevance and value to the risk
assessment of a wide range of grease thickeners and is used to assess
the potential bioavailability of grease and other lubricant components.
approach for the organic complexes of the metal based grease thickeners
(lithium and calcium salts) was to use a solid-phase micro-extraction
(SPME) method combined with gas chromatography (GC) to assess the
bioavailability potential of the water accommodated fractions (WAFs) of
metal soap based grease. This approach was complemented with metal ion
analysis to determine whether the metal leaches out of the base grease
during WAF preparation.
screening studies were conducted in order to determine whether there was
any toxicity associated with the grease samples. The toxicity of WAFs
was monitored using anin vitroMicrotox assay, a biosensor-based
of the bioavailability potential of the water accommodated fractions
(WAFs), the metal ion analysis and the screening ecotoxicity of lithium
and calcium based complexes have been read across to aluminium based
thickeners. All of these metal salts of fatty acids are expected to
behave in a very similar manner when entrained within a grease matrix,
with high temperature stability indicating that the thickener structure
is robust and resistant to diffusion out of the oil.
of grease thickeners from grease into water is very unlikely as the
thickeners are poorly water soluble and the thickeners are embedded in
the hydrophobic grease matrix and thus unlikely to leach out. Metal
analyses confirm that there was no noticeable leaching of metal ions
from the grease samples and therefore no leaching of aluminium ions
would be expected either. The screening ecotoxicity data (using SPME-GC
and thein vitroMicrotox assay), confirm a lack of toxicity of the
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