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Environmental fate & pathways

Additional information on environmental fate and behaviour

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Administrative data

Endpoint:
additional information on environmental fate and behaviour
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Referenceopen allclose all

Reference Type:
study report
Title:
Unnamed
Year:
2018
Reference Type:
study report
Title:
Unnamed
Year:
2017
Report date:
2017

Materials and methods

Principles of method if other than guideline:
The main purpose of this study is to provide data on the leachability of lithium dicarboxylate thickeners base grease samples in demineralized water.
GLP compliance:
no
Type of study / information:
Leaching of the thickener from base grease into water

Test material

Constituent 1
Chemical structure
Reference substance name:
Dilithium adipate
EC Number:
242-449-7
EC Name:
Dilithium adipate
Cas Number:
18621-94-8
Molecular formula:
C6H8O4.2Li
IUPAC Name:
dilithium adipate
Constituent 2
Chemical structure
Reference substance name:
Lithium 12-hydroxystearate
EC Number:
231-536-5
EC Name:
Lithium 12-hydroxystearate
Cas Number:
7620-77-1
Molecular formula:
C18H36O3.Li
IUPAC Name:
lithium 12-hydroxyoctadecanoate
Test material form:
other: Grease: Lithium soaps in base oil
Details on test material:
- Source: ERGTC
- Storage: Room temperature, protected from light
Specific details on test material used for the study:
- Analysis: Lithium and adipate will be measured in the studies as a surrogate for the sample

Results and discussion

Any other information on results incl. tables

Table 1- Bioaccessibility test results for dilithium adipate

 

Measured conc. in WAF (mg/L)

Dilithium adipate leached from base oil (%)

Lithium

0.55

17.39

Adipate

4.5

13.70

Applicant's summary and conclusion

Conclusions:
It was concluded that dilithium adipate leaches into water, but the grease base appears to limit the bioaccessibility of the substance to less than 20% of the theoretical maximum dilithium adipate concentration as measured in the WAF.
Executive summary:

Leaching studies were undertaken by conducting analysis on water accommodated fractions (WAF) samples prepared at 1000 mg/L with base oil or base grease samples (dilithium adipate at 3.6% and lithium 12 -hydroxystearate at 9.4% in distillates (petroleum) hydrotreated heavy naphthenic base oil). The measured concentrations of lithium (0.55 mg/L) and adipate (4.5 mg/L) in the WAF of the leaching studies were equivalent to concentrations of 6.26 and 4.95 mg/L dilithium adipate respectively. It was concluded that dilithium adipate leaches into water, but the grease base appears to limit the bioaccessibility of the substance to less than 20% of the theoretical maximum dilithium adipate concentration as measured in the WAF.

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