Dilithium azelate

Additional information on environmental fate and behaviour

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

Reference

Reference 1

Reference Type:

study report

Title:

Unnamed

Year:

2018

Reference 2

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

Test material information

Constituent 1

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

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.