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Physical & Chemical properties

Stability: thermal, sunlight, metals

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Administrative data

Endpoint:
stability: thermal, sunlight, metals, other
Remarks:
Migrated from section 'Stability: thermal, sunlight, metals'
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Acceptable, study report which meets basic scientific principles

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1991
Report Date:
1991

Materials and methods

Test guideline
Qualifier:
no guideline available
Principles of method if other than guideline:
The thermal stability of FAS aqueous solution was determined at 20 °C, 40 °C and 60 °C, at different pH conditions and as well as under air or nitrogen atmosphere.
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): FAS
- Analytical purity: not available

Results and discussion

For thermal stability study

Test substance thermally stable:
no
Operating temperature
Operating temp.:
20 - 40 °C
Sublimation:
not determined
Transformation products:
not measured

Any other information on results incl. tables

The aqueous FAS-suspension shows worse stability than the dry product. The decomposition starts after 6-12 h at room temperature, and after several minutes at 40 °C. The supsension decomposes faster when it was stirred slowly (4 - 8 h). During the decomposition process, the pH value and redox potential decrease (pH: start 2.9 to end 2.5 - 2.2; redox-potential: start + 40 mV- + 80 mV to end - 400 mV), accompanied with H2S odor. At 60 °C the formation yellow sulfur flock can be observed after 2 days.

Also when the measurement is carried out in nitrogen atmosphere or at a pH of 4-5, no improvement of stability can be obtained.

Applicant's summary and conclusion