2H-Tetrazol-5-amine, potassium salt (1:1)

Vapour pressure

Administrative data

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2009

Report date:

2009

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

effusion method: Knudsen cell

Test material

Test material information

Constituent 1

Reference substance name:

potassium 5-amino-1H-1,2,3,4-tetrazol-1-ide

Cas Number:

136369-04-5

Molecular formula:

CH2KN5

IUPAC Name:

potassium 5-amino-1H-1,2,3,4-tetrazol-1-ide

Test material form:

solid: particulate/powder

Details on test material:

Batch no.: 08KI030

Results and discussion

Vapour pressure

Key result

Temp.:

20 °C

Vapour pressure:

< 0 Pa

Remarks on result:

not measured/tested

Remarks:

No vapour pressure could be determined experimentally; as significance and reproducibility were not sufficient. Vapour pressure was calculated as upper limit from the start and end weights of the Knudsen cell after a time period of nine days. The value at 130°C was 2.2 * 10-04 Pa, indicating, that vapour pressure at 20 or 25°C should lie below 10-05 Pa.

Applicant's summary and conclusion

Conclusions:

No vapour pressure could be determined experimentally; as significance and reproducibility were not sufficient. Vapour pressure was calculated as upper limit from the start and end weights of the Knudsen cell after a time period of nine days. The value at 130°C was 2.2 * 10-04 Pa, indicating, that vapour pressure at 20 or 25°C should lie below 10-05 Pa as is expected for a substance with ionic character. No significant impact on the assessment of the test item’s behaviour in the environment is expected from the remaining uncertainty in vapour pressure. The result of the test is considered valid.

Executive summary:

The vapour pressure of 5-Aminotetrazol Potassium was determined following EU A.4 using the effusion method (weight loss). Two experiments were performed at the nominal temperatures 125 oC and 140 oC. No significant and reproducible weight loss was found. As higher temperatures could not be measured due to the limits of the test system, vapour pressure was calculated as upper limit using the weights at the start and at the end of the experiments. The limit vapour pressure at 130 oC is 2.19 * 10–04 Pa. It can therefore be assumed that vapour pressure at 20 oC and at 25 oC lies below 10-05 Pa.