Trifluoromethanesulphonic acid

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising liquids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 29 June 2012 to 05 February 2013

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.21 (Oxidising Properties (Liquids))

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Contact with:

powdered cellulose

Key result

Sample tested:

test mixture 1:1

Parameter:

preliminary test

Remarks on result:

maximum pressure of 2070 kPa not reached

Remarks:

The determination of the oxidizing properties of the test item wasn't possible according to UN Method O.2. The test item isn't considered as oxidizing based on its chemical structure.

Key result

Sample tested:

test mixture 1:1

Parameter:

preliminary test

Remarks on result:

not determinable

Remarks:

The test item charred the cellulose

Results of the main test:

The test item charred the cellulose like concentrated sulphuric acid. The cellulose turned black during dropwise addition of the test item. While mixing test item and cellulose, the mixture became hot and yielded a black granulate with white spots. No ignition was observed. After consultation of the national reference institute (BAM, Bundesanstalt für Materialprüfung) the test is not conductable as no mixture with cellulose can be tested, because the cellulose reacts with the test item to a mixture of charred cellulose containing only residues of test item and cellulose.

The time intervals which were recorded between the lower pressure value (690 kPa) and the upper pressure value (2070 kPa) in each experiment are presented in the following table and in Attachment 1:

Content of Test System	Time lapse between 690 kPa and 2070 kPa [s]
Test Item Trifluoromethanesulfonic acid and Cellulose	Only a maximum pressure of 257.929 kPa was reached
Reference Item Nitric Acid and Cellulose (only to ensure correct working of the test system)	5.47 s

Expert statement on oxidising properties

Definition following EU-Method

A liquid substance or mixture is classified as oxidising if the following test criteria are met: the liquid to be tested is mixed in a 1 to 1 ratio, by mass, with fibrous cellulose and introduced into a pressure vessel. If during mixing or filling spontaneous ignition occurs, no further testing is necessary. If spontaneous ignition does not occur the full test is carried out. The mixture is heated in a pressure vessel and the mean time taken for the pressure to rise from 690 kPa to 2070 kPa above atmospheric is determined. This is compared with the mean pressure rise time for the 1:1 mixture of the reference substance(s) and cellulose. The reference is nitric acid of 65 % and analytical grade.

 Following GHS:

"An oxidising liquid is a liquid which, while in itself not necessarily combustible, may, generally by yielding oxygen, cause, or contribute to, the combustion of other material."

"An oxidising gas is any gas which may, generally by providing oxygen, cause or contribute to the combustion of other material more than air does."

Results of the expert statement:

The determination of the oxidizing properties of the test item was not possible according to EU-Guideline A.21 and UN Method O.2 (GHS) after consultation of the national reference institute (BAM, Bundesanstalt für Materialprüfung) as the test item charred the cellulose. In a measurement of the mixture which was conducted regardless this fact the pressure didn’t rise above 690 kPa. A measurement with 65% nitric acid and cellulose showed correct working of the test system. The chemical structure does not contain any groups associated with oxidising properties (see Attachment2).Therefore, the test item should be considered as not oxidizing.

Interpretation of results:

GHS criteria not met

Conclusions:

The determination of the oxidizing properties of the test item wasn't possible according to UN Method O.2. The test item isn't considered as oxidizing based on its chemical structure.

Executive summary:

The study was performed according to Method A.21 of Commission Regulation (EC) N° 440/2008 of 30 May 2008 and GLP. A deviation not affecting the quality of the study was observed.

The liquid is mixed in a 1 to 1 ratio, by mass, with fibrous cellulose and introduced into a pressure vessel. The mixture is heated in a pressure vessel and the mean time taken for the pressure to rise from 690 kPa to 2 070 kPa above atmospheric is determined. This is compared with the mean pressure rise time for the 1:1 mixture of the reference item (nitric acid 65%)and cellulose.

The test item charred the cellulose like concentrated sulphuric acid. The cellulose turned black during dropwise addition of the test item. While mixing test item and cellulose, the mixture became hot and yielded a black granulate with white spots. No ignition was observed. After consultation of the national reference institute (BAM, Bundesanstalt für Materialprüfung) the test is not conductable as no mixture with cellulose can be tested, because the cellulose reacts with the test item to a mixture of charred cellulose containing only residues of test item and cellulose.The test item isn't considered as oxidizing based on its chemical structure.

Description of key information

Experimental determination of oxidising properties: test item not oxidising

Key value for chemical safety assessment

Oxidising properties:

no

Additional information

The study was performed according to Method A.21 of Commission Regulation (EC) N° 440/2008 of 30 May 2008 and GLP.

The test item charred the cellulose like concentrated sulphuric acid. The cellulose turned black during dropwise addition of the test item. While mixing test item and cellulose, the mixture became hot and yielded a black granulate with white spots. No ignition was observed. After consultation of the national reference institute (BAM, Bundesanstalt für Materialprüfung) the test is not conductable as no mixture with cellulose can be tested, because the cellulose reacts with the test item to a mixture of charred cellulose containing only residues of test item and cellulose.