Bismuth citrate

Oxidising properties

Link to relevant study record(s)

Reference

Endpoint:

oxidising solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

20 October 2011 to 10 November 2011

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Study conducted in accordance with EU Guideline.

Qualifier:

according to guideline

Guideline:

EU Method A.17 (Oxidising Properties (Solids))

Deviations:

no

GLP compliance:

no

Contact with:

powdered cellulose

Sample tested:

test mixture (not specified)

Remarks:

migrated information

Parameter:

maximum burning rate

Result:

1.1 other: mm/s (migrated information)

Sample tested:

reference mixture (not specified)

Remarks:

migrated information

Parameter:

maximum burning rate

Result:

1.57 other: mm/s (migrated information)

Preliminary Test

Three test mixtures with the test item and cellulose 2:1 did not burn with a flame after the ignition source was removed. The mixtures continued to smoulder for approximately 7 minutes.

Three test mixtures with barium nitrate/cellulose 2:1 burned down completely in 75 s, 74 s and 76 s, respectively.

Due to the results of the preliminary test the full test had to be performed.

Three tests were performed for the reference mixture (barium nitrate and cellulose) with 40, 50, 55, 60 and 70 wt. % oxidizer (barium nitrate). The results are shown in the following table:

Barium nitrate [wt.%]	Burning time over 200 mm [s]	Burning rate [mm/s]
50	149	1.34
55	136	1.47
60	127	1.57
70	180	1.11

 

The highest burning rate 1.57 mm/s was found for the mixture with 60 wt.% oxidizer.

Mixtures of the test item with cellulose were prepared with 10, 15, 20, 30, 40, 50, 70, 80, 90 and 100 %.

The following table shows the results:

 

Test item [%]	Burning time over 200 mm [s]	Burning rate [mm/s]
10	187	1.07
15	189	1.06
20	181	1.10
30	230	0.87
40	241	0.83
50	577 (the flame extinguished after 174 s and the mixture continued to smoulder, the time given here was measured after 200 mm)	0.35
70	467	0.43
80	376	0.53
90	245	0.82
100	188	1.06

 

Due to the fact, that the maximum burning rate of the mixtures of the test item with cellulose is lower than the burning rate of the reference mixture, six additional tests for the test item mixture were performed for the mixtures with the highest burning rates of 10, 15 and 20 wt. % of the test item.

Test:	t[s]	V[mm/s]	Us]	V[mm/s]	t[s]	V[mm/s]	t[s]	V[mm/s]	t[s]	V[mm/s]	t[s]	V[mm/s]
10%	187	1.07	204	0.98	192	1.04	184	1.09	181	1.10	197	1.02
20%	181	1.10	184	1.09	197	1.02	183	1.09	194	1.03	193	1.04
15%	189	1.06	193	1.04	196	1.02	200	1.00	188	1.06	184	1.09

 

The maximum burning rate of the mixtures of the test item and cellulose (1.10 mm/s) was lower than the maximum burning rate of the reference mixture of cellulose and barium nitrate (1.57 mm/s).

Interpretation of results:

other: no oxidising properties

Remarks:

Migrated information

Conclusions:

The maximum burning rate of the mixtures of the test item and cellulose (1.10 mm/s) was lower than the maximum burning rate of the reference mixture of cellulose and barium nitrate (1.57 mm/s).
Due to the fact that the mixture of the test item with cellulose burned slower compared to the reference mixture, or the flame extinguished before the pre-burning phase was finished, it was concluded that the test item has no oxidizing properties.

Executive summary:

The purpose of this study was the determination of the oxidizing properties of the test item, bismuth subsalicylate, according to the European Commission Regulation (EC) No. 440/2008, Part A: Methods for the determination of physico-chemical properties. A. 17. Oxidizing properties of solids.

The maximum burning rate of the mixtures of the test item and cellulose (1.10 mm/s) was lower than the maximum burning rate of the reference mixture of cellulose and barium nitrate (1.57 mm/s).

               

Due to the fact that the mixture of the test item with cellulose burned slower compared to the reference mixture, or the flame extinguished before the pre-burning phase was finished, it was concluded that the test item has no oxidizing properties.

Description of key information

Bismuth citrate is not oxidising.

Key value for chemical safety assessment

Oxidising properties:

no

Additional information

A study was conducted to determine the oxidising properties of the test item, bismuth citrate, according to the European Commission Regulation (EC) No. 440/2008, Part A: Methods for the determination of physico-chemical properties. A. 17. Oxidizing properties of solids.

Due to the fact that the mixture of the test item with cellulose burned slower compared to the reference mixture, or the flame extinguished before the pre-burning phase was finished, it was concluded that the test item has no oxidising properties.

Justification for classification or non-classification

The substance has been shown to have no oxidising properties therefore it is not classified.