Registration Dossier
Registration Dossier
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EC number: 231-778-1 | CAS number: 7726-95-6
pH
Administrative data
- Endpoint:
- pH
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Data accepted by a national regulatory agency
Data source
Reference
- Reference Type:
- publication
- Title:
- Bromine Final Registration Review Decision Case 4015
- Author:
- US Environmental Protection Agency OPPTS
- Year:
- 2 010
- Bibliographic source:
- US EPA Prevention, Pesticides, and Toxic Substances, Docket number EPA-HQ-OPP-2009-0167
- Report date:
- 2010
Materials and methods
Test guideline
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- EPA OPPTS 830.7000 (pH)
Test material
- Reference substance name:
- Bromine
- EC Number:
- 231-778-1
- EC Name:
- Bromine
- Cas Number:
- 7726-95-6
- Molecular formula:
- Br2
- IUPAC Name:
- dibromine
- Details on test material:
- - Name of test material (as cited in study report): Bromine
- Analytical purity: Technical Grade Active Ingredient 98-100%
Constituent 1
Results and discussion
Any other information on results incl. tables
Tap water has the capacity to buffer the effect on pH by the addition of bromine.
Bromine, mg/L |
pH value |
0 |
7.2 |
2.5 |
7.2 |
16.3 |
7.2 |
29.2 |
7.3 |
When bromine is added to deionized water, bromine reduces the pH since hypobromous acid, a weak acid, is formed. Deionized water has no buffer capacity so the pH of the solution decreases.
Bromine, mg/L |
pH value |
0 |
5.6 |
1.0 |
5.3 |
11.0 |
4.1 |
19.4 |
3.8 |
50.0 |
3.4 |
Applicant's summary and conclusion
- Conclusions:
- The effect of bromine on pH of aqueous solutions depends on the type of water used for dilution. Tap water has buffering capacity, so that little change is seen in pH from that of the control solution. (0% bromine pH 7.2 vs 29.2 mg/l bromine pH 7.3) Deionized water lacks the buffering capacity, and the pH of the solution decreases as hypobromous acid, a weak acid, is formed. (0% bromine pH 5.6 vs 50.0 mg/L bromine pH 3.4).
- Executive summary:
The effect of bromine on pH of aqueous solutions depends on the type of water used for dilution. Tap water has buffering capacity, so that little change is seen in pH from that of the control solution. (0% bromine pH 7.2 vs 29.2 mg/l bromine pH 7.3) Deionized water lacks the buffering capacity, and the pH of the solution decreases as hypobromous acid, a weak acid, is formed. (0% bromine pH 5.6 vs 50.0 mg/L bromine pH 3.4).
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