Registration Dossier
Registration Dossier
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EC number: 220-864-4 | CAS number: 2921-88-2
pH
Administrative data
- Endpoint:
- pH
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 015
- Report date:
- 2015
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7000 (pH)
- Deviations:
- no
- GLP compliance:
- yes
Test material
- Reference substance name:
- Chlorpyrifos
- EC Number:
- 220-864-4
- EC Name:
- Chlorpyrifos
- Cas Number:
- 2921-88-2
- Molecular formula:
- C9H11Cl3NO3PS
- IUPAC Name:
- O,O-diethyl O-3,5,6-trichloropyridin-2-yl phosphorothioate
- Test material form:
- solid
Constituent 1
- Specific details on test material used for the study:
- Substance ID: TSN308540
Purity: 98.0%
Reagents
- Reagent:
- other: Fisher pH buffers 4, 7 and 10
Titration of acidity and alkalinity
- Details on titrant used:
- A 1.00 wt% solution of the test substance was prepared by adding 0.5111 g of test substance to 50.3624 g of water and stirring in a beaker.
After the stirring was stopped, the pH electrode was immersed in the solution, and the pH and temperature of the solution were recorded. After stirring for an additional two to three minutes, an additional reading was recorded. A replicate pH determination was performed by preparing a 0.98 wt% solution of the test substance: 0.4930 g of test substance was mixed with 49.9681 g of water and the pH of the second solution was determined in the same manner as for the first sample aliquot. The first and second measurements were close enough that a third measurement was not taken. The pH of the test substance was reported as an average of the replicate samples.
Results and discussion
pH value
- Key result
- pH value:
- 4.04
- Temp.:
- 22.7 °C
- Concentration:
- 1 other: % wt/wt
Applicant's summary and conclusion
- Conclusions:
- pH of an approximately 1.00 % wt/wt solution is 4.04 at 22.7°C.
- Executive summary:
The study was performed to determine the pH of the test substance according to OPPTS 830.7000. A 1.00 wt% solution of the test substance was prepared by adding 0.5111 g of test substance to 50.3624 g of water and stirring in a beaker. The pH of an approximately 1.00 % wt/wt solution was 4.04 at 22.7°C.
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