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Endpoint:
other: pH and conductivity
Type of information:
experimental study
Study period:
April 2019
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Cross-referenceopen allclose all
Reason / purpose for cross-reference:
reference to same study
Reference
Endpoint:
other: pH and conductivity
Type of information:
experimental study
Study period:
April 2019
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
no guideline followed
Principles of method if other than guideline:
TiO2 dispersion was prepared by adding the 1 wt. % of TiO2 powder to deionised water. The dispersion was placed on magnetic stirrer (1500 rpm) for 15 minutes to ensure that the powder is fully dispersed. The pH and conductivity were measured using a pH and conductivity meter (Five Easy pH Meter F20-Std-Kit, Mettler Toledo). The pH and conductivity meter was calibrated with standard buffers and conductivity standards prior to use. The measurement was carried out at ambient temperature.
GLP compliance:
no
Specific details on test material used for the study:
Product name: Sample G2-5
Appearance: white odourless powder
Substance stability: Stable under normal conditions
Substance humidity: 8.4
Results:
The pH and conductivity were measured after 1 wt.% TiO2 dispersion in deionised water was prepared.
- pH: 8.1
- conductivity: 147 µS/cm

No information was provided regarding sample make up.
Conclusions:
The equilibrium pH and conductivity of a the TiO2 sample G2-5 dispersed at 1%w/w in deionised water were determined to be:
- pH: 8.1
- conductivity: 147 µS/cm
Reason / purpose for cross-reference:
reference to same study
Reference
Endpoint:
other: pH and conductivity
Type of information:
experimental study
Study period:
April 2019
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
no guideline followed
Principles of method if other than guideline:
TiO2 dispersion was prepared by adding the 1 wt. % of TiO2 powder to deionised water. The dispersion was placed on magnetic stirrer (1500 rpm) for 15 minutes to ensure that the powder is fully dispersed. The pH and conductivity were measured using a pH and conductivity meter (Five Easy pH Meter F20-Std-Kit, Mettler Toledo). The pH and conductivity meter was calibrated with standard buffers and conductivity standards prior to use. The measurement was carried out at ambient temperature.
GLP compliance:
no
Specific details on test material used for the study:
Product name: Sample G6-3
Appearance: white odourless powder
Substance stability: Stable under normal conditions
Substance humidity: 0.4
Results:
The pH and conductivity were measured after 1 wt.% TiO2 dispersion in deionised water was prepared.
- pH: 6.2
- conductivity: 134.9 µS/cm

No information was provided regarding sample make up.
Conclusions:
The equilibrium pH and conductivity of a the TiO2 sample G6-3 dispersed at 1%w/w in deionised water were determined to be:
- pH: 6.2
- conductivity: 134.9 µS/cm
Reason / purpose for cross-reference:
reference to same study
Reference
Endpoint:
other: pH and conductivity
Type of information:
experimental study
Study period:
April 2019
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
no guideline followed
Principles of method if other than guideline:
TiO2 dispersion was prepared by adding the 1 wt. % of TiO2 powder to deionised water. The dispersion was placed on magnetic stirrer (1500 rpm) for 15 minutes to ensure that the powder is fully dispersed. The pH and conductivity were measured using a pH and conductivity meter (Five Easy pH Meter F20-Std-Kit, Mettler Toledo). The pH and conductivity meter was calibrated with standard buffers and conductivity standards prior to use. The measurement was carried out at ambient temperature.
GLP compliance:
no
Specific details on test material used for the study:
Product name: Sample G8-2
Appearance: white odourless powder
Substance stability: Stable under normal conditions
Substance humidity: 0.6
Results:
The pH and conductivity were measured after 1 wt.% TiO2 dispersion in deionised water was prepared.
- pH: 7.3
- conductivity: 22.4 µS/cm

No information was provided regarding sample make up.
Conclusions:
The equilibrium pH and conductivity of a the TiO2 sample G8-2 dispersed at 1%w/w in deionised water were determined to be:
- pH: 7.3
- conductivity: 22.4 µS/cm
Reason / purpose for cross-reference:
reference to same study
Reference
Endpoint:
other: pH and conductivity
Type of information:
experimental study
Study period:
April 2019
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
no guideline followed
Principles of method if other than guideline:
TiO2 dispersion was prepared by adding the 1 wt. % of TiO2 powder to deionised water. The dispersion was placed on magnetic stirrer (1500 rpm) for 15 minutes to ensure that the powder is fully dispersed. The pH and conductivity were measured using a pH and conductivity meter (Five Easy pH Meter F20-Std-Kit, Mettler Toledo). The pH and conductivity meter was calibrated with standard buffers and conductivity standards prior to use. The measurement was carried out at ambient temperature.
GLP compliance:
no
Specific details on test material used for the study:
Product name: Sample G10-4
Appearance: white odourless powder
Substance stability: Stable under normal conditions
Substance humidity: 0.4
Results:
The pH and conductivity were measured after 1 wt.% TiO2 dispersion in deionised water was prepared.
- pH: 2.8
- conductivity: 890.3 µS/cm

No information was provided regarding sample make up.
Conclusions:
The equilibrium pH and conductivity of a the TiO2 sample G10-4 dispersed at 1%w/w in deionised water were determined to be:
- pH: 2.8
- conductivity: 890.3 µS/cm

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2019
Report date:
2019

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
TiO2 dispersion was prepared by adding the 1 wt. % of TiO2 powder to deionised water. The dispersion was placed on magnetic stirrer (1500 rpm) for 15 minutes to ensure that the powder is fully dispersed. The pH and conductivity were measured using a pH and conductivity meter (Five Easy pH Meter F20-Std-Kit, Mettler Toledo). The pH and conductivity meter was calibrated with standard buffers and conductivity standards prior to use. The measurement was carried out at ambient temperature.
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
Titanium dioxide
EC Number:
236-675-5
EC Name:
Titanium dioxide
Cas Number:
13463-67-7
Molecular formula:
O2Ti
IUPAC Name:
dioxotitanium
Test material form:
solid: particulate/powder
Details on test material:
Appearance: white odourless powder
Relative density: ~ 3.9
Specific details on test material used for the study:
Product name: Sample G1-1
Substance stability: Stable under normal conditions
Substance humidity: 0.9

Results and discussion

Results:
The pH and conductivity were measured after 1 wt.% TiO2 dispersion in deionised water was prepared.
- pH: 4.1
- conductivity: 53.6 µS/cm

No information was provided regarding sample make up.

Applicant's summary and conclusion

Conclusions:
The equilibrium pH and conductivity of a the TiO2 sample G1-1 dispersed at 1%w/w in deionised water were determined to be:
- pH: 4.1
- conductivity: 53.6 µS/cm