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Diss Factsheets

Physical & Chemical properties

pH

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Administrative data

Endpoint:
pH
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2005

Materials and methods

Test guidelineopen allclose all
Qualifier:
equivalent or similar to guideline
Guideline:
other: JIS Z 8802 (1984)
Deviations:
not applicable
Qualifier:
equivalent or similar to guideline
Guideline:
other: ISO 4316-1977 (E)
Deviations:
not applicable
Qualifier:
equivalent or similar to guideline
Guideline:
other: ASTM D 1172
Deviations:
not applicable
GLP compliance:
no

Test material

Constituent 1

Results and discussion

pH value
pH value:
7.3
Temp.:
40 °C
Concentration:
1 other: %

Any other information on results incl. tables

 Temperature ºC  pH 4  pH 7  pH 9  pH 10
 0 4.01  6.98  9.46  10.32 
 5 4.01  6.98  9.39  10.25 
 10 4.00  6.92  9.33  10.18 
 15 4.00  6.90  9.27  10.12 
 20 4.00  6.88  9.22  10.07 
 25 4.01  6.86  9.18  10.02 
 30 4.01  6.85  9.14  9.97 
 35 4.02  6.84  9.10  9.93 
 40 4.03  6.84  9.07  9.91 (38ºC)
 45 4.04  6.83  9.04   
 50 4.06  6.83  9.01   
 55 4.08  6.84  8.99   
 60 4.10  6.84  8.96   
 70 4.12  6.85  8.92   
 80 4.16  6.86  8.88   
 90 4.20  6.86  8.88   
 95 4.22  6.87  8.83   

Applicant's summary and conclusion

Conclusions:
This standard method is applied to measure pH of raw materials and products. The result to one decimal of pH was 7.3 (1%, 40ºC)
Executive summary:

The pH is hydrogen ion (H+) concentration and expressed as minus logarithm (10) of hydrogen ion concentration.

The official documents based on JIS Z 8802 (1984), ISO 4316 -1977 (E), ASTM D 1172. This standard method is applied to measure pH of raw materials and products. The result to one decimal of pH was 7.3 (1%, 40ºC).