Tar bases, coal, lutidine fraction

pH

Administrative data

Endpoint:

pH

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Experimental start date: 08 January 2016, Experimental completion date: 08 January 2016

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Report date:

2016

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: OECD TG 122: “Determination of pH, Acidity and Alkalinity” adopted 26 July 2013.

Deviations:

no

GLP compliance:

no

Remarks:

However, the study was performed in a test facility which has been certified to be in compliance with the principles of GLP.

Test material

Test material information

Constituent 1

Reference substance name:

Tar bases, coal, lutidine fraction

EC Number:

293-766-2

EC Name:

Tar bases, coal, lutidine fraction

Cas Number:

91082-52-9

IUPAC Name:

Tar bases, coal, lutidine fraction

Test material form:

liquid

Results and discussion

pH value

pH value:

ca. 9.1

Temp.:

25 °C

Concentration:

1 other: % w/v

Remarks on result:

other: Mean of two determinations with readings after 1 and 2 minutes; test item formed a clear colourless solution in water; pH of the high purity water used in the sample preparation: 5.7

Any other information on results incl. tables

Table 1: pH value determination

Determination	pH Value			Overall Mean pH
	After 1 Minute	After 2 Minutes	After 10 Minutes
1	9.12	9.07	not applicable	9.06
2	9.13	9.05	not applicable

Applicant's summary and conclusion

Conclusions:

In a valid, reliable and conclusive study according to OECD TG 122 (2013) the pH value of the test item was determined to be 9.1 at 25 °C in a 1% w/v aqueous solution.

Executive summary:

The pH vale of a 1% w/v aqueous solution of the test item was determined at 25 °C in a non-GLP study using an electronic pH meter according to the OECD TG 122 (2013) protocol. The experiment is considered relevant, adequate and conclusive.

An electronic pH meter, incorporating a 25 °C temperature compensation probe, was confirmed for satisfactory calibration at pH 4, pH 7 and pH 10 before use, using certified reference buffer solutions. After that an aliquot of test item (1.0118 g and 1.0064 g for determination A and B respectively) was added to 50 mL of high purity water (pH 5.7) and each sample was then diluted to 100 mL with high purity water. Finally, the samples were shaken vigorously for 1 minute. Each sample was then transferred to a glass beaker, allowed to settle for a period of 1 minute and the pH value then determined. The pH value was recorded from the pH meter, without stirring of the sample, after a period of 1 minute equilibration and a second reading was recorded after a period of 2 minutes equilibration. As the difference between the two readings did not exceed 0.1 pH units, the pH value was considered stable.

The test item formed a clear colourless solution in water at a loading rate of 1% w/v. The pH value in this aqueous solution, has been determined to be 9.1 at 25 ºC. This value was the mean of duplicate sample preparations, with an individual replicate pH value of 9.1 being obtained for both samples.