Copper dichromium tetraoxide

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Experimental work started on 22 September 2017 and was completed on 12 February 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Version / remarks:

30 May 2008

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Version / remarks:

27 Jul 1995

GLP compliance:

yes

Type of method:

ring method

Test material

Test material information

Constituent 1

Reference substance name:

Copper dichromium tetraoxide

EC Number:

234-634-6

EC Name:

Copper dichromium tetraoxide

Cas Number:

12018-10-9

Molecular formula:

Cr2CuO4

IUPAC Name:

dichromium(3+) copper(2+) tetraoxidandiide

Test material form:

solid: particulate/powder

Specific details on test material used for the study:

Identification: Copper dichromium tetraoxide
Appearance/physical state: Dark blue powder
Batch: EX 14502.6
Purity: See certificate of analysis
Expiry date: 01 January 2023
Storage conditions: Room temperature, in the dark

Results and discussion

Surface tension

Key result

Surface tension:

68.6 mN/m

Temp.:

20 °C

Conc.:

90 vol%

Any other information on results incl. tables

The readings, times and temperatures for the sample solutions are shown in the following tables:

Table 2: Sample 1

Time (mins)	Reading (mN/m)	Temperature (°C)
75	68.5	20.0
85	69.5	20.0
94	69.5	20.0
104	69.5	20.0
114	69.5	20.0
124	69.5	20.0

Table 3: Sample 2

Time (mins)	Reading (mN/m)	Temperature (°C)
141	67.0	20.0
151	67.5	20.0
161	67.5	20.0
171	68.0	20.0
181	67.5	20.0
191	67.5	20.0

Mean Sample 1 result :  69.5 mN/m*

 

Mean Sample 2 result :  67.6 mN/m*

* The final five sample solution surface tension readings were considered to be on a stable plateau and used in the calculation of the mean.

Mean result    :  68.6 mN/m

pH of Sample 1 :  6.3

pH of Sample 2 :  6.4

Overall temperature  :  20.0 ± 0.5 ºC

Discussion

According to criteria mentioned in EC Method A.5, substances showing a surface tension lower than 60 mN/m under the conditions of this method should be regarded as being surface-active.

Applicant's summary and conclusion

Conclusions:

The mean surface tension of duplicate aqueous solutions of test item prepared at a 90 % saturation concentration has been determined to be 68.6 mN/m at 20.0 ± 0.5 °C. The test item was considered not to be surface-active.

Executive summary:

The study was conducted in compliance with Good Laboratory practice.

The surface tension of Copper dichromium tetraoxide was 68.6 mN/m (mean value from duplicate aqueous solutions of test item prepared at a 90 % saturation concentration) at 20.0 ± 0.5 °C, using a ring method designed to be compatible with Method A.5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for Testing of Chemicals, 27 July 1995.  The test item was considered not to be surface-active.