Barium bis[2-[(2-hydroxy-1-naphthyl)azo]benzoate]

Solubility in organic solvents / fat solubility

Administrative data

Endpoint:

solubility in organic solvents / fat solubility

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Test procedure according to method of Analytical Expert Group ETAD (Ecological and Toxicological Association of Dyes and Organic Pigment Manufacturer)

Cross-reference

Reason / purpose for cross-reference:

reference to same study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2014

Report date:

2014

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: Analytical Expert Group ETAD

Principles of method if other than guideline:

About 5 mg of the test sample were suspended in 30 ml octanol (Aldrich, spectrophotometric grade) in a sample flask (standard flask for the Büchi Rack R-24, volume 30 ml) and were shaken for two hours at 30°C (+/- 2°C) on a "Büchi Syncore Polyvap" with 400 rpm. Then shaking was continued at ambient temperature (22 - 23°C) for 70 hours, followed by filtration 3 times through a 0.2 µm membrane filter.
The resulting clear solution was measured by UV-vis spectrometry and the absorption was determined at 490 nm. The determination was repeated three times.

Calibration for determination of concentration of the samples applying the Lambert-Beer rule: calibration curve of Pigment Red 50:1 in trifluoro acetic acid.

Test material

Test material information

Constituent 1

Reference substance name:

Barium bis[2-[(2-hydroxy-1-naphthyl)azo]benzoate]

EC Number:

228-906-3

EC Name:

Barium bis[2-[(2-hydroxy-1-naphthyl)azo]benzoate]

Cas Number:

6372-81-2

Molecular formula:

C17H12N2O3.1/2Ba

IUPAC Name:

barium bis{2-[(2-hydroxy-1-naphthyl)diazenyl]benzoate}

Results and discussion

Solubility in organic solvents / fat solubility

Medium:

n-octanol

Solubility:

<= 0.64 mg/L

Temp.:

22 °C

Remarks on result:

other: mean of 3 measurements

Test substance stable:

yes

Any other information on results incl. tables

_{The solubility of the sample C.I. Pigment Red 50:1 in n-octanol at ambient temperature, determined under the conditions as mentioned above, is 0.64 mg/L (mean, n = 3, sigma= 0.04).}

Table 1: Individual results

	Adsorption (d = 10 cm)	mg/L
a1	0.5105	0.61
a2	0.5139	0.62
a3	0.5709	0.69