2-[[4-[ethyl(2-hydroxyethyl)amino]phenyl]azo]-6-methoxy-3-methylbenzothiazolium chloride

Density

Link to relevant study record(s)

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

August 15, 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Deviations:

no

GLP compliance:

no

Type of method:

air comparison pycnometer (for solids)

Key result

Type:

density

Density:

1.35 g/cm³

Temp.:

20 °C

Key result

Type:

relative density

Density:

1.35 other: dimensionless

Temp.:

20 °C

Individual results

A measurement chamber with a volume of V_c= 141.8361 cm³ and an expansion chamber with a volume of V_r= 69.3167 cm³ were used. These volumes were selected to reduce a negative influence by heterogeneity of the test item on the measurement.

Two test series with different weights were performed at ambient temperature (20.0 °C). For results see Table1 and Table2.

Table1: Results of the 1^sttest series

Weight: 69.7394 g		p1/ psi		p2/ psi		Volume / cm^3		DensityrPR/ g·cm^-3
1^stmeasurement		19.533		11.041		51.7130		1.3486
2^ndmeasurement		19.563		11.058		51.7122		1.3486
3^rdmeasurement		19.512		11.028		51.7342		1.3480
Mean						51.7198		1.3484

Table2: Results of the 2^ndtest series

Weight: 67.9453 g		p1/ psi		p2/ psi		Volume / cm^3		DensityrPR/ g·cm^-3
1^stmeasurement		19.569		11.129		50.4350		1.3472
2^ndmeasurement		19.598		11.146		50.4253		1.3474
3^rdmeasurement		19.551		11.119		50.4305		1.3473
Mean						50.4302		1.3473

Mean density for the two test series: 1.3479 g/cm³

Relative density (compared to water at 4 °C):

D₄^R= 1.35      (20.0 °C)

Conclusions:

The relative density at ambient temperature (compared to water at 4 °C) was determined to be:
D4R= 1.35      (20.0 °C)

Executive summary:

The density determination was performed with the gas comparison pycnometer according to OECD 109. The aparatus with a measured amount of the test item in the measurement chamber is swept 10 times with 19.5 psi Helium (purity min. 99.99 %) at a constant and

regulated environmental temperature. Thereafter, the valve to the expansion chamber (volume = V_r) is opened and a certain amount of gas expands from the measurement chamber (volume = V_c) containing the test item to the expansion chamber. The volume of the test item V_s is calculated of the pressure drop from p₁to p₂ caused by the gas expansion. Two individual test series containing three measurements were performed. The density was calculated from the mass of the sample and its measured volume for each measurementbwfore the results were averaged. The estimated accuracy of this method is ±0.01 g/cm³.

The relative density at ambient temperature (compared to water at 4 °C) was determined to be:

D₄^R= 1.35      (20.0 °C)

Description of key information

The density determination was performed with the gas comparison pycnometer according to OECD 109.

The relative density at ambient temperature (compared to water at 4 °C) was determined to be:

D₄^R= 1.35      (20.0 °C)

This information is used in a read-across approach in the assessment of the target substance.

For justification of read-across please refer to the attached read-across report (see IUCLID section 13).

Key value for chemical safety assessment

Relative density at 20C:

1.35