2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3,8-bis[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-, trisodium salt

Density

Link to relevant study record(s)

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017

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

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

Deviations:

no

Principles of method if other than guideline:

- Principle of test:
All procedures involving the pycnometer from wiping with the buckskin cloth to weighing were performed wearing cotton gloves. At all weighings, the corresponding temperature was recorded. All weighings were performed at 20.0 ± 0.4 °C. The determination was per-formed in duplicate
- Short description of test conditions:
The (cleaned) pycnometer was filled with replacement liquid, wiped again, and, after at least 10 minutes, weighed (M3). The pycnometer was then emptied, cleaned, and dried through rinsing with acetone and aeration with filtered air. Approx. 6 g of the ground test substance was filled into the pycnometer up to 2/3 of the volume of the pycnometer, the weight was recorded (M4). Then, replacement liquid was added to the mark and the pyc-nometer was weighed again (M5).
Before recording of the final weight, the pycnometer was set into an ultrasonic bath in order to remove any bubbles.

GLP compliance:

no

Other quality assurance:

ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)

Type of method:

pycnometer method

Key result

Type:

relative density

Density:

ca. 1.738 g/cm³

Temp.:

20 °C

The Test item was tested as delivered. Two test series with different weights were performed at ambient temperature (20.0 °C±0.24°C).

All measured values and the corresponding calculation results are given in the following table:

Table3‑a        Measured Values

First Determination				Error rel.	Error abs.
Weighing #	m1	m2	m3	m4	m5
Item	Pycn. empty	Pycn.+ H2O	Pycn. + repl.liq.	Pycn. + test item	Pycn. + test item + repl. liq.
Mass in g	36.7404	61.5986	56.3974	42.3714	59.4715
Temperature in °C	19.8	19.6	20.0	20.0	20.0
Second Determination				Error rel.	Error abs.
Weighing #	m1	m2	m3	m4	m5
Item	Pycn. empty	Pycn.+ H2O	Pycn. + repl.liq.	Pycn. + test item	Pycn. + test item + repl. liq.
Mass in g	36.7407	61.5968	56.3858	42.8443	59.7198
Temperature in °C	19.8	20.4	20.2	19.8	19.6

The following values were calculated.

Table4.‑a       Calculated Values

Parameter	Value	Unit	Standard Deviation	Relative Standard Deviation
Volume of Pycnometer	24.90	cm^3	0.0022	0.01%
Density of Test Substance	1.7385	g/cm^3	0.0001	0.00%
Density of Test Substance	1738.5	kg/m^3	0.1	0.00%
Relative Density of Test Substance	1.7385		0.0001	0.00%

Conclusions:

Using the pycnometer method, a density of 1.7385 ± 0.0011 g/cm3 at 20 ± 0.4 °C was measured. This value is the mean of two independent determinations with the maxi-mum error of a single determination.
Standard deviation was 0.0001 g/cm3, showing very good correlation of the two determi-nations.

Executive summary:

The density of Reactive Red Blendwell was determined using the picnometer method according to OECD 109 resp. EU A.3, the density was determined by mean of two test series at 20°.

Mean density for the two test series: 1.7385 ± 0.0011 g/cm³at 20±0.4 °C

Description of key information

Using the pycnometer method, a density of: : 1.7385 ± 0.0011 g/cm³at 20±0.4 °C was measured.

This value is the mean of two independent determinations with the maximum error of a single determination.

Standard deviation was 0.0001 g/cm³, showing very good correlation of the two determinations.

Key value for chemical safety assessment

Relative density at 20C:

1.738