3-mercaptopropionic acid

Density

Link to relevant study record(s)

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2008.10.09-2008.10.13

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Qualifier:

according to guideline

Guideline:

EU Method A.3 (Relative Density)

Principles of method if other than guideline:

The measurement was carried out by oscillating densitometry using procedures described in DIN 51757, complied with the method A3 of Commission Directive 440/2008/EC as of 30.05.2008 and method 109 of OECD testing guidelines for testing chemicals (27.07.1995).
Measurements are performed in compliance to ISO 9001 standards. The test report fully reflects the procedures and data generated.

GLP compliance:

no

Remarks:

Instead: DIN EN ISO 9001: 2000 management system certification (incl. certificate), TUEV NORD CERT GmbH, Germany

Type of method:

oscillating densitimeter

Type:

relative density

Density:

ca. 1.22

Temp.:

20 °C

Three measurements of relative density resulted in the following values: 1.2209, 1.2210 and 1.2210. Mean value of the realtive density was reported as 1.22096 +/- 0.000003 at 20 °C (293.15 K). The measured relative density of the test material differs lower than 0.01 %. Compared to the found deviation of the value for the water calibration these findings are considered as accurate.

Conclusions:

The realtive density of the test substance 3-mercaptopropionic acid has been determined to be 1.22096 +/- 0.000003 at 20 °C (293.15 K).

Executive summary:

The test material 3 -mercaptopropionic acid has been determined to have the relative density 1.22096 +/- 0.000003 at 20 °C (293.15 K) by oscillating densitometry using procedures described in DIN 51757, complied with the method A3 of Commission Directive 440/2008/EC as of 30.05.2008 and method 109 of OECD testing guidelines for testing chemicals (27.07.1995).

Description of key information

Relative density: 1.22096 +/- 0.000003 at 20 °C (293.15 K)

Key value for chemical safety assessment

Relative density at 20C:

1.2

Additional information

The study performed in experimental laboratory (Smolin, 2009, Bruno Bock) dedicated to estimate the density of the test material 3-mercaptopropionic acid has been chosen as a key study. The relative density has been determined to be 1.22096 +/- 0.000003 at 20 °C (293.15 K), by oscillating densitometry using procedures described in DIN 51757, complied with the method A3 of Commission Directive 440/2008/EC as of 30.05.2008 and method 109 of OECD testing guidelines for testing chemicals (27.07.1995).

The supporting study reports similar relative density value: 1.22 at 25 °C (Rampy, 1973, Dow). The key study reports density at recommended temperature. The differences in densities reported by key study and supporting study may be caused by differences in test substance compositions (no data available for supporting study).