Sodium octane-1-sulphonate monohydrate

Density

Link to relevant study record(s)

Reference

Endpoint:

tap density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

24 April 2018

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Remarks:

Although a recognised guideline was followed, the study was not conducted under GLP conditions.

Qualifier:

according to guideline

Guideline:

OECD Guideline 109 (Density of Liquids and Solids)

Version / remarks:

02 October 2012

Deviations:

yes

Remarks:

Study was performed at (on average) 22 °C not 20.0 °C (as per guideline). Typical thermal expansion coefficients of solids are typically of the order of 10-5 °C-1. An average temperature delta of 2 °C is expected to be negligible.

GLP compliance:

no

Type of method:

pycnometer method

Dynamic viscosity of test material:

Not applicable, the test item is a solid.

Key result

Type:

tap density

Density:

0.96 g/cm³

Temp.:

22 °C

Remarks on result:

other: Mean Value

Remarks:

Mean value derived from the result of test 1 and test 2

Type:

tap density

Density:

0.98 g/cm³

Temp.:

22.1 °C

Remarks on result:

other: Test 1

Type:

tap density

Density:

0.94 g/cm³

Temp.:

21.9 °C

Remarks on result:

other: Test 2

Table 1:       Density Results

Tap Density	Test 1	Test 2	Mean
Mass of stoppered, 100 mL graduated cylinder (g)	98.25	94.24
Mass of graduated cylinder and test item (g)	107.76	106.28
Mass of test item (g)	9.51	12.04
Mass of graduated cylinder, test item and suspending solvent (g)	129.22	130.05
Mass of suspending solvent (g)	21.46	23.77
Density of suspending solvent at 22 °C	0.79	0.79
Volume of suspension (mL)	37.00	43.00
Volume of suspending solvent (mL)	27.30	30.24
Volume of test item	9.70	12.76
Tap Density of test item	0.98	0.94	0.96

Conclusions:

The mean tap density of the test item was determined to be 0.96 g/cm3 at 21.9 - 22.1 °C.

Executive summary:

OECD 109 – The tap density of the test item was determined utilising a procedure designed to be compatible with OECD 109 (adopted 02 October 2012).

Two determinations were carried out.  Aliquots of test item (9.5 – 12.04 g) were placed in a graduated cylinder and stoppered.  The cylinder, stopper and test item were weighed.  Suspending solvent (isopropyl alcohol) was added to the cylinder until the liquid level was above the suspended powder.  The stoppered cylinder was weighed again.  The graduated cylinder was then tapped multiple times.  The final suspension volume was measured and recorded using the liquid meniscus level as the final volume. The temperature of the suspension was then measured and recorded.

The mean tap density of the test item was determined to be 0.96 g/cm³ at 21.9 - 22.1 °C.

Description of key information

Tap Density: D = 0.96 g/cm³; OECD 109.; D McSherry (2018)

Additional information

OECD 109 – The tap density of the test item was determined utilising a procedure designed to be compatible with OECD 109 (adopted 02 October 2012).

Two determinations were carried out.  Aliquots of test item (9.5 – 12.04 g) were placed in a graduated cylinder and stoppered.  The cylinder, stopper and test item were weighed.  Suspending solvent (isopropyl alcohol) was added to the cylinder until the liquid level was above the suspended powder.  The stoppered cylinder was weighed again.  The graduated cylinder was then tapped multiple times.  The final suspension volume was measured and recorded using the liquid meniscus level as the final volume. The temperature of the suspension was then measured and recorded.

The mean tap density of the test item was determined to be 0.96 g/cm³ at 21.9 - 22.1 °C.