Trimethyloctadecylammonium bromide

Density

Link to relevant study record(s)

Reference

Endpoint:

relative density

Type of information:

experimental study

Adequacy of study:

key study

Study period:

December 01, 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Qualifier:

according to guideline

Guideline:

other: ASTM D 1817-90

GLP compliance:

no

Type of method:

pycnometer method

Type:

density

Density:

ca. 1.124 other: g/ml

Temp.:

25 °C

Remarks on result:

other: average of the values reported for each test

Type:

relative density

Density:

ca. 1.12

Temp.:

25 °C

A volume equal to 50.307 ml was measured at 25 °C for Pycnometer 1, whereas a volume equal to 50.651 ml was measured at 25 °C for Pycnometer 2.

 

Determination of the volume of the pycnometers
		mass (g) pycnometer	mass (g) pycnometer + H2O	mass (g) H2O	volume pycnometer (ml)
Pycnometer 1	Test A	32.68521	82.8413	50.15609	50.30701
	Test B	32.68486	82.8417	50.15684	50.30776
Pycnometer 2	Test A	33.41191	83.9113	50.49939	50.65134
	Test B	33.41185	83.9109	50.49905	50.65100

 

In the Table reported above, the results observed from the test for the determination of the density at 25 °C of the test substance in water are reported.

From tests carried out in duplicate, Sample I returned an average value of density at 25 °C equal to 1.1239 g/ml.

From tests carried out in duplicate, Sample II returned an average value of density at 25 °C equal to 1.1247 g/ml.

From tests carried out in duplicate, Sample III returned an average value of density at 25 °C equal to 1.1250 g/ml.

Conclusions:

The value of the density at 25 ºC of the test item, obtained from the average of the values reported for each test, resulted of 1.124 g/ml.

Executive summary:

Method

The density of test substance has been calculated using a pycnometer as described in the ASTM D 1817 -90.

Discussion

The precision of the method establishes that tests performed in duplicate on a same sample should differ no more than 0.02 g/ml at 25 °C from each other. The measured values of the density at 25 °C of the test substance, observed both for tests performed in duplicate on a same sample and for tests performed on samples of different lots, do not differ more than 0.001 g/ml from each other. The tests performed have therefore a precision abundantly lower than the limit imposed by the method and they can be considered valid.

Conclusion

The value of the density at 25 °C of the test item, obtained from the average of the values reported for each test, resulted of 1.124 g/ml.

Description of key information

The density is 1.124 g/ml at 25 °C.

Relative density (25 °C) = 1.12

Additional information

The density of test substance has been calculated using a pycnometer as described in the ASTM D 1817 -90.