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Density

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Reference
Endpoint:
density
Remarks:
density
Type of information:
experimental study
Adequacy of study:
key study
Study period:
29.06 - 16.07.2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study is recently performed according to OECD and GLP. The study is well documented and conducted.
Qualifier:
according to
Guideline:
OECD Guideline 109 (Density of Liquids and Solids)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.3 (Relative Density)
Deviations:
no
GLP compliance:
yes
Type of method:
pycnometer method
Specific details on test material used for the study:
Batch no.: P816P001
Expiry date: 03-01-2019
Storage: room temperature (20+/-5°C), away from light and humidity
Key result
Type:
density
Density:
1.449 g/cm³
Temp.:
20 °C
Remarks on result:
other: +/- 0.0003

Density ρ was calculated following the below equation:

ρtest = [(m4 - m1)/(m3 - m1) - (m5 - m4)] * ρverd

with: ρverd = density of replacement liquid in g/cm3

which can be calculated as follows:

ρverd= (m3 - m1)/(m2 -m1) * ρwater

with:

ρtest = density of solid test item in g/cm3

ρverd= density of replacement liquid in g/cm3

m1 = mass of empty pycnometer in g

m2 = mass of pycnometer with water in g

m3 = mass of pycnometer with replacement liquid in g

m4 = mass of pycnometer with solid test item in g

m5 = mass of pycnometer with replacement liquid and test item in g

The error was calculated following the below equation:

ρ = [(2 * ∆m * 100%) / (m4- m1)] + [(4 * ∆m * 100%) / (m3– m1) – (m5- m4)] + [2 * ∆m * 100%) / (m3- m1)] + [(2 * ∆m * 100%) / (m2- m1)]

with:

ρ = relative error of the measured density

m = absolute error of single weighing

Single determinations:

Determination

Density

(g/cm3)

Error of determination (g/cm3)

1

1.4475

0.0003

2

1.4294

0.0003

3

1.4505

0.0003

Note: the duplicate determination (exp 1 and 2) showed unusual variation. Therefore, a third determination was undertaken.

As the third determination confirmed the result of the first determination, experiments 1 and 3 were used for evaluation.

Conclusions:
The density of L-isoleucine is 1.4490 g/cm3 at 20°C.
Executive summary:

In the current study the density of L-Isoleucine was determined according to OECD test guideline 109. The study was GLP. Using the pycnometer method, the density of L-Isoleucine was determined to be 1.4490 ± 0.0003 g/cm3at 20.0 ± 0.4°C.

The standard deviation was 0.0021 g/cm3, showing a good correlation of the two determinations. Therefore, the study is considered valid.

Description of key information

The density of L-isoleucine is 1.4490 g/cm3 at 20°C.

Key value for chemical safety assessment

Relative density at 20C:
1.449

Additional information