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EC number: 800-940-9
CAS number: 35836-72-7
Measurement data at 30°C:
The data of the evaluated experiments
is presented in the following tables:
Date and time START
Date and time END
Measurement Data at 45°C :
26. Sep.2012 09:35
26. Sep.2012 12:30
26. Sep.2012 07:55
26. Sep.2012 12:00
26. Sep.2012 15:45
Observations: after three measurement
series at 30°C, the cells were almost empty. Therefore, the test was
continued with freshly filled cells at 45°C. After the measurements at
45°C, the test item was almost completely evaporated again and the test
Calculation Results :
All calculation results are given in
the tables below:
Real Temperature in K
Real Temperature in
Date of Measurement
Elapsed Time in s
to be used
Mean of measured values:
If “no” is stated in the respective
column: measurement was not considered for the calculation of the mean.
The “first” measurement series at
30°C was not used for evaluation as
the measurements at 30°C had to be started again with fresh cells.
Real Temperature in °C
The measured values for temperature
and vapour pressure were evaluated as follows:
For these two temperatures, 1/T was
plotted against log (P).The plotted graph 1/T vs. log (P) shows a
straight line with a correlation coefficientof
- 1.0000 as only two temperatures could be evaluated.
Parameters of the linear regression :
Correlation Coefficient r
y = -5202.4x + 17.869 (R² = 1)
The following vapour pressures were
determined experimentally and considered as valid (mean and standard
Stand. Dev. P
For the test item nopyl acetate, the
following vapour pressures at 20 °C and at 25 °C were calculated from
the regression equation:
Vapour pressure at 20 °C:
Vapour pressure at 25 °C:
regression of log p vs. 1/T gave a correlation coefficient r of - 1.0000 as
only two temperatures could be evaluated.
The vapour pressure of nopyl acetate
was determined at two different temperatures (30 and 45°C) following EU
Method A.4 using the effusion method (weight loss).
First, the determination was performed
at 30 °C.
As the apparatus had to be cleaned due
to contamination with bubbled over test items and too much test item was
already evaporated, freshly filled cells were used for the measurements
at 30°C. After three measurement series at 30 °C, the test item was
evaporated almost completely. Therefore, the test was continued at 45°C
with freshly filled cells and measurement intervals less than 24 hours
after consultation of the monitor because
the weight loss at 45 °C was too high for the usual time interval of one
day. The measured data showed good
correlation; therefore, this had no negative influence on the
At each temperature, four knudsen
cells were prepared and analysed in the same way.
values show very good reproducibility, giving relative standard
deviations of less than 10%, and good correlation. Due to the high
volatility of the test item no measurement at more than 45 °C were
vapour pressure of nopyl acetate was 1.33 Pa at 20°C and 2.63 Pa at
the vapour pressure lies in the limit range between the effusion method
(10-10 to 1 Pa) and the static method (10 to 105 Pa).
Even if the static method is theoretically applicable for vapour
pressures of 1 to 10 Pa, this method can be difficult to be performed
with terpenes and error-prone in lower pressure ranges as well.
Therefore, the effusion method, which was approved in the range of 1 - 5
Pa in some cases, was conducted. As the weight loss was very good
reproducible at both temperatures, the result was considered as reliable.
No observations arousing doubts
concerning the accuracy of the results and the validity of the study
were made. Therefore
the result of the test can be considered valid.
The vapour pressure was determined by the effusion method (weight loss). The vapour pressure of nopyl acetate is 1.33 Pa at 20 °C and 2.63 Pa at 25 °C.
Key study conducted according to OECD 104
Guideline and EU Method A.4, under GLP without deviation. No
observations arousing doubts concerning the accuracy of the results and
the validity of the study were made. Therefore, the study was considered
as reliable without restriction and the extrapolated
vapour pressures at 20 and 25°C can be used as key values
for chemical safety assessment.
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