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EC number: 290-714-0
CAS number: 90218-39-6
250.4 mg of the test item were put into 250 ml of de-ionized water
and stirred at ambient temperature for 22 h. The test item appeared to
be not completely solved after the stirring period and showed some
colourless particles. Therefore the solution was filtered over 0.2 µm
HPLC-filter. The filtered solution was slightly turbid. Therefore after
filtration the solution was not diluted. After adapting to 20 °C the
measurement of the surface tension with the test item was carried out at
20 ±0.5°C (19.8 °C), as follows:
The solution to be measured was transferred to the measurement
vessel, taking care to avoid foaming. The measurement vessel was placed
on the table of the test apparatus. The measurement vessel was raised
until the ring was immersed below the surface of the solution. The time
from starting the measurement was recorded (see Table1 below).
Subsequently, the table top was lowered gradually and evenly at a rate
of 0.3 cm/min to detach the ring from the surface until the maximum
force was reached. The force was read on the tensiometer. The
measurements were repeated until 6 measurements werewithin the limits of
the stability criterion.
Table1: Surface tension
s(mN/m)corrected according to Zuidema and Waters
Due to the fact that the surface tension showed a time-dependence
no mean value could be reported. However, the surface tension was higher
than 60 mN/m, the test item had no surface-active properties.
H., Waters, C.W.,Ind. Eng.Chem.
(1941), S. 312
The surface tension of the solution at 20 °C was higher than 60
mN/m. The test item had no surface-active properties.
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