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EC number: 946-949-2
CAS number: -
substance did not change in appearance under the conditions used in the
Table 1. Vapour pressure data at 25 °C
Log10[Vp (25 ºC)]
1.03 x 10-2Pa
Table 2. Vapour pressure at 99 °C
The vapour pressure of the magnesium
sulfonate read-across substance (CAS 231297-75-9) was
determined using the effusion method (vapour pressure balance) according
to OECD Guideline 104 / EU Method A.4 (Tremain, 2012). The temperature
was controlled electronically. Using the cross-section, a diagram ws
drawn and the system was evacuated. Afterwards the shutter was opened
above the sample oven, which directed the escaping vapour jet towards
the scale pan. The difference in mass reading the orifice covered and
uncovered is proportional to the vapor pressure at the given oven
temperature. A preliminary run was undertaken over the temperature range
20 °C to 114 °C in order to provide information for a suitable
temperature range for the main test. A final sequence of ten runs was
started after a sample of test substance had been under vacuum for
approximately 69 1/4 hours. Temperature and pressure readings were taken
between 90 and 100 °C with a one hour dwell at 90 °C between runs. As
result, the vapour pressure at 25 °C was determined as 0.01 Pa and at 99
°C the value is given as 0.457 Pa, respectively.
Finally, the vapour pressure of this C20-24
mono-alkylated benzene sulfonate is expected to be similar to
‘Benzenesulfonic acid, di-C10-14-alkyl derivatives, calcium salts’ and
acceptable for read-across.
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