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EC number: 247-156-8
CAS number: 25640-78-2
Concentrations of Ruetasolv BP 4103
measured in samples eluted from column
at 0.4 mL/min
at 0.2 mL/min
All samples were checked negative for
colloidal dispersed material utilising the Tyndall effect.
The distribution of the two main
isomers of Ruetasolv BP 4103 altered from 46.57 % of isomer A and 53.43
% of isomer B in the calibration standards to 52.94 % of isomer A and
47.06 % of isomer B in the test item samples.
From the equations of the straight
"soluble" and "insoluble" sections of the turbidity
plot, a value of 0.4 mg/L was calculated for the water solubility of
(mono)isopropylbiphenyl (60/40 mixture of 3- and 4-isomer).
(section of plot representing soluble
concentrations: y = 0.12211x + 0.544443)
(section of plot representing
concentration above solubility: y = 1.39428x + 0.0773444)
Water solubility of (1-methylethyl)-1,1'-biphenyl was determined in a GLP guideline study according to OECD TG 105 using the column elution method. In three other valid experimental studies partly using different methods, similar results were obtained.
Water solubility of
(1-methylethyl)-1,1'-biphenyl was determined in five experimental
studies. Two were GLP guideline studies using the column elution method
(Lange/NOACK 2012 and Infracor 2004). Mendoza/DOW 1981 applied a special
nephelometric method utilising light scattering/turbidity to
characterise the concentration dependent presence of dissolved or
suspended material in the aqueous preparations. Addison 1983 and Ozburn
et al 1980 adopted the flask method. Results of the first four studies
fall in the same range (0.482, 0.28, 0.4 and 0.6 mg/L, respectively).
Water solubility of Ozburn was one order of magnitude lower (0.051
mg/L). This study was disregarded.
The studies of Lange/NOACK and
Infracor are guideline studies under GLP conditions with a reliability
of 1. The method used is most appropriate with respect to the solubility
of the substance. The guideline study with the result fitting better in
the range of solubilities determined was selected to represent the water
solubility of (1-methylethyl)-1,1'-biphenyl.
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