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EC number: 247-156-8
CAS number: 25640-78-2
Phototransformation in air
No data available (not required for
Due to its chemical structure,
(1-methylethyl)-1,1'-biphenyl cannot be hydrolysed. The structure of the
molecule does not contain any hydrolysable groups.
Phototransformation in water
Phototransformation in soil
Biodegradation in water: screening
Results of biodegradation tests with
(1-methylethyl)-1,1'-biphenyl are apparently inconsistent; however, two
studies are considered to be invalid and, hence, have been disregarded.
In one valid GLP-guideline study according to OECD TG 310 (Fiebig/Noack
2013), pass level for ultimate ready biodegradability (60% degradation
based on CO2 production) was reached, but the 10-day window was not met,
which in essence was 18 to 20 days. In the same test, primary
biodegradation was 97 % already after 6 days.
In the second test, a pre-guideline
study (Mendoza/DOW 1981) using a
test substance concentration below water solubility (< 0.5 mg/L), complete
Biodegradation in water and
sediment: simulation tests
No data available
Biodegradation in soil
Mode of degradation in actual use
Bioaccumulation: aquatic / sediment
The bioaccumulation potential of
(1-methylethyl)-1,1'-biphenyl was investigated in a pre-guideline study
similar to OECD TG 305 E based on uptake and depuration rate constant
(Ozburn et al 1980). BCF for low (3.5 µg/L) and high (24.1 µg/L) test
substance concentrations were 2896 and 10790, respectively. Especially
the second value seems extremely high for a substance with the structure
of isopropylbiphenyl. Validity of measured values were assessed
comparing them to BCF values of the supporting substance 4-ethylbiphenyl
and to BCF estimates for isopropylbiphenyl using several
calculation/QSAR methods. With the exception of one value (3471), all
comparative values were below 2000. The BCF value of 10790 is considered
to be not valid and is disregarded. As key value for
(1-methylethyl)-1,1'-biphenyl, the BCF of 2896 is taken.
Transport and distribution
Koc value for
(1-methylethyl)-1,1'-biphenyl was estimated using an accepted
calculation method (program KOCWIN v2.00 included in US EPA EPI Suite
4.11). A Koc (estimate from MCI) of 25055 (log Koc 4.3989) was
calculated (Wildschütte/MWC 2013) indicating distribution of
(1-methylethyl)-1,1'-biphenyl predominately in soil and sediment.
Henry’s Law constant
Henry's Law constant for
(1-methylethyl)-1,1'-biphenyl was determined using a batch air stripping
method (Mendoza/DOW 1981). HLC values were measured for both, the 3- and
4-isopropybiphenyl isomers present in the test substance. Values were
determined to be 173 and 238 Pa m³/mol, respectively, indicating only
moderate evaporation from water.
Results of distribution modelling with
a Fugacity level III model (component of US EPA EPI Suite 4.11) give
evidence that (1-methylethyl)-1,1'-biphenyl will be distributed mostly
into soil (ca. 80%) and to a much lesser extent into sediment (ca. 11%)
and water (ca. 8%). Percentage in air is minor (2.4%) (Wildschütte/MWC
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