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EC number: 284-660-7
CAS number: 84961-70-6
The substance is an extremely complex hydrocarbon UVCB. The substance is
comprised of 21 different categories of components. The total number of
individual components is estimated to be nearly 1000. It has been
estimated that there are 210 possible isomers in the category of dialkyl
benzenes alone. Standard tests for this endpoint are intended for single
substances and are not appropriate for the risk assessment of this
complex substance. Further complicating the sediment testing of Benzene,
mono-C10-13-alkyl derivs., distn. residues is the extremely low water
solubility (WATERNT estimates from 2.61e-03 to 5.83e-07 mg/L), extremely
high log Kow’s (KOWWIN estimates from 7.87 to 19.62) and extremely high
log Koc’s (KOCWIN estimates from 5.21 to 11.30 L/kg) of the individual
components. These properties indicate that the Benzene,
mono-C10-13-alkyl derivs., distn. residues components will be tightly
bound to organic material in soil and sediments and will have little, if
Three terrestrial toxicity studies have been conducted on Benzene,
mono-C10-13-alkyl derivs., distn. residues. In an OECD 222 earthworm
reproduction study, concentrations of Benzene, mono-C10-13-alkyl
derivs., distn. residues of up to 1000 mg/kg (dry soil) had no effect on
any of the measured endpoints (adult mortality, adult body weight,
juvenile production). This resulted in NOECs of 1000 mg/kg (dry soil).
In an OECD 208 plant toxicity test, 10 plants species, representing both
monocots and dicots, were exposed to Benzene, mono-C10-13-alkyl derivs.,
distn. residues for 21 days. For all species tested, the EC50 values
were above the highest concentration tested while the NOECs ranged from
37 to 1000 mg/kg (dry soil) based on endpoints of emergence and growth.
An OECD 216 toxicity to microorganisms test was also conducted. Benzene,
mono-C10-13-alkyl derivs., distn. residues was added to soil, and the
nitrate formation measured after 28 days.The amount of nitrate formation
was inhibited -3.21% in the test replicates as compared to controls. The
EC50 based on inhibition of nitrate formation was >1000 mg/kg dry soil.
The NOEC was >= 1000 mg/kg dry soil.
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