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EC number: 200-753-7
CAS number: 71-43-2
The 32 day NOEC is 0.8 mg/L for Pimephales promelas.
Broderius (1991) studied the toxicity of benzene in an early life stage
test with Pimephales promelas. The exposure concentrations were
measured at least twice a
week during the exposure period. The most sensitive endpoint reported by
the authors is a LOEC of 1.6 mg/L for wet weight and length. This
value was the most conservative reliable chronic endpoint for freshwater
fish identified in the EU RAR for benzene (2008). As the effect observed
at this concentration was between 10 -20% a NOEC can be calculated by
dividing the LOEC by two.
Black et al (1982) report a more sensitive EC10 this value was
discounted in the EU RAR for benzene (2008) and so is discounted here
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