CBR = Critical body residue
The mathematical equation CBR = LC50 x BCF(bio concentration factor). Usually, when using this equation the duration of the LC50 and BCF should be matched. However, usually LC50 is conducted for 96 hrs and BCF test conducted for 28 days. Thus, for chemicals that do not reach steady state in 96 hrs can this CBR = LC50 x BCF equation be used?