Table 1: Concentrations [g/kg] used for the two-level assessment.

Factor/Level Low (-1) High (+1)
X1=pyrene 0 5.0 x 10-3
X2=copper sulphate 0 1.25x10-3
X3=peptone 0 10.0
X4=Tween 80 2.5 10.0
X5=lecithin 0 30.0
X6=chrysene 0 5.0 x 10-3