Stock and working solutions
Stock solutions of IMI and 6-ClNA at the concentration of
1mgmL1 were prepared in methanol. Working solutions of
mixed analytes were prepared weekly by dilutions in methanol
in the concentrations of 0, 0.05, 0.1, 0.25, 0.5, 1 and 10 lgmL1.
All working solutions were stored at 20 C.