(second step). Three voltammetric analytical procedures including dc-polarography, differential-pulse adsorptive
stripping voltammetry and square-wave adsorptive stripping voltammetry were optimized for the direct determination of bulk nitroxynil. The three
proposed procedures were applied for analysis of bulk nitroxynil with limits of detection of 3 × 10−5, 1.31 × 10−8 and 8.4 × 10−10 M and limits
of quantification of 1 × 10−5 , 4.36 × 10−8 and 2.80 × 10−9 M, respectively.