Spectrophotometric method for the determination of ziram and zineb with 1-(2-thiazolylazo)-2-naphthol (TAN) using Triton X-100 as the solubilizing agent

A new, rapid, sensitive and selective method has been developed for the determination of ziram and zineb using 1-(2-thiazolylazo)-2-naphthol (TAN) as the complexing reagent in the pH range of 8.0-8.5 in the presence of octylphenolpoly(ethylene glycol) ether i.e. Triton X-100. The violet complex shows lambda(max) at 580 nm. The molar absorptivity is 7.52 x 10(4) dm(3) mol(-1) cm(-1) for ziram and zineb and Sandell's sensitivity 0.0040 and 0.0036 mug cm(-2) for ziram and zineb, respectively. The method has been used for direct determination of ziram and zineb in synthetic mixtures, commercial formulations and crops residue.