Content Handbook F

Outline of method

The ultraviolet spectrum is recorded in the range of 200-400 nm on the filtrate of an ethylenebis(dithiocarbamate) water dispersion. Absorbance values are measured at 280-285 nm for the EBDC anion, using a linear baseline procedure. Zineb, mancozeb, and mixtures of maneb and water-soluble zinc salts give an absorbance not exceeding 0.05 absorbance units, whereas maneb, and mixtures of maneb with zineb or insoluble zinc salts give an absorbance higher than 0.05 absorbance units (typically in the range of 0.1 to 0.7 absorbance units).

Scope

This method, measuring the water solubility of different EBDC compounds, is useful to differentiate zineb, mancozeb, and mixtures of maneb and water- soluble zinc salts from maneb, and mixtures of maneb with zineb or insoluble zinc salts.