ANALYTICAL METHOD FOR THE DITHIOCARBAMATE FUNGICIDES ZIRAM AND MANCOZEB IN AIR - PRELIMINARY FIELD RESULTS

Airborne particulate residues that resulted from commercial applicatio ns of the dithiocarbamate fungicides ziram and mancozeb were trapped o n glass fiber filters at 14-16 L/min for up to 24 h. Hydrochloric acid hydrolysis, with stannous chloride reduction, was used to convert the se residues to carbon disulfide, which was partitioned into isooctane for assay using sulfur-mode flame photometric gas chromatography. Limi ts of detection were about 0.3 mu g (ziram) and 0.5 mu g (mancozeb) pe r filter, which were equivalent to about 14-23 ng/m(3) (24 h). Samples of these fungicides were collected during and following their applica tions and of mancozeb only in one ambient field situation. Measurable residues were detected up to 3 days after application within 18 m of t he treated fields. Concentration ranges in the field for detectable re sidues were 15-2300 ng/m(3) (ziram) and 48-1600 ng/m(3) (mancozeb).