Preconcentration of trace metals in natural waters with 2,2′-dipyridyl-4-amino-3-hydrazino-5-mercapto-1,2,4-triazolehydrazone supported on silica gel

The new hydrazone, supported on silica gel, is used to preconcentrate traces of copper, zinc, lead, nickel, cobalt and cadmium from tap, lake and sea water. Conditions for quantitative retention are established. Copper, zinc, lead, cadmium and nickel are quantitatively eluted with 0.1 M EDTA, and cobalt with 2 M perchloric acid. The metals are measured by atomic absorption spectrometry.