2-(p-Iodophenyl)-3-(p-nitrophenyl)-5-phenyltetrazolium tetrakis(1-imidazolyl)borate as a reagent for the determination of nickel, zinc, cobalt and iron by flame atomic absorption spectrometry

The precipitated 2-(p-iodophenyl)-3-(p-nitrophenyl)-5-phenyltetrazolium tetrakis (1-imidazolyl)borate formed by the reaction between the respective chloride and sodium salts was found to be an excellent adsorber for heavy metal ions in solution. A procedure is described for the in situ solid-liquid chelate adsorptive separation and flame atomic absorption spectrometric determination of trace amounts of Ni, Zn, Co and Fe.