Cobalt(III) Tetramethylenedithiocarbamate as a New Flotation Collector for Preconcentration and Separation of Lead Determinated by Zeeman ETAAS - Enimiteva et al. page 5


The investigations prove that cobalt(III) tetramethylene­dithio­carbamate can be used successfully for precipitation and separation of lead traces from water matrices. Lead was determined with recovery of 98.44 %. Optimal experimental parameters were pH 6.0, mass of cobalt 3.5 mg, amount of 0.4 mmol TMDTC-. NaDDS was used as a foaming reagent. The proposed flotation procedure by using Co(TMDTC)3 as a collector has the advantage because the use of only one surfactant requires a smaller amount of acid and consequently the matrix of the final solution is less complex.
The excellent recoveries of lead, as well as the validation by the method of standard adition, evidence the successfulness of the method recommended. The procedure is rapid (about 25–30 min) and extends the range of conventional ETAAS determination. The necessary equipment for flotation is simple and low cost. The use of a small amount of surfactant and fine air bubbles necessary to perform the proper flotation does not allow for any serious contamination risks which could result in high blank values.