This book focused on reduction of interferences in trace and ultratrace element analysis in highly interferring matrices using eletrothermal atomic absorption sepctrometery. A quick survey on interference problems accompained with the commercially available ETAAS and several developments like two step atomizers and filter furnaces to overcome these problems, then introducing the new T-shaped furnace design, principle and a new concept of high temperature chromatography with ETAAS for backgroung-Analyte signals separation to obtain more accurate absorption values.