Microwave assisted aqua regia extraction of thallium from sediment and coal fly ash samples and interference free determination by continuum source ETAAS after cloud point extraction

► Efficient microwave assisted aquarezia extraction of Tl from solid matrices (CFA, Sediment powders). ► Direct cloud point extraction from 20% aquarezia solution. ► Removal of interference from iron, sulfate and chloride. ► Clean up of Tl from environment. ► Limit of detection : water 2 pg/mL, CFA/sediment 200 pg/g.