In situ enhanced hydrophobic character induced by clouding phenomenon in mixed micelles and CV-AAS for the determination of mercury in environmental SRMs

摘要

In situ enhanced hydrophobic character induced clouding phenomenon in mixed micelles was used for the separation and preconcentration of mercury from a variety of environmental matrices and determined using cold vapor atomic absorption spectrometry (CV-AAS). Mercury from bulk aqueous solution was extracted into a small mixed micelles-rich phase in the presence of HCl. The mercury vapors were generated by adding SnCl_2and HCl to these rich phases. The parameters affecting the extraction process were optimized. A preconcentration factor of nearly 40 times was obtained with limits of detection in the range of 0.041.22 ng g~(-1) for various reference materials. The recoveries were in the range of 92-103% at 1-3 ng mL~(-1). The accuracy of the procedure was validated by analyzing the various certified reference materials such as ERM CE278 Mussel Tissue, ERM CC580 Estuarine Sediment, BCR 397 Human Hair, BCR 482 Lichen, BCR 60 Aquatic Plant, and IAEA 350 Tuna Fish.