“…[6][7][8] For determination and speciation of ultra trace concentrations of As in urine and whole blood samples an extraction procedure is necessary to get arsenic species in solution before analysis. Also, it requires sensitive analytical techniques such as; ion chromatography-inductively coupled plasma-mass spectrometry (IC-ICP-MS), high performance liquid chromatography coupled to inductively coupled plasma mass spectrometry (HPLC-ICP-MS), 9-11 coprecipitation, 12 inductively coupled plasma atomic emission spectrometry (ICP-AES), 13 HPLC coupled to inductively coupled plasma mass spectrometry, 14 hydride generation atomic absorption spectrometry (HGAAS), 15,16 hydride generation and atomic fluorescence spectrometry (HGAFS), 17,18 electrothermal atomic absorption spectrometry (ETAAS) 19 and chemiluminescence method 20 have been recommended for the purpose. Among them, HGAAS is probably the most common technique used for low level concentrations of As in biological samples, due to its high sensitivity, speed of analysis and minimum sample preparation.…”