Total arsenic and selenium analysis in Marcellus shale, high-salinity water, and hydrofracture flowback wastewater

► Total arsenic and selenium quantitation in highly saline flow back wastewater. ► A modified thiol cotton fiber with centrifugation technique was employed. ► Application to samples of Marcellus shale following microwave digestion. ► Extraction of Se from Marcellus shale by highly saline flow back water is higher.