Ultrasound assisted dispersive solid phase microextraction of inorganic arsenic from food and water samples using CdS nanoflowers combined with ICP-OES determination

•CdS nanoflowers were utilized for simultaneous adsorption of As(III) and As(V).•Analytical method development based on nano-adsorbent.•Short analysis time.•The method was successfully applied for the determination of arsenic in food samples.