Estimation of metal and metalloid in crude oil of newly developed oil field after acid digestion/extraction methods using different devices

•Screening of metals, metalloids in crude oil by ICP-OES, after digestion and extraction methods.•Recoveries of both elements from crude oil were optimum with microwave assisted acid digestion.•The recovery of as from crude oil was lower after conventional heating system.•Ultrasonic assisted extraction of elements from crude oil was easy, efficient and environmental friendly.•Arsenic and cadmium in crude oil create environmental problems after using in automobiles.