Arsenic determination in complex mining residues by ICP OES after ultrasonic extraction

► The use of ultrasound bath for arsenic extraction can be used without analyte loss until 180 minutes of sonication. ► Operational conditions established for arsenic extraction were acid concentration (HNO3) of 2.7 mol L− 1 and sonicating for 136 minutes. ► Application and recovery studies with real samples close to 100% of extraction.