Ultrasonic-assisted Oxalic Acid Extraction of Copper from Plateau Red Soil and Tessier Speciation Evaluation

摘要

The copper in plateau red soil was extracted by ultrasonic-assisted oxalic acid. Tessier fractional extraction method was used to evaluate copper speciation. The result showed that the biggest extraction rate was 69%. Compared with oscillation extraction, the extraction rate of ultrasonic extraction was increased by 7.18% under the condition of 0.1 mol/L oxalic acid, 20:1 of liquid-solid ratio and 30 min of extraction time. Ultrasound could promote the oxalic acid extraction of copper from plateau red soil effectively, which could be attributed the success to the activation effect of ultrasound on bound to carbonates speciation and bound to iron and manganese speciation.