Abstract
Extraction behaviour of copper from Yunnan red soil by EDTA and citric acid were investigated. The influencing factors of EDTA and citric acid extraction were obtained. The EDTA and citric acid composite extraction for copper was also tested. The result showed that the extraction of copper for the system of low concentration citric acid (0.003 mol/L EDTA+0.05 mol/L) can reach to 64.8%, which is very close to that for thesystem of high concentration citric acid (0.003 mol/L EDTA+0.1 mol/L citric acid) (64.9%), and is high than that for 0.01 mol/L EDTA (61.1% )and 0.1 mol/L citric acid (61.2%).
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