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Comparative studies on the extraction of Cu（Ⅱ） have been performed by 2-hydroxy-5-（1-methylheptyl） benzaldoxime （N-590） without or with n-dodecanol as modifier, 2-hydroxy-5- （1-metylheptyl） benzophenone oxime （N-510）, and 2-hydroxy-4-（1-methylheptyloxy） b