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环烷酸是一元羧酸类萃取剂,它可将镧系元素及其它金属离子萃入到各种有机溶剂中。环烷酸对稀土离子的萃取是按阳高子交换机理进行：
Naphthenic acid is a monocarboxylic acid extractant, it can lanthanide and other metal ions extracted into a variety of organic solvents. Naphthenic acid extraction of rare earth ions is based on positive high-sub-exchange mechanism: