Method for extracting and comprising

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PROBLEM TO BE SOLVED : To provide an extractant which effectively extracts/separates a rare earth metal while minimizing a load on the environment, is extremely hardly soluble in water, can be completely incinerated, has superior extracting capability and selective separability both equivalent to an existing phosphorus-based compound (PC88A or D2EHPA), and is synthesized at a low cost, and to provide an extracting method using the same. SOLUTION : The extractant to be used for extracting/separating the rare earth metal is a CHON type extractant having a skeleton of a diglycolamic acid expressed by a specified formula (extractant which is composed of only carbon, hydrogen, oxygen and nitrogen, and can be completely incinerated), and is extremely hardly soluble in water (for instance, dioctyldiglycolamic acid (DODGAA)). COPYRIGHT : (C)2008, JPO&INPIT