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An adsorption apparatus has a column having an adsorbent filling space filled with an adsorbent. The adsorbent has a surface and its vicinity mainly comprises an apatite which is represented by the formula (Ca1-aMa)10(PO4)6((OH)1-bXb)2, where the M represents at least one kind of rare earth metal elements, the X represents at least one kind of halogen elements, 0
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