A rare metal concentration method from plating rinse water using homogeneous liquid-liquid extraction (HoLLE) with n-perfluorocarboxylic acid (C
6-C
8) was developed. After HoLLE, the volume ratio (
Va/
Vs) of the aqueous phase (
Va) and the sedimented liquid phase (
Vs) was 1,430 (50 mL → 0.035 mL).Of the cobalt, 99.7 % was extracted into the sedimented liquid phase.
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