Abstract：A novel method for separation and enrichment of nickel was established with microcrystalline thymolphthalein as adsorbent. The separation and enrichment behaviors of nickel and the conditions for its quantitative separation from common ions were explored. The enrichment mechanism of Ni2+ was discussed in detail. The results showed that at pH 8.0, in ammonium nitrate-diacetydioxime(DMG)-thymolphthalein(TP) system, the chelate precipitate [Ni(DMG)2] formed with nickel and DMG could be quantitatively adsorbed on the the surface of microcrystalline thymolphthalein to form liquid and solid phases with a clear interface, while manganese , copper , cadmium , aluminum and zinc could not be adsorbed, achieving the quantitative separation of nickel from these metal ions. Thus, a novel method for the separation and enrichment of nickel was established. The method was successfully applied to the quantitative separation of micro nickel in synthetic water samples with enrichment yield of 95.9 %-106.5 %.
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