Solid-liquid extraction spectrophotometric determination of copper with 2,9-dimethyl-1,10-phenanthroline

Bo Peng, Jinzhang Gao, Guanglin Hu, Haiyan Fan, Jingwan Kang, Hualing Deng

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Solid liquid extraction of copper ion (I) with 2,9-dimethyl-1,10-phenanthroline (neo-cuproine, DMP) into molten naphthalene followed by chloroform spectrophotometric determination was studied experimentally. The ternary complex Cu(I)-DMP-ClO4 was extracted quantitatively into molten naphthalene in the range of pH 5-6 at 85°C. Absorbance was spectrophotometrically determined at 459 nm against the reagent blank after the solid naphthalene layer was anhydrously dissolved in chloroform. Beer's law is obeyed over a concentration range of 0.5-70 μg/mL. The molar absorptivity and Sandell's sensitivity are 1.0 ×104 L/(mol·cm) and 0.0099 μm·cm2 respectively. In addition, the various conditions on determination and the interference of coexisted ions were discussed, and the method was applied to the determination of copper ion both in tea samples and cadmium sulfate reagents. The results are in good agreement with those obtained by ICP AES method.

Original languageEnglish
Pages (from-to)213-216
Number of pages4
JournalRare Metals
Issue number4
Publication statusPublished - Dec 1 2001


  • Copper
  • DMP
  • Molten naphthalene
  • Solid-liquid extraction
  • Spectrophotometric determination

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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