Synergistic solvent extraction of copper, cobalt, rhodium and iridium into 1, 2-dichloroethane at trace level by newly synthesized 25, 26, 27, 28-tetrahydroxy-5, 11, 17, 23-tetra-[4-(N-hydroxyl-3-phenylprop-2-enimidamido) phenylazo] calix[4]arene

Ashok Kumar, Pratibha Sharma, Lal Kumar Chandel, Bhagwan Lal Kalal, Sandor Kunsagi-Mate

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Abstract

A spectrophotometric method for determination of copper, cobalt, rhodium and iridium ions from nitric acid media after extraction of these ions by 25, 26, 27, 28-tetrahydroxy-5, 11, 17, 23-tetra-[4-(N-hydroxyl-3-phenylprop-2- enimidamido) phenylazo] calix [4] arene (THPAC) has been developed and possible synergistic effect has been investigated. The maximum enhancement was obtained in the presence of 30% 1, 2-dichloroethane in DMF and 3M nitric acid. The trace amounts of the metal were determined spectrophotometrically. Beer's law was obeyed in concentration range 5.0-10.0 μg, 6.0-120.0 μg, 12.0-100.0 μg, and 10.0-130.0 μg/10 mL of the final solution of copper, cobalt, rhodium and iridium, respectively. The molar absorptivities (l mol-1 cm -1) and Sandell's sensitivities (μg cm-1) were calculated: Cu (II) = 0.96 × 104, 0.0066; Co (II) = 1.13 × 104, 0.0052; Rh (III) = 0.98 × 104, 0.012; and Ir (III) = 2.03 × 104, 0.0095, respectively. Seven replicate analyses containing of 20.0 μg of Cu (II), 24.0 μg of Co (II), 36.0 μg of Rh (III) and 25.0 μg of Ir (III) gave mean absorbance 0.302, 0.462, 0.344, 0.264; and relative standard deviation 0.65, 0.85, 1.10, 1.08%, respectively. The interference of various ions was studied and optimum conditions were developed for determination of metals in certain alloys, environmental, pharmaceutical and synthetic samples.

Original languageEnglish
Pages (from-to)285-292
Number of pages8
JournalJournal of Inclusion Phenomena and Macrocyclic Chemistry
Volume62
Issue number3-4
DOIs
Publication statusPublished - Dec 1 2008

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Keywords

  • Calixarene
  • Cobalt
  • Copper
  • Diluents
  • Iridium
  • Rhodium
  • Spectrophotometric determination
  • Synergistic extraction

ASJC Scopus subject areas

  • Food Science
  • Chemistry(all)
  • Condensed Matter Physics

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