New Cadmium(II)-Selective Electrode Based on a Tetraazacyclohexadeca Macrocyclic Ionophore Ashok

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  • SINGH Ashok Kumar
    Department of Chemistry, Indian Institute of Technology-Roorkee
  • SAXENA Puja
    Department of Chemistry, Indian Institute of Technology-Roorkee
  • SINGH Rupam
    Department of Chemistry, Indian Institute of Technology-Roorkee

書誌事項

タイトル別名
  • New Cadmium(II)-Selective Electrode Based on a Tetraazacyclohexadeca Macrocyclic Ionophore
  • New Cadmium 2 Selective Electrode Based on a Tetraazacyclohexadeca Macrocyclic Ionophore

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説明

A poly(vinyl chloride)-based membrane of 3,4:11,12-dibenzo-1,6,9,14-tetraazacyclohexadecane with sodium tetraphenyl borate (NaTPB) as an anion excluder and dibutylphthalate (DBP), dibutyl(butyl)phosphonate (DBBP), tris(2-ethylhexyl)phosphate (TEHP) and tributyl phosphate (TBP) as a plasticizing solvent mediator was prepared and investigated as a Cd2+-selective electrode. The best performance was observed with the membrane having a ligand-PVC-DBP-NaTPB composition of 2:25:60:1, which worked well over a wide concentration range (1.6 × 10-6 - 1.0 × 10-1 M) with a Nernstian slope of 29.5 mV per decade of activity between pH 2.0 - 6.0. This electrode showed a fast response time of 13 s and was used over a period of 4 months with good reproducibility (S = 0.4 mV). The selectivity coefficient for mono-, di- and trivalent cations indicated excellent selectivity for Cd2+ ions over a large number of cations. Anions such as NO3- and SO42-, did not interfere. The membrane sensor has been successfully used to determine Cd2+ in real samples.

収録刊行物

  • Analytical Sciences

    Analytical Sciences 21 (2), 179-181, 2005

    社団法人 日本分析化学会

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