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  • Chem Sci Trans., 2014, 3(1),  pp 171-180  

    DOI:10.7598/cst2014.677

    Research Article

    Thiacalix[4]arene Derivative as Potential Carrier for Cadmium Sensing using PVC Membrane Electrode

  • SANJAY KUMAR and DHARMENDRA SINGH SIDDHU
  • Department of Chemistry, S.S.V. P.G. College, Hapur-245 101, India
    Department of Chemistry, Saraswati Institute of Engineering & Technology, 29, KM Stone, NH-24,
    Pilkhuwa-245 304, India
  • Abstract

    The main aim of this work is to improve the lower detection limit of cadmium selective polymeric membrane. The sensor was fabricated by using thiacalixarene derivative 5,11,17,23-tetra-tert-butyl-25,27-bis-[(3'-methoxy phenyl)methoxy]-26,28-dihydroxy-2,8,14,20-tetrathiacalix [4]arene as ionophore. The membrane with composition of ionophore: PVC: DMP: NaTPB of 3.5% : 33% : 1.0% : 62.5% (w/v) has a standard detection limit of 1.0x10-8 M and lowest possible detection limit of 6.2x10-9 M. The electrode exhibits Nernstian response with slope 35.3±1 mV decade-1 of activity in linear concentration range of 4.2x10-8 to 1.0x10-1 M for Cd2+ ion, performs satisfactorily over wide pH range (1.57.0), with a fast response time (5s). The selectivity coefficients determined by using fixed interference method (FIM) indicate high selectivity for Cd2+ as compared to other tested cations. The practicable utility of electrode has been demonstrated in the titration of Cd2+ with standard EDTA solution. The proposed electrode was successfully used for the determination of Cd2+ in different biological and environmental samples.

    Keywords

    Thiacalix[4]arene, Cadmium, ion-selective electrode, PVC, lower detection limit.

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