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  • Küçük Resim Yok
    Öğe
    A hydrogen ion-selective poly (vinyl chloride mebrane electrode based on calix (4)arene as a perchlorate ion-selective electrode
    (2008) Canel, Esin; Erden, Sevcan; Özel, Demirel Ayça; Memon, Sahahabuddin; Yılmaz, Mustafa; Kılıç, Esma
    A hydrogen ion-selective electrode was prepared using 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetracya-nometoxy-calix[4]arene and the possibility of its use as a perchlorate ion-selective electrode was investigated using its characteristic of becoming perchlorate sensitive in acidic regions. The electrode of the optimum characteristic had a composition of 1% ionophore, 66% o-NPOE, and 33% PVC. This electrode exhibited a linear response over the range 1.0 x 10{-1}-1.0 x 10{-5} M of perchlorate with a slope of 48.7. ± 0.5- mV per p[Cl04]. The effects of the pH and the membrane composition were also investigated. The lifetime of the electrode was at least 4 months and its response time was 10-15 s. The selectivity coefficients of some anions were calculated by the matched potential method.
  • Küçük Resim Yok
    Öğe
    A hydrogen ion-selective poly(vinyl chloride) membrane electrode based on calix[4]arene as a perchlorate ion-selective electrode
    (SCIENTIFIC TECHNICAL RESEARCH COUNCIL TURKEY-TUBITAK, 2008) Canel, Esin; Erden, Sevcan; Özel, Ayça Demirel; Memon, Sahahabuddin; Yılmaz, Mustafa; Kılıç, Esma
    A hydrogen ion-selective electrode was prepared using 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetracyanometoxycalix[4]arene and the possibility of its use as a perchlorate ion-selective electrode was investigated using its characteristic of becoming perchlorate sensitive in acidic regions. The electrode of the optimum characteristic had a composition of 1% ionophore, 66% o-NPOE, and 33% PVC. This electrode exhibited a linear response over the range 1.0 x 10(-1)-1.0 x 10(-5) M of perchlorate with a slope of 48.7 +/- 0.5 mV per p[ClO4]. The effects of the pH and the membrane composition were also investigated. The lifetime of the electrode was at least 4 months and its response time was 10(-15) s. The selectivity coefficients of some anions were calculated by the matched potential method.
  • Küçük Resim
    Öğe
    Hydrogen Lon-Selective Poly(Vinyl Chloride) Membrane Electrode Based on a Calix[4]arene
    (Japan Soc Analytical Chemistry, 2003) Kuruoğlu, Demet; Canel, Esin; Memon, Shahabuddin; Yılmaz, Mustafa; Kılıç, Esma
    A hydrogen ion-selective poly(vinyl chloride) membrane electrode was constructed using 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetracyanomethoxycalix[4]arene as a neutral carrier. The electrode showed an apparent Nernstian response in the 2-11.5 pH range with a slope of 54.0 +/- 0.2 mV/pH at 20 +/- 1degreesC. This electrode showed a rapid response of the emf to changes in the pH, high ion selectivity with respect to lithium, sodium and potassium, and characteristics similar to those reported for the conventional pH glass membrane electrode. It can be used as a potentiometric indicator electrode in hydrofluoric acid solutions. The effects of iodide, thiocyanate, perchlorate and bromide on the characteristics of the electrode were also considered.
  • Küçük Resim
    Öğe
    İyonofor olarak bir kaliks[4]aren türevinin kullanıldığı iyodür-seçici PVC membran elektrot
    (2017) Göver, Tuğçe; Ertürün, H. Elif Kormalı; Özel, Ayça Demirel; Erdemir, Serkan; Canel, Esin
    Bu çalışmada, iyonofor olarak 5,11,17,23-tetra(tert-bütil)-25,26,27,28- tetra(4-propilimidazol asetamit)-kaliks[4]aren bileşiğinin kullanıldığı iyodürseçici yeni bir polivinil klorür (PVC) membran elektrot hazırlandı. İyodür –seçici membranın hazırlanmasında kullanılan PVC, o-nitrofeniloktileter (o-NPOE; plastikleştirici) ve iyonoforun oranı değiştirilerek, optimum membran bileşimi %2 iyonofor, %29,7 PVC, %68,3 o-NPOE olarak bulundu. pH 4,0'de elektrodun doğrusal çalışma aralığının ve eğiminin sırasıyla 1,010-5 – 1,010-2 M ve 52,1 2,6 mV/pI olduğu belirlendi. Önerilen elektrodun oldukça kısa bir cevap süresine (5- 10 s) ve 5 ay’dan daha uzun bir ömre sahip olduğu gözlendi. Elektrot diğer anyonlar varlığında ISalisilat ClO4- NO3- SCN- Benzoat NO2- Br- Cl- F Sitrat HCOO- sırasında bir seçicilik gösterdi. Ayrıca, önerilen elektrot, gümüş nitrat ile iyodürün çöktürme titrasyonunda indikatör elektrot olarak başarılı bir şekilde kullanıldı.