Construction and Characterization of Indium Liquid Ion Selective Electrodes Based on Crown Ethers in a PVC Matrix Membrane

Najwa I. ABDULLA; Abdul-Muhsin Al--HAIDER

Makale detayları

Construction and Characterization of Indium Liquid Ion Selective Electrodes Based on Crown Ethers in a PVC Matrix Membrane

Yazarlar:

Najwa I. ABDULLA | Abdul-Muhsin Al--HAIDER

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2005 Vol.29 Issue 6, pp.687-696

Belge Tipi:

Makale

Yayın Tarihi:

5/2005

Belge Dili:

Türkçe

Document ID (Org No.):

2000729016

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

Özet:

 

Several indium ion selective electrodes were constructed  based on 15-crown-5 (15C5), dicyclohexano-18-crown-6 (DCH18C6) and  dibenzo-24-crown-8 (DB24C8) as sensors and di-octyl phenyl phosphonate  (DOPP), di-butyl phthalate (DBPH), tri-butyl phosphate (DBP),  tri-n-amyl phosphate (TAP) and bis (2-ethyl hexyl) phosphate (BEHP) as  plasticizers in a PVC matrix membrane.  Electrode parameters, pH  effect and interferences were also studied.  The indium electrode based on 15C5 using DOPP as a plasticizer gave  the best response for low levels of In3+ ions.  The linear range  for this electrode ranged from 3.8 x 10-5 to 5.0 x 10-2 M (with  correlation coefficient r = 0.9997), the slope was 20.1 mV/decade with  a detection limit of 1.2 x 10-5 M, and the working pH range was  3.8--5.9.  Interferences of Na+ , K+ , NH4+ , Ca2+ , Ba2+ , Cd2+ ,  La3+ , Nd3+ and Eu3+ on the electrode response were also  investigated using a mixed solution method.  Mono- and divalent  cations were found to interfere less than trivalent cations.  The concentrations of indium ions in the prepared standard solutions  were determined by direct, standard addition (SA), multiple standard  addition (MSA) and titration methods.  The results were compared with  those obtained by atomic absorption spectrophotometry.  The precision  and accuracy of each method were calculated and expressed in terms of  the relative standard deviation and the relative error.  Optical measurements were also studied by measuring the absorbance for  each membrane after steady intervals of immersion in a standard  solution of its ions using UV/Visible spectrophotometry.  Each  membrane showed a rapid decrease in absorbance when it reached the end  of its life due to leaching of the membrane contents to the external  solution.

 

Several indium ion selective electrodes were constructed  based on 15-crown-5 (15C5), dicyclohexano-18-crown-6 (DCH18C6) and  dibenzo-24-crown-8 (DB24C8) as sensors and di-octyl phenyl phosphonate  (DOPP), di-butyl phthalate (DBPH), tri-butyl phosphate (DBP),  tri-n-amyl phosphate (TAP) and bis (2-ethyl hexyl) phosphate (BEHP) as  plasticizers in a PVC matrix membrane.  Electrode parameters, pH  effect and interferences were also studied.  The indium electrode based on 15C5 using DOPP as a plasticizer gave  the best response for low levels of In3+ ions.  The linear range  for this electrode ranged from 3.8 x 10-5 to 5.0 x 10-2 M (with  correlation coefficient r = 0.9997), the slope was 20.1 mV/decade with  a detection limit of 1.2 x 10-5 M, and the working pH range was  3.8--5.9.  Interferences of Na+ , K+ , NH4+ , Ca2+ , Ba2+ , Cd2+ ,  La3+ , Nd3+ and Eu3+ on the electrode response were also  investigated using a mixed solution method.  Mono- and divalent  cations were found to interfere less than trivalent cations.  The concentrations of indium ions in the prepared standard solutions  were determined by direct, standard addition (SA), multiple standard  addition (MSA) and titration methods.  The results were compared with  those obtained by atomic absorption spectrophotometry.  The precision  and accuracy of each method were calculated and expressed in terms of  the relative standard deviation and the relative error.  Optical measurements were also studied by measuring the absorbance for  each membrane after steady intervals of immersion in a standard  solution of its ions using UV/Visible spectrophotometry.  Each  membrane showed a rapid decrease in absorbance when it reached the end  of its life due to leaching of the membrane contents to the external  solution.

Makale detayları

Construction and Characterization of Indium Liquid Ion Selective Electrodes Based on Crown Ethers in a PVC Matrix Membrane

Yazarlar: Najwa I. ABDULLA | Abdul-Muhsin Al--HAIDER

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 2005 Vol.29 Issue 6, pp.687-696

Belge Tipi: Makale

Yayın Tarihi: 5/2005

Belge Dili: Türkçe

Document ID (Org No.): 2000729016

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

Sayı

Yazarlar:

Najwa I. ABDULLA | Abdul-Muhsin Al--HAIDER

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2005 Vol.29 Issue 6, pp.687-696

Belge Tipi:

Makale

Yayın Tarihi:

5/2005

Belge Dili:

Türkçe

Document ID (Org No.):

2000729016

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527