Malaysian Journal of Analytical Sciences Vol 21 No 1 (2017): 1 - 12

DOI: http://dx.doi.org/10.17576/mjas-2017-2101-01

 

 

 

A SCREEN-PRINTED COPPER ION SENSOR WITH PHOTOCURABLE POLY(N-BUTYL ACRYLATE) MEMBRANE BASED ON IONOPHORE

O-XYLYLENE BIS(N,N-DIISOBUTYLDITHIOCARBAMATE)

 

(Sensor Ion Kuprum Bercetak Skrin Berasaskan Ionofor O-Xililen Bis(N,N-Diisobutil-ditiokarbamat) Dalam Membran Terawatfoto Poli(n-butil akrilat))

 

Kook Shih Ying and Lee Yook Heng*

 

School of Chemical Sciences and Food Technology, Faculty of Science and Technology,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

 

*Corresponding author: leeyookheng@yahoo.co.uk

 

 

Received: 6 September 2016; Accepted: 22 November 2016

 

 

Abstract

A screen-printed copper ion sensor with photocurable poly(n-butyl acrylate) (pBA) membrane based on ionophore o-xylylene bis(N,N-diisobutyldithiocarbamate) (o-xc) was successfully fabricated. Poly(2-hydroxylethyl methacrylate) (pHEMA)-modified Ag/AgCl screen-printed electrode was used in the development of the sensor and the sensor was characterized by potentiometric method. Optimization of pBA membrane for the electrode was carried out by varying the compositions of sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (NaTFPB) and o-xc to determine the best analytical performance. The addition of NaTFPB and the increment of its ratio relative to o-xc showed super-Nernstian, small linear range, and high detection limit. For sensor fabricated based on o-xc without the addition of NaTFPB, the sensor showed Nernstian response. The best optimized sensor showed Nernstian slope with 31.29 mV/decade over a wide linear range of 1.0 × 10^-2 – 1.0 × 10^-6 M and low detection limit of 1.89 × 10^-7 M. The sensitivity of this sensor was also improved over the other copper ion sensors fabricated by similar photocuring technique. In addition, based on the separate solution method (SSM), this sensor exhibited good selectivity towards copper ion with low logarithm selectivity coefficient value for monovalent and divalent cations namely K⁺, Na⁺, Ca²⁺, Mg²⁺, Ni²⁺ and Co²⁺.

 

Keywords:  screen-printed copper ion sensor, photocurable poly(n-butyl acrylate) membrane, ionophore o-xylylene bis(N,N-diisobutyldithiocarbamate), potentiometry

 

Abstrak

Sensor ion kuprum bercetak skrin yang berasaskan kepada ionofor o-xililen bis(N,N-diisobutilditiokarbamat) (o-xc) dalam membran terawatfoto poli(butil-akrilat) (pBA) telah dibangunkan. Sensor ion elektrod bercetak skrin Ag/AgCl terubahsuai poli(2-hidroksiletil metakrilat) (pHEMA) telah digunakan dalam pembangunan sensor dan pencirian sensor telah dijalankan melalui kaedah potensiometri. Pengoptimunan komposisi membran sensor ion pada elektrod telah dijalankan untuk menentukan prestasi analisis yang terbaik dengan mengubah komposisi sodium tetrakis[3,5-bis(trifluorometil)fenil]borat (NaTFPB) dan o-xc. Penambahan NaTFPB dan peningkatan nisbahnya terhadap o-xc dalam membran menunjukkan super-Nernstian, julat linear yang pendek dan had pengesanan yang tinggi. Sensor ion yang direka bentuk dengan menggunakan o-xc tanpa penambahan NaTFPB menunjukkan rangsangan Nernstian. Sensor ion yang terbaik menunjukkan kecerunan Nernstian iaitu 31.29mV/dekad, julat linear dari 1.0 × 10^-2 – 1.0 × 10^-6 M dan had pengesanan terendah 1.89 × 10^-7 M. Kepekaan sensor yang telah dibangunkan juga adalah lebih baik berbanding dengan sensor-sensor ion kuprum lain yang telah direka bentuk melalui kaedah rawatan foto yang sama. Nilai pekali keselektifan potensiometri ditentukan dengan kaedah larutan berasingan (SSM). Sensor tersebut juga memberikan keselektifan yang baik terhadap kation pengganggu dengan menunjukkan nilai pekali logaritma keselektifan yang rendah bagi kation monovalen dan divalen seperti K⁺, Na⁺,Ca²⁺, Mg²⁺, Ni²⁺ dan Co²⁺.

 

Kata kunci:    sensor ion kuprum bercetak skrin, membran terawatfoto poli(n-butil akrilat), ionofor o-xililen bis(N,N-diisobutilditiokarbamat); potensiometri

 

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