Sains Malaysiana 47(11)(2018): 2657–2666

http://dx.doi.org/10.17576/jsm-2018-4711-08

 

A New Copper Ionophore N1, N3-Bis [[3,5-Bis(Trifluoromethyl)Phenyl] Carbamothioyl] Isophtalamide for Potentiometric Sensor

(Ionofor Kuprum Baru N1,N3-Bis [[3,5-Bis(Trifluorometil)Fenil]-Karbamotioil] Isoftalamida sebagai Sensor Potensiometri)

 

KOOK SHIH YING, LEE YOOK HENG^*, NURUL IZZATY HASSAN & SITI AISHAH HASBULLAH

 

School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

Received: 28 February 2018/Accepted: 6 July 2018

 

ABSTRACT

A copper ion sensor based on a new bis-thiourea compound N1,N3-bis[[3,5-bis(trifluoromethyl)phenyl]carbamothioyl]isophthalamide (or TPC) as neutral carrier was investigated. The immobilization of the TPC into poly(n-butyl acrylate) (pBA) membrane via drop casting and the sensor was characterized by potentiometry. The sensor fabricated from TPC only showed a good Nernstian response towards copper ion with a sensitivity slope of 28.81±0.53mV/decade in the range of 1.0 × 10-6 - 1.0 × 10-4 M. The limit of detection of this sensor was found to be 6.11 × 10-7 M and with short sensor response time (60 - 80 s). This sensor also demonstrated reversibility and reproducibility with 3.69% and 1.84% (Relative Standard Deviation, RSD), respectively. Based on the separate solution method (SSM), the logarithm selectivity coefficients were better than -2.00 for monovalent, divalent and trivalent cations and this confirmed that the sensor exhibited good selectivity towards copper ion. The sensor could attain optimum function without the need in the inclusion of either lipophilic anions as a membrane additive nor plasticizer as a membrane softener. Thus, these are the main advantages. The addition of lipophilic anions into the pBA membrane could cause the sensitivity and selectivity of the copper ion sensor based on ionophore TPC to deteriorate.

 

Keywords: Anionic lipophilic salt; neutral carrier; N1,N3-bis[[3,5-bis(trifluoromethyl)phenyl]carbamothioyl]isophthalamide (TPC); potentiometric copper ion sensor

 

ABSTRAK

Sensor ion kuprum yang berasaskan kepada sebatian bis-tiourea baru, N1,N3-bis[[3,5-bis(trifluorometil)fenil]karbamotioil]isoftalamida (TPC) sebagai pembawa neutral telah dikaji. Pencirian sensor dijalankan melalui kaedah potensiometri dan TPC dipegunkan ke dalam membran poli(n-butil akrilat) (pBA) secara penyalutan. Sensor ion yang direka bentuk dengan menggunakan TPC sahaja menunjukkan rangsangan Nernstian, iaitu 28.81±0.53mV/dekad dengan julat kelinearan daripada 1.0 × 10-6 – 1.0 × 10-4 M. Had pengesanan adalah serendah 6.11 × 10-7 M dan masa rangsangan ialah 60 hingga 80 saat. Nilai sisihan piawai relatif bagi ujian kebolehbalikan dan kebolehhasilan sensor ini masing-masing ialah 3.69% dan 1.84%. Berdasarkan kepada kaedah larutan berasingan (SSM), nilai pekali logaritma kepilihan bagi sensor ini adalah lebih baik daripada -2.00 bagi kation monovalen, divalen dan trivalen seterusnya memaparkan kepilihan yang baik terhadap ion kuprum. Kebaikan sensor ini adalah bahan penambahan membran seperti anion lipofilik dan pelembut membran seperti pemplastik tidak diperlukan untuk mencapai fungsi sensor yang optimum. Sebaliknya, penambahan anion lipofilik dalam membran pBA boleh menjejaskan kepekaan dan kepilihan sensor ion kuprum berasaskan ionofor TPC.

 

Kata kunci: Garam anion lipofilik; kuprum ion sensor potensiometri; N1,N3-bis[[3,5bis(trifluorometil)fenil]karbamotioil]isoftalamida (TPC); pembawa neutral

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*Corresponding author; email: leeyookheng@yahoo.co.uk