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Influence of ionic liquid in modified paste carbon electrode to voltametric signals of 2,4,6-trinitrotoluene (TNT) in phosphate buffer solution

Le Thi Vinh Hanh, Nguyen Hoang Anh, Pham Thi Hai Yen, Le Quoc Hung, Nguyen Thanh Tuan, Vu Thi Thu Ha

Abstract


Fabrication of ionic liquid modified paste-carbon-electrodes (ILPCEs) and its application in measuring electrochemical properties of 2,4,6-trinitrotoluene (TNT) were investigated in this study. The modified electrodes were prepared ​​by carbon powder (Cp) with ionic liquid 1-Butyl-3-methylimidazolium tetrafluoroborate [C4mim][BF4] (IL) and paraffin oil (PO) with different percentage of Cp/IL/PO in weight mixing ratios (%w). Voltametric signals of 2,4,6- trinitrotoluene in  phosphate buffer solution 0.05 M with pH = 8 on these modified electrodes was recorded. The modified electrode with ratio Cp/IL/PO equal to 80:10:10 is confirmed to be the best in current signal measurement. In term of TNT electrochemical detection with 0.03-22 ppm concentration range, ILPCEs pointed out advantages over conventional glassy carbon electrode by lower detection limit, better performance in signal collecting, more stable and higher reproducible response.

Keywords: Trinitrotoluene, carbon paste, ionic liquid, modified electrodes, electrochemical sensors.

Keywords


Trinitrotoluene, carbon paste, ionic liquid, modified electrodes, electrochemical sensors