FABRIKASI ELEKTRODA SELEKTIF ION TIMBAL BERBASIS KOPOLIMER METHYL-METHACRYLATE-CO-BUTHYL ACRYLATE (MB28) DENGAN TEKNIK FOTO POLIMER DAN GRAFIT BATANG PENSIL

ARIRI, AHMAD (2021) FABRIKASI ELEKTRODA SELEKTIF ION TIMBAL BERBASIS KOPOLIMER METHYL-METHACRYLATE-CO-BUTHYL ACRYLATE (MB28) DENGAN TEKNIK FOTO POLIMER DAN GRAFIT BATANG PENSIL. S2 thesis, Universitas Mercu Buana Jakarta.

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Abstract

Lead is a dangerous heavy metal that must be periodically controlled for its presence. According to WHO 30 μg/L lead content in the blood can cause serious health problems. several instruments have been used to measure Pb in a sample such as UVVis, ICP-MS, and AAS. These three instruments have a good level of accuracy, but are large in size. For this reason, in this study, a Pb-ISE sensor was fabricated based on a thin copolymer film of methyl-methacrylate-co-butyl acrylate with a ratio of 2:8 (MB28) which was prepared using photopolymer technique and using Polypyrrole-Cl (PGE/PGE) coated pencil graphite electrodes (PPy-Cl) as a transducer and alternative for measuring Pb in the sample using the potentiometric method. MB28 copolymer was synthesized and characterized using FTIR. The formation of the MB28 copolymer can be seen from the loss of peaks in the 1600-1680cm-1 area due to the occurrence of a covalent bond between -C-C- forming the backbone of the MB28 copolymer. In the process of fabricating the Pb-ISE sensor, a membrane composition optimization process has been carried out, where the optimum composition is 1 mg potassium tetrakis (4-chlorophenyl) borate (KTpClPB) and 4.3 mg Lead Ionophore IV (amide group). The Pb-ISE sensor provides good performance by having a Nernstian number of 28.2 ± 0.5 mV/dec in a linear range of 10-3 - 10-10 M and an LOD as low as (6.6 ± 1.6) x 10-11 M. from measurements in the sample solution Pb2NO3 by voltammetric technique using a double junction Ag/AgCl reference electrode. In addition, the Pb-ISE sensor shows a good selectivity coefficient (LogKpota,b) towards K+, Na+,NH4+, Mg2+, Cu2+ and Cd2+ which are -6.6 ± 0.2, -6.1 ± 0.2, -6.7 ± 0.2, - 12.4 ± 0.3, -4.4 ± 0.2 and -6.1 ± 0.1. The fabricated Pb-ISE sensor is effective at working in the pH range of 3-8. The validation process has been carried out by comparing the measurement results of artificial samples at concentrations of 25 and 100 ppm as well as samples of Angke River water, where the results of measurements that have been carried out are comparable to the standard method of measuring UV-Vis spectrophotometers. Keywords : MB28 Copolymer, Photo-polymer, Pb-ISE, Pencil graphite electrode, PPy- Cl Timbal merupakan logam berat berbahaya yang harus dikontrol secara periodik keberadaannya. Menurut WHO 30 μg/L kandungan timbal dalam darah dapat menyebabkan masalah kesehatan serius. beberapa peralatan telah digunakan untuk mengukur logam Pb dalam suatu sampel seperti UV-Vis, ICP-MS, dan AAS.ketiga alat ini memiliki tingkat akurasi yang baik, namun berukuran besar. Untuk itu, pada studi ini dilakukan fabrikasi sensor Pb-ISE berdasarkan kepada kopolimer film tipis methylmethacrylate- co-butyl acrylate dengan rasio 2:8 (MB28) yang dipreparasi menggunakan teknik fotopolimer serta menggunakan elektroda grafit pensil berlapis Polypirol-Cl (PGE/PPy-Cl) sebagai transduser sebagai alternatif pengukuran logam Pb dalam sampel menggunakan metoda poensiometri. Kopolimer MB28 telah disintesis dan dikarakterisasi dengan menggunakan FTIR. Terbentuknya kopolimer MB28 terlihat dari hilangnya puncak pada area 1600-1680cm-1 disebabkan terjadinya simpul ikatan kovalen antara -C-C- membentuk tulang punggung kopolimer MB28. Dalam proses fabrikasi sensor Pb-ISE telah dilakukan proses optimasi komposisi membran, dimana komposisi optimum adalah 1 mg potassium tetrakis(4-chlorophenyl)borate (KTpClPB) dan 4.3 mg Lead Ionophore IV (grup amida). Sensor Pb-ISE memberikan performa yang baik dengan mempunyai bilangan Nernstian sebesar 28.2 ± 0.5 mV/dec pada area linear range 10-3 - 10-10 M serta LOD serendah (6.6 ± 1.6) x 10-11 M. dari pengukuran pada larutan sampel Pb2NO3 dengan teknik voltametri menggunakan elektroda referensi Ag/AgCl jenis double junction. Disamping itu, sensor Pb-ISE memperlihatkan koefisien keselektifan (LogKpot a,b) yang baik terhadap K+, Na+,NH4+, Mg2+, Cu2+ dan Cd2+ yang masing-masing adalah -6.6 ± 0.2, -6.1 ± 0.2,-6.7 ± 0.2, -12.4 ± 0.3, -4.4 ± 0.2 dan -6.1 ± 0.1. Sensor Pb-ISE yang difabrikasi efektif bekerja pada rentang pH 3-8. Proses validasi telah dijalankan dengan membandingkan hasil pengukuran sampel artifisial pada kosentrasi 25 dan 100 ppm serta sampel air kali Angke, dimana hasil pengukuran yang telah dilakukan adalah sebanding dengan metode standar pengukuran spektrofotometer UV-Vis. Kata kunci : MB28 Copolymer, Photo-polymer, Pb-ISE, Pencil graphite electrode, PPy- Cl

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