NANO TITANIUM (IV) OXIDE MODIFIED CARBON PASTE ELECTRODE FOR THE ANALYSIS OF BUTYLATED HYDROXYTOLUENE CONCENTRATION IN LOTION BY CYCLIC VOLTAMMETRY

Penelitian ini berfokus pada pembuatan dan pengaplikasian elektroda pasta karbon termodifikasi nano TiO₂ untuk analisis kadar butylated hydroxytoluene pada lotion secara voltametri siklik. Tujuan penelitian ini yaitu menentukan komposisi elektroda pasta karbon termodifikasi nano TiO₂ terbaik, penambahan pH buffer fosfat optimal, penerapan waktu deposisi, dan laju pindai optimal secara voltametri siklik. Larutan BHT 80 ppm digunakan untuk menentukan elektroda dengan kondisi terbaik, sehingga diperoleh voltammogram optimal pada komposisi elektroda 3:5:2 (karbon, nano TiO₂, dan minyak paraffin), buffer fofat pH 8, waktu deposisi 25 detik, dan laju pindai 10 mV. Perolehan kadar BHT sampel A, B, C dengan EPK-TiO₂ secara voltametri siklik sebesar 1874,927, 3848,856, dan 3135,286 ppm, sedangkan konsentrasi sampel dalam HPLC berturut-turut sebesar 1875,12582, 3849,26393, dan 3135,61915 ppm. Diperoleh nilai signifikansi sebesar 0,985 (> 0,05) yang berarti bahwa tidak terdapat perbedaan yang signifikan pada hasil pengukuran konsentrasi BHT pada sampel lotion.

This research focuses on the manufacture and application of nano TiO₂ modified carbon paste electrodes for analysis of butylated hydroxytoluene content in lotions by cyclic voltammetry. The aims of this study were to determine the best nano TiO₂ modified carbon paste electrode composition, optimal addition of phosphate buffer pH, application of deposition time, and optimal scan rate by cyclic voltammetry. 80 ppm BHT solution was used to determine the electrode with the best conditions, so that an optimal voltammogram was obtained at a composition of 3:5:2 electrode (carbon, nano TiO₂, and paraffin oil), phosphate buffer pH 8, deposition time of 25 seconds, and scan rate of 10 mV. Obtaining BHT levels of samples A, B, C with TiO₂ nps-CPE by cyclic voltammetry were 1874.927, 3848.856 and 3135.286 ppm, while the concentration of samples in HPLC were 1875.12582, 3849.26393 and 3135.61915 ppm respectively. A significance value of 0.985 (> 0.05) was obtained, which means that there was no significant difference in the results of measuring the concentration of BHT in the lotion samples.