VOLTAMMETRIC DETERMINATION OF RHODAMINE B USING CARBON PASTE ELECTRODE MODIFIED TIO2
Colorants are present in various types of foods found in the market. Several dangerous dyes are not intended to be used as food additives. These prohibited dyes have been listed in the Regulation of the Minister of Health of the Republic of Indonesia Number 239/MenKes/Per/V/1985, one of which...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/75542 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Colorants are present in various types of foods found in the market. Several dangerous dyes
are not intended to be used as food additives. These prohibited dyes have been listed in the
Regulation of the Minister of Health of the Republic of Indonesia Number
239/MenKes/Per/V/1985, one of which is rhodamine B. Rhodamine B is generally used in the
textile, cosmetic, and paper industries because it has advantages such as its attractive color.
However, there are still foods containing rhodamine B in the market. The accumulation of
rhodamine B in the body is dangerous because it is carcinogenic, and causes enlargement of
the liver and kidneys, as well as physiological disorders of the body. Therefore, a highly
sensitive method for rhodamine B analysis is required. In this study, a voltammetric analysis
method was developed using a modified TiO2 carbon paste electrode (EPK) for the detection
of rhodamine B. TiO2 was chosen because it is stable against oxidation reactions and can
expand the surface area of the electrode. The results showed that EPK-TiO2 had a better
sensitivity for measuring rhodamine B than EPK. In optimizing the manufacturing of
electrodes, EPK with a composition of 8% yielded the best results. The optimum conditions
for measurement were obtained using cyclic voltammetry technique in 0.1 M phosphate buffer
pH 9. The repeated test of one electrode 20 times showed a %RSD of 2.37%, and the
reproducibility of the three electrodes showed a %RSD of 1.06%, which indicated EPK- TiO2
had good performance. EPK-TiO2 has a linear range of 1-1,000 µM with a detection limit of
2.18 µM. Scanning rate analysis showed that the process on the surface of the electrode was
controlled by the diffusion process. This electrode provided results that were not significantly
different from the sample measurements using a UV-Vis spectrophotometer |
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