DEVELOPMENT OF OPTICAL SENSORS FOR ANALYSIS OF METAL ION Cd (II)

• Main Author: Ayu Bethari, Sylvia
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/34854
• Institution: Institut Teknologi Bandung

The global water problem can be caused by the contamination of human activities. Industrial waste water can contain metals ion such as Cd(II) ion that are harmfull to human and its difficult to degrade by microorganism. This metal ion will accumulate in the environmet. In this study, analysis of Cd(II) metal ion using optical sensor was developed and evaluated. For this purpose thin layer/film of Tetraethyl orthosilicate (TEOS) using a ligand 4-(2- Pyridylazo)resorcinol monosodium salt monohydrate (PAR) was developed. Cd(II) metals ion reacts with PAR to form colored complex compounds. Cetyltrimethylammonium bromide (CTAB) was added in preparation of thin layer as a template. Thin layer which was originally yellow turned to orange with the maximum wavelength of 494 nm after react with Cd(II) metal ion. The method was used as the basis of quantitative analysis because of the color changes that occur due to the presence of Cd(II) was proportional to the concentration. By using river water, the sampel measurements result percent of recovery was 88 – 103.44 % and sensitivity value of 0.20 ppm/unit of absorbance with Cd(II) concentration was 1.86 – 2.70 ppm. The addition of nitric acid can release the Cd(II) ion, so the sensor can be reusable in order to minimize the use of reagents and to improve analysis of Cd(II) metal ion in the environment.