ANALISIS Fe3+ SECARA KOLORIMETRI DENGAN MENGGUNAKAN NANOPARTIKEL PERAK SEBAGAI AGEN SENSOR; COLORIMETRIC ANALYSIS OF Fe3+ BY USING SILVER NANOPARTICLES AS SENSOR AGENT

Marcelina, Roto

2014 | Disertasi | PROGRAM STUDI S2 ILMU KIMIA

Ferric ion is very important in the biological systems. A sensitive detection of this ion in biological serum is always of interests. A colorimetric sensing of ferric ion assisted by Ag nanoparticles has been devised. A linear decrease in the absorbance of the 5 ppm colloidal Ag nanoparticles was observed with increase in ferric ion concentration. When o-phenanthroline was added to the mixture, the solution color changed from yellow to red, indicating that reduction of ferric ion occurred. The decrease in absorbance is believed due to the decrease in localized surface plasmon resonance (LSPR) of the colloidal Ag nanoparticles. The limit of detection of ferric ion analysis using this colorimetric method is about 10 ppb, much lower than that of any other available methods

Kata Kunci : Ag nanoparticles, localized surface plasmon resonance, a colometric sensing of ferric ion