ANALYTICAL PERFORMANCE TEST OF SILVER NANOPARTICLES CITRATE (AgNPs-Cit) IONIC FOR CHROMIUM (III) IONS DETERMINATION

Syafriyanti Annur, NIM.: 15630032 (2019) ANALYTICAL PERFORMANCE TEST OF SILVER NANOPARTICLES CITRATE (AgNPs-Cit) IONIC FOR CHROMIUM (III) IONS DETERMINATION. Skripsi thesis, UIN SUNAN KALIJAGA YOGYAKARTA.

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Abstract

Chromium as heavy metal has potential the risk of air, water, and soil pollution and ultimately to the whole aquatic and terrestrial ecosystem. The objective of this research was synthesize and characterize of silver nanoparticles citrate (AgNPs-Cit) ionic by using sodium borohydride as reducing agent and trisodium citrate as a stabilizer and analyze the material performance of AgNPs-Cit ionic for Cr3+ determination. Material performance test consists of study the effect of pH, specific detection of Cr3+, operational condition of the ratio of AgNPs-Cit:Cr3+, and validation method (linear range, limit of detection (LOD), limit of quantification (LOQ), and repeatability (%RSD)). The method to synthesis of AgNPs-Cit ionic is based on chemical reduction method. Silver nanoparticles used to detect Cr3+ by colorimetric method. In this study, synthesis of AgNPs-Cit ionic has been successfully done and used to detect Cr3+ with an indicator of color change and the absorption of Surface Plasmon Resonance (SPR) bands at specific wavelength which are the characteristic of AgNPs-Cit ionic. The AgNPs-Cit ionic give color change brownish yellow and SPR band at 399.6 nm. The color change from yellow to red also occurs when AgNPs-Cit ionic reacted with Cr3+ and SPR band shift from 392 to 512.5 nm. The material performance test of AgNPs-Cit ionic for Cr3+ determination shows good performance. pH 7 was chosen as the AgNPs-Cit ionic condition after reacting with Cr3+. Specific detection shows that AgNPs-Cit ionic are only selective with Cr3+ and there is no effect from Cr6+. Ratio (v/v) of AgNPs-Cit:Cr3+ 4:1 was chosen as an operational condition because it shows the best sensitivity. Under optimal conditions, the linear range was observed in the ranges concentration 0.8-3.0 ppm with LOD of 0.3 ppm and LOQ of 1.0 ppm. The correlation coefficient (R2) of 0.9611. Repeatability shows a good precision (<5%) in 3.4% for 1.2 ppm and 1.6% for 1.6 ppm. This development method was successfully carried out with good performance so as to pave the way for further application in the real sample.

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