Kajian Unsur Hara Tanah Asal Desa Gurung Liwut Kabupaten Manggarai Timur Dan Optimasi Analisis Mo(VI) Dari Interferensi Al(III) Dan Fe(III) Secara Spektrofotometri UV-VIS Dengan Pengompleks Alizarin Red S

INAS, Veronika Diana (2019) Kajian Unsur Hara Tanah Asal Desa Gurung Liwut Kabupaten Manggarai Timur Dan Optimasi Analisis Mo(VI) Dari Interferensi Al(III) Dan Fe(III) Secara Spektrofotometri UV-VIS Dengan Pengompleks Alizarin Red S. Undergraduate thesis, Universitas Katolik Widya Mandira.

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Abstract

Research has been carried out on soil mineral sample from Gurung Liwut Village, East Manggarai Regency and Optimization of Analysis of Mo (VI) from Al (III) and Fe (III) Interferences by UV-vis Spectrophotometry with Alizarin Red S Complex. The purpose of this experiment was to determine the composition of the mineral sample and the effect of interference of Al (III) and Fe (III) in the analysis of Mo (VI) metal. This study aims to determine of the nutrient content and the effect of Fe interference on determination Molibdenum metal content in soil sample with Uv-Vis Spectrophotometry method. The steps taken were analysis of soil chemical composition by XRF method, determination of maximum wavelength, optimization of pH, concentration of ARS optimization, interference of Al (III), Fe (III) and Mo(VI) metal analysis in soil samples using UV-Vis spectrophotometry method. The results of the analysis obtained by the chemical composition of soil: Al 16%, Si 33.2%, P 0.52%, K 2.30%, Ca 0.83%, Ti 2.30%, V 0.18%, Cr 0.081 %, Mn 0.16%, Fe 40.15%, Cu 0.16%, and Mo 4.6%. The maximum wavelength for Mo(VI) metal is 515 nm, optimum pH of Mo(VI) 7 and optimum concentration of ARS were 100µg / mL. The presence of Al(III) and Fe(III) in the sample affects the analysis of Mo content whereby the higher the concentration of Al(III) and Fe(III), the higher the absorbance obtained, and the appearance of the solution is also more opaque. The Mo(VI) metal content in the Mo-ARS complex in soil samples were 112500 µg / g (11.25%) and Mo content with XRF 4.6%.

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