#TITLE_ALTERNATIVE#

• Main Author: RODIANI (NIM : 20512050) ; Pembimbing Prof. Dr. Buchari, TENI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/19549
• Institution: Institut Teknologi Bandung

Kit analysis with visual colorimetric method is one of the analysis tools that use is quite easy , fast and cheap . Colorimetry is a method of chemical analysis based on the comparison of the color intensity of the solution with the standard solution color . Analysis kits on the market is the supply from abroad so that it becomes an obstacle to get it and most of these kits are usually not the same volume of each reagent so often one reactant runs out first, but to bring the kit components analysis requires a long time and the price are not cheap . For it was on this study is expected to be made kits for the analysis of phosphate and amonia with easily obtainable materials , stable reagent and relatively depleted in the same time . Appropriate reagent formulations in getting the reagent composition is very important in order to get optimum results with observations of high efficiency . The first stage of this research is to determine the optimization method analysis through spectrophotometric studies , then made the kit and procedure was applied for the analysis of liquid hydroponic fertilizer . The analytical method used was phosphate heteropoly blue method with ammonium molybdate reagent and SnCl2 as reducing agents, Absorbance measurements at a wavelength of 705 nm ,range of linierity are 0.5 – 3.0 ppm. The optimum pH is 0.74 – 1.09 , absorbance measurements done after 10 minutes, absorbance silicate decreased after the addition of 60 ppm as foreign ion, Limit detection is 0.2654 ppm and RSD of repeatability is 3.77 %, the concentration of the standard solution was made as a color comparison is 0.5 to 2.0 ppm then the concentration of hydroponic samples was measured using spectrophotometry 126.273 ppm whereas the results obtained using kits analysis the concentration 125 ppm and recovery is 103,98%. The amonia analytical method used was Nessler method with Nessler reagent and potasium sodium tartrate, Absorbance measurements at a wavelength of 423 nm ,range of linierity are 0.4 – 1.6 ppm. The optimum pH is 12.86 – 13.15 , absorbance measurements done after 30 minutes, absorbance Fe3+ decreased after the addition of 2 ppm as foreign ion, Limit detection is 0.3050 ppm and RSD of repeatability is 3.17 % and recovery is 96.46%. The concentration of the standard solution was made as a color comparison is 0.4 to 1.4 ppm then the concentration of hydroponic samples was measured using spectrophotometry 99.205 ppm whereas the results obtained using kits analysis the concentration 98 ppm