Analysis Methods Verification of Boron in River Water Using the Uv-Vis Spectrophotometer with Curcumin Complex as Alternative Practical Educations

Boron is one of the industrial wastes included in the hazardous and toxic materials category. The purpose of this study was to determine river water sample levels and determine the value of linearity, RSD, and% recovery. The method used is under APHA - AWWA 4500 B. Some boron complexing compounds include curcumin in acetic acid, carminic acid, and quinalizarin, but in this study, curcumin complex are used because their sources in Indonesia are abundant. Curcumin gives a red complex color as an indication of the presence of boron in the sample. This phenomenon makes the learning process through practicum very interesting. Students can see the color change directly from orange to red. Students taught to produce reliable data and understand the importance of the chemist and analyst profession for the community through the practice of verification and validation methods, and the determination of the value of boron. Based on this study, it concluded that the Boron content in river water samples is 0.4766 mg / L. These results obtained from the straight-line equation that is y = 0.3446x - 0.0119 with R2 of 0.9976. The results of the RSD analysis are 0.028%, which states that the value is in the Horwitz TABLE range. Therefore, it can be accepted. Besides, the% Recovery is 86%; this value meets the analysis standard and is acceptable because it is in the range of 85% -115%. Finally, the measured boron levels in river water samples are still below the quality standard limits of the Republic of Indonesia Government Regulation Number 82 of 2001 concerning water quality treatment and water pollution control with a value of boron levels less than 1 mg / L. The boron content in a sample of river water in the Semarang area is still safe

Green Chemistry: Effect of Microwave Irradiationon Synthesis of Chitosan for Biomedical Grade Applications of Biodegradable Materials

Microwave assisted chitosan synthesis as biodegradable material for biomedical application has been done. The purpose of this research is to synthesis of chitosan with high DD and low molecular weight using microwave energy, the study of reaction conditions include parameters of power and reaction time. Chitosan was prepared by deacetylation of chitin with 60% NaOH solution. Conventional method has been done by reflux for 90minutes, resulting chitosan with DD of 79.5%, 72.6% yields and molecular weight 6051 g/mol. Green chemistry method using microwave radiation at 800 Watts for 5 minutes has produced chitosan with highest DD, yield and molecular weight of 86%, 75% and 3797 g/mole respectively. Synthesis of Chitosan by microwave radiation method can save 10x electrical energy for the reaction, also rapidly and effectively to produce chitosan with low molecular weight compared to conventional method

Adsorption Study of Methylene Blue and Methyl Orange Using Green Shell (Perna Viridis)

Green shell is generally disposed of and become environmental contaminants. In this study, the green shell was used as material to adsorb dyes residue: methylene blue and methyl oranges. Green shell waste from seafood was prepared by removing the dirt then dried at room temperature. It was followed by roughly crushing before being placed in the furnace at temperatures of 300, 500, 700 and 900 °C. The selected adsorbents were sieved at 200 mesh. The adsorbents were characterized by FTIR and SEM-EDX to evaluate their functional groups and morphology. Furthermore, the adsorption process was evaluated by determining the kinetic adsorption models. The results of the FTIR characterization showed the vibration of Ca(OH)2 bone at a wave number of 3400 cm-1 and morphological analysis by SEM showed a homogeneous surface. Adsorption kinetics results obtained from the variation of time with the initial adsorbate concentration showed the kinetic model of both methylene blue and methyl orange adsorption onto the adsorbent followed a pseudo-second order