Garuda - Garba Rujukan Digital

Siti Jazimah Iswarin

Brawijaya University

Author-ID : 2844167

Environmental Science

Published : 3 Documents Claim Missing Document

Claim Missing Document

Articles

Method of Reducing Air Pollution from Motor Vehicles Unggul Punjung Juswono; Siti Jazimah Iswarin; Achmad F.D Romly; Rurini Retnowati
Natural B, Journal of Health and Environmental Sciences Vol 1, No 2 (2011)
Publisher : Natural B, Journal of Health and Environmental Sciences

Increasing of air pollutions which are occurred in Indonesia is running together with the increase of motor vehicle populations. The old motor vehicles contribute to the increase of air pollution significantly due to the imperfectly burning process in their machine. Air pollution is seriously threat human being not only disturb human health but also cause greenhouse effect and global warming. It needs do some research to decrease air pollution caused by motor vehicle to get a better environment. The research has been done by filtration of disposal gas from motor vehicles using water, lubricant and carbonic acid as a filter. The disposal gas from a motor vehicle was flowed throw bottles contain of water, lubricant and carbonic acid. The result showed that water filter can decrease the disposal gas CO and CO2. Oil filter significantly decreased HC gas and carbonic acid filter could be used to decrease Pb.

Study of Adsorption and Desorption on Gold Metals by Biomass Saccharomyces cerevisiae. Thermodynamic Review Masruroh Masruroh; Lailatin Nuriyah; Siti Jazimah Iswarin; Eka Rahmawati
Natural B, Journal of Health and Environmental Sciences Vol 1, No 2 (2011)
Publisher : Natural B, Journal of Health and Environmental Sciences

A Study on biosorption of gold solution (Au) by Saccharomyces cerevisiae has been caried out. These studies included determination of optimum pH, optimum Au solution concentration, isotherm and biosorption capacity based on termodinamycs theory, and mechanims of interaction between Au ion and Saccharomyces cerevisiae biosorben. Mechanisms of interaction were known with Au ion on Saccharomyces cerevisiae biosorben using aquadest and 1 M HCl. The result showed that the optimum adsorption process of Au solution by Saccharomyces cerevisiae biosorben took place on pH 5, adsorbat concetration of 100 mg/L was 2.2321 mg/g of yeast. The adsorption isoterm followed the Langmuir adsorption with regresion value of 0.8550 (R2= 0.8550), that indicates that the chemisorption process occurred on the first monolayer on the adsorbent surface. From the thermodynamics theory gives Gibbs free energy of the process a value of ΔG = -0.09195 kJ/mol and showing spontaneous physisorption process. The number of Au ion desorption by using HCL was 73.98%, whereas by using aquades it was 35.42%. It indicated that the main interaction between Saccharomyces cerevisiae biosorben and Au ion was chemisorption.

Potential Changes of Water Spinach (Ipomoea aquatica Forsk) Root’s Cell Membrane as an Indicator of Environmental Pollution of Waste Water Siti Jazimah Iswarin
Natural B, Journal of Health and Environmental Sciences Vol 1, No 1 (2011)
Publisher : Natural B, Journal of Health and Environmental Sciences

This research is to study the potential change of water spinach root cell membrane using various concentration of Pb ions in 20, 40, 60, 80, and 100ppm using water which come from irrigating rice field at three locations. Pb ions in water and water spinach are specified by Atom Spectrophotometer Spectrophotometer. The membrane potential change is regression determined. From the graph it is shown that the percentage change in membrane potential increases by Pb concentration. At the edge of the rice field, potential of water changes about (18±2) %, at 25 m from the edge, potential changes about (6±4) %, at 50 m from the edge, potential changes about (38±12) %. From this data, Pb2+ is 35.8 ppm (first location), 0 ppm (second location), and 135.3 ppm (third location). Pb2+ concentration calculated using AAS are 0.045 ppm (first location), 0.010 ppm (second location), and 0.025 (third location). In water spinach there are: Pb2 + / ppm; 3.0; 0.9; 5.6. The membrane potential is affected by the ion solution. The higher the pollution, the higher the membrane potential will be. Increasing the type of substance also increases the membrane potential changes that are sensitive to Pb ions. Based on this case the potential change of cell membrane of root of water spinach can be used as an indicator of pollution.

Title

Found 3 Documents
Search

Abstract

Abstract

Abstract

Title Search

Found 3 Documents Search

Abstract

Abstract

Abstract

Title

Found 3 Documents
Search