Papers by Keyword: EDTA

Abstract: Plants need two types of nutrients, which are macronutrients and micronutrients. Micronutrient needed by plants in small concentration (≤ 100 ppm) i.e. Cu and Zn. This study aims to determine the best composition ratio of Cu:EDTA, Zn:EDTA, and Cu:Zn:EDTA for making the micronutrients, determine the effect of Cu and Zn on lettuce (Lactuca sativa L), and determine the most effective type of micronutrient fertilizer and its concentration for lettuce growth. It was started by dissolving materials with 200 ml distilled water, then stirred and heated at 70-80°C for two hours. After that, the solution was precipitated for two days at room temperature. Methanol was added only before precipitating CuZn-EDTA. The precipitate or micronutrient crystals of Cu-EDTA, Zn-EDTA, and CuZn-EDTA were then filtered and dried in a desiccator for three days. Each of micronutrient crystal was dissolved into 25 ml water then the lettuce will be sprayed with micronutrient solution for two and three sprays once a week. Observations related to the quantity of leaves, plant length, and leaf width were carried out for 25 days and then plant harvested and weighed. The result shows that the best compotition ratio for making micronutrients were Cu:EDTA (1:1.85)w/w; Zn:EDTA (1:3.43)w/w; and Cu:Zn:EDTA (1:1.6:3.85)w/w/w. Concentration of micronutrient solution applied were 5000 and 1000 ppm. Respectively for each concentration, micronutrient CuZn-EDTA affected the leaves quantity growth with the slope of 0.0655 and 0.0642; and yields (g/cm2) with the slope of 0.495 and 0.46. Zn-EDTA had an effect on plant length growth with a slope of 0.1525 and 0.091; and leaf width growth with a slope of 0.0216 and 0.0111. Cu and Zn contained in lettuce leaves then analyzed and was known for Cu-EDTA, Cu and Zn contained (mg/kg) respectively were 37.78 and 50.68; for Zn-EDTA were 32.8 and 61.25; for CuZn-EDTA were 33.23 and 48.16 (mg/kg). The metal content analyzed in lettuce leaves is not suitable for consumption because it exceeds the maximum limit written on the Decree of the Directorate General of POM No 03725/B/SK/VII/89. Application of fertilizer should be more diluted to less than the maximum limit.

Abstract: Fenton process involving Fe²⁺ ions and H₂O₂ produces OH radicals, that act as a strong oxidizing agent for degradation of a variety of organic pollutants. However the process is poor performance at neutral pH limiting its application for industrial wastewater treatment. The short coming problem, in the current study, is solved by introducing ethylene diamine tetra acetic acid (EDTA) as a complexing compound. The degradation was conducted through batch experiment, by varying EDTA concentration and pH. In addition, the Fe²⁺ and H₂O₂ concentrations, and the reaction time were optimized. The research results assign that the addition of EDTA could remarkably enhance the degradation of anionic surfactant, that was 96% at pH 6-8. The increase of the degradation was proportional to the concentrations of EDTA and 6 mg/L showed the optimum level. The highest degradation of 162 mg/L anionic surfactant in 20 mL of the laundry wastewater could be achieved within 30 mins by using Fe²⁺ 10 mM, H₂O₂ 50 mM, and in the pre12sence of EDTA 6 mg/L at pH 7. Key words : Fenton, EDTA, degradation, surfactant, wastewater

Abstract: The use of chemical pretreatment with 10mM EDTA to enhance the arsenic microbial mobilization was evaluated in this study. The bioleaching involved the use of the indigenous sedimentary and soil heterotrophic microorganisms, whose leaching media contained 2mM EDTA. The main objectives of using the chemical pretreatment was the removal of metal surface coatings from the iron minerals, such as Cu and Zn, which inhibited the iron microbial dissolution in the soil and sediment environment and thus increasing the mobilization of the retained As. To examine the effect of the chemical pretreatment and the biological leaching on the mobilization of Cu, Zn, and As, batch and column tests were conducted within the laboratory experiments. The removal of As and Zn from the soil and sediment was greatly enhanced by the co-treatment in the batch solution conditions than in the column percolate conditions and had negative effect only for Cu. In the batch tests, the heterotrophic bioleaching of the soil and sediment was found to have a pronounced positive effect on the extraction of As and Zn.

Abstract: Na (Y_1.5Na_0.5)F₆ microparticks were prepared by hydrothermal method. EDTA as the chelating agent. The samples were characterized by X-ray diffraction, scanning electron microscopy and fluorescence spectrometer. The X-ray diffraction indicates that the crystal shows a hexagon phase structure. Under the excitation of 980nm laser, the Na (Y_1.5Na_0.5)F₆ exhibited strong up-conversion light: ⁴F_9/2→⁴I_15/2(red), ⁴H_11/2/⁴S_3/2→⁴I_15/2(green) and ⁴G_11/2→²H_9/2 (near-ultraviolet).

Abstract: The presented paper discusses a possibility of developing and modifying surface of nickel substrate by applying of Ni, Pt, Pt/Ni porous metallic layers by zol-gel method using EDTA as a complexing agent. Then gel containing Pt or Ni or Ni/Pt was decomposed during pyrolysis process and then transformed into the porous metal during oxidation/reduction process at 600°C respectively in air or H₂ atmosphere. The thermal decomposition of gels were studied by TG/DTA method. Compositions of oxidized as well as metallic layers were determined by EDX and XRD method. The morphology of Pt, Ni and Pt/Ni layers were studied by SEM method.

Abstract: This study investigated the effect of ultraviolet (UV) enhancement and the Fe³⁺-EDTA Complex on the degradation of methylene blue (MB) in Fenton-like system. By studying different variables including H₂O₂ concentration, Fe³⁺-EDTA concentration and pH value，and using MB as a model pollutant, the best experimental conditions was to investigated. Experimental results showed that it is possible to degrade MB wastewater effectively by modified UV-Fenton with Fe³⁺-EDTA at neutral pH. Besides, optimality condition (pH= 7, [Fe³⁺-EDTA] = 2 mmol/L, [H₂O₂] = 10 mmol/L) which were used in the modified UV-Fenton that achieves a removal of over 95% of the MB in 60 min reaction time. Therefore, this new modified Fenton system is an effective treatment for MB wastewater.

Abstract: A large amount of blast furnace slag, a by-product of the iron-making process, is generated annually. We attempted to convert blast furnace slag (BFS) into zeolitic materials using alkali fusion with ethylenediamine tetraacetate dihydrate (EDTA) chelation. Without addition of EDTA, a mixture of hydroxysodalite and calcite was synthesized. With EDTA addition, Ca²⁺ ions were trapped by chelation in solution during agitation, then the chelation was promoted by heating at synthesis, and zeolite-A, zeolite-X and hydroxysodalite were synthesized.

Abstract: Radiosynovectomy is an innovative medical treatment for rheumatoid arthritis joints. A small amount of beta-emitting radiopharmaceutical is injected into the joint with intra-articullar route of administration. An ideal radionuclide for this treatment is beta emitter whose minimal gamma ray emission, tissue penetration between 5 10 mm, has short half life, high chemical purity and non-toxic properties such as Rhenium-188. For delivering the radionuclide to the specific target site in the synovial tissue and preventing the leakage to the lymph, an ideal carrier as particulate or colloidal compounds is requaired. A silica-based nanomaterial called M41S-NH₂ was developed as therapeutic carriers by Polytechnic Institute of Nuclear Technology, Yogyakarta. The advantage of M41S-NH₂ is biocompatible and not toxic to human body. As a preliminary experiment, M41S-NH₂ was labeled using Technetium-99m which has a similar chemical properties with Rhenium-188. The radiolabelling performed in this system is the indirect method. The purpose of this research is to obtain the highest radiochemical purity of radiolabeled ^99mTc-M41S-NH₂ by using two co-ligands such as ethylenediaminetetraasetic acid (EDTA) and sodium pyophosphate (PYP). Some parameter such as pH, ratio of SnCl₂ to co-ligand, ammount of reductor agent, ammount of M41S-NH₂ were optimized in those experiments. Radiochemical purity determination was conducted by ascending paper chromatography method using Whatman 31-ET as stationary phase and physiological saline (NaCl 0,9%) as mobile phase. The optimum condition obtained from the investigation were by using 10 μg PYP as co-ligand, 10 μg SnCl₂ as reductor agent, pH 9, and 10 minutes in room temperature as incubation time. More over the highest radiochemical purity obtained from those labeling experiments is 93.42± 0.06 %.

Abstract: In order to minimum high environmental persistence while enhancing the effects of phytoextract heavy metals in plant, though applied different ratio of non-biological chelating agent EDTA and biological chelating agent EDDS application phytoremediation into the Rape (Brassica campestris L), monocots corn (Zea mays L). This experiment was conducted with a simulation in Pb, Cu, Cd complex artificially contaminated soil. The results show that appling chelator EDTA-EDDS application on the corn and the rape were play important promoting role in the metal of soil, and were more than the effects of the accumulation of the single EDTA or single EDDS. The concentrations of mobile metals Pb, Cu in soil were the highest of 386.5 mg·kg^-1, 1369 mg·kg^-1, adding treatment 2 (EDTA / EDDS = 2:1), respectively the control group. The concentrations of mobile metals Cd in soil were the highest of 89.6 mg·kg^-1, adding treatment 3 (EDTA / EDDS = 1:1), respectively the control group.

Abstract: Oxidative degradation of ethylenediaminetetraacetic acid (EDTA) in aqueous solution at room temperature and pressure by the bimetallic Al-Fe/O₂ process, which was verified by the addition of benzoic acid as ·OH scavenger and the detection of para-hydroxybenzoic acid, was investigated. The results showed that the removal efficiency of EDTA, TOC and TN could be about 98%, 77.5% and 43% respectively after 3h reaction when the initial pH was 5. The effects of initial pH, concentration of EDTA, mass ratio of Al⁰ and Fe⁰ and Al-Fe loading were also investigated. Significantly, the bimetallic Al-Fe process exhibited higher reactivity than monometallic Fe⁰/Al⁰ process for the degradation of EDTA when the mass ratio of Al⁰ and Fe⁰ ranged from 0.11 to 2.97.