Search Results

You are looking at 1 - 10 of 566 items :

  • "ferrous sulfate" x
Clear All

DOI 10.1515/htmp-2012-0121   High Temp. Mater. Proc. 2013; 32(3): 303 – 308 Yan-tao Yu, Jin-hui Peng*, Bing-guo Liu, Guo Chen and C. Srinivasakannan Investigation on Preparation of Micro-Sized Hematite Powder from Hydrous Ferrous Sulfate Using Microwave and Conventional Heating Abstract: Microwave and conventional heating were em- ployed to synthesize micro-sized hematite powder from hydrous ferrous sulfate, a by-product in the process of tita- nium pigment manufacture. The TG/DTG analysis was used to  study thermal behavior of the industrial ferrous sul

in a substantial percentage of the women. The bioavailability of oral iron formulas displays considerable variation. In formulas with high bioavailability, the adequate iron dose is lower compared with formulas with low bioavailability. Ferrous iron chelates, such as ferrous bisglycinate (Aminojern ® ) appear to have at least two-fold higher biovailability/absorption compared to “conventional” iron salts, e.g., ferrous sulfate and ferrous fumarate [18, 23]. We therefore decided to perform a non-inferiority study comparing the effect of 25 mg ferrous iron as

other coagulants is its applicability over a wide pH range (4.5 to 12), meaning there is no need to adjust the pH of the water or effluent to be treated. A method for obtaining concentrated ferric sulphate coagulant using hydrogen peroxide consists of the initial solubilization of iron materials with sulphuric acid, leading to ferrous sulphate solution, followed by the oxidation of Fe 2+ to Fe 3+ by the addition of the oxidizing agent. The basic reaction is: (1) 2 FeS O 4 + H 2 S O 4 + H 2 O 2 = F e 2 ( S O 4 ) 3 + 2 H 2 O 2{\text{FeS}}{{\text{O}}_4} + {{\text{H}}_2

Z. phys. Chemie, Leipzig 264 (1983) 4, S. 794-800 i : Chemistry Department Maker ere University, Kampala (Uganda) Kinetics and Mechanism of the Oxidation of L-phenylalanine by Hydrogen Peroxide in the Presence of Ferrous Sulphate as a catalyst By C. Mohammed Ashraf, Iftikhar Ahmad1 and F. K. Nelson Lugemwa With 2 Figures and 3 Tables (Received 7th August 1979) Abstract The kinetics of oxidation of L-phenylalanine by hydrogen peroxide in the presence if Fe(II) ions has been studied. The reaction is first order with respect to hydrogen peroxide. The

by coagulation process and optimization of treatment conditions with response surface methodology. Applied Water Science . 2014, 6 (4), 1-10. [7] SHABEER T. P. A., SAHA A., GAJBHIYE V. T., GUPTA S., MANJAIAH K. M., VARGHESE E. Simultaneous removal of multiple pesticides from water: Effect of organically modified clays as coagulant aid and adsorbent in coagulation–flocculation process. Environmental Technology . 2014, 35 (20), 2619-2627. [8] AZIZ H. A., ALIAS S., ASSARI F., ADLAN M. N. The use of alum, ferric chloride and ferrous sulphate as coagulants in

microcosms (1-l glass flasks) to test the hypothesis that iron released from ilmenite through microbial action contributes to proliferation of phytoplankton. Microcosms containing ilmenite had significantly higher phytoplankton growth compared with controls containing no ilmenite or those containing only ferrous sulfate. Phytoplankton cell numbers in the ilmenite-supplemented treatment were 20= higher than in controls. The later stages were marked by the dominance of bottom dwelling Nitzschia spp. and Navicula spp. Iron-preferring Eunotia spp. and Pinnularia spp. were also

Abstract

The pharmacokinetics of ferrous methionate and ferrous sulphate was investigated in broiler chickens after intravenous injection and crop intubation. The iron compounds were injected intravenously in v. brachialis. After a 20-day “wash-out” period the ferrous methionate and ferrous sulphate were administered again by an elastic silicone tube into the crop. The serum concentrations of the iron were determined using a bioanalyser. Two pharmacokinetic approaches were used - compartmental and non-compartmental analysis. After i.v. injection we found statistically significantly longer and better distribution of the iron contained in the ferrous methionate compared to the ferrous sulphate. The АUC0→∞ was statistically significantly higher in the ferrous methionate. In the alimentary tract of broiler chickens, ferrous methionate was absorbed more rapidly than ferrous sulfate. It was also distributed at a higher volume as compared to the ferrous sulfate

Abstract

Simple iron gall inks composed of gallic acid, ferrous sulfate, and gum arabic and in some cases also of copper(II) sulfate were prepared. The process of iron ion complex formation with gallic acid was investigated using UV-VIS spectroscopy, pH measurements, and by monitoring the concentration changes of Fe(II) ions. The admixture of Fe(II) ions to gallic acid induced a bathochromic shift of absorption bands at 215 nm and 265 nm in the UV-VIS spectra. Formation of a new absorbance band in the visible area was also observed and used to calculate the initial rate of complex formation. Concurrently, the pH values and the concentration of Fe(II) ions in the solution decreased. Gum arabic significantly enhanced the complex formation and its stability. On the contrary, the addition of Cu(II) ions to the solution decelerated the complex formation considerably.

Abstract

Chemical mechanical polishing (CMP) wastewater generated from semiconductor manufacturing industries is known to contain residual organic and inorganic contaminants, i.e. photoresists, acids, including silicon dioxide (SiO2), nanoparticles (NPs) and others. Nanoscale colloids in CMP wastewater have strong inclination to remain in the suspension, leading to high turbidity and chemical oxygen demand (COD). Although various types of pre-treatment have been implemented, these nanoparticles remain diffused in small clusters that pass through the treatment system. Therefore, it is crucial to select suitable pH and coagulant type in the coagulation treatment process. In this research zeta potential and dynamic light scattering measurements are applied as preliminary step aimed at determining optimum pH and coagulant dosage range based on the observation of inter particle-particle behavior in a CMP suspension. The first phase of the conducted study is to analyze nanoscale colloids in the CMP suspension in terms of zeta potential and z-average particle size as a function of pH within a range of 2 to 12. Two types of coagulants were investigated - polyaluminum chloride (PACl) and ferrous sulfate heptahydrate (FeSO4·7H2O). Similar pH analysis was conducted for the coagulants with the same pH range separately. The second phase of the study involved evaluating the interaction between nanoscale colloids and coagulants in the suspension. The dynamics of zeta potential and corresponding particle size were observed as a function of coagulant concentration. Results indicated that CMP wastewater is negatively charged, with average zeta potential of -59.8 mV and 149 d.nm at pH value of 8.7. The interaction between CMP wastewater and PACl showed that positively charged PACl rapidly adsorbed colloids in the wastewater, reducing the negative surface charge of nanoscale clusters. The interaction between CMP wastewater and FeSO4·7H2O showed that larger dosage is required to aggregate nanoscale clusters, due to its low positive value to counter negative charges of CMP wastewater.

Nordic Pulp and Paper Research Journal Vol 24 no. 3/2009 255 KEYWORDS: TMP, Black spruce, Energy reduction, Hydrogen peroxide, Ferrous sulphate, Refining, Inter-stage tre- atment, Pulp and paper properties, Fenton’s reagent SUMMARY: The potential of using acid hydrogen peroxide for lowering the electrical energy consumption during production of Black spruce (Picea mariana) thermomechanical pulp (TMP) was investigated. The chemical system, which consisted of ferrous sulphate, hydrogen peroxide and optionally an enhan- cer [ethylenediaminetetraacetic acid