Solution Of Ferrous Ammonium Sulphate Research Articles

Analytical Studies on the oxidation of cysteine, cystine and Methionine with V(v) reagent

A simple, quick and convenient method has been developed for the micro estimation of S- containing amino acids. The sample 1-5 mg is allowed to react with 2 ml of 0.3N ammonium metavanadate (v) reagent and 10 ml of 10N H2SO4 was added, before the reaction helps in detecting the end point. The unconsumed reagent can be accurately titrate with 0.025 N ferrous ammonium sulphate solution using N-phenyl anthranilic acid as indicator. Standard deviation as well as coefficient of variation was calculated for reproducible and accurate result. The accuracy of the method in within + 1%

Electrodeposited epitaxialFe100−xCoxfilms onn−GaAs(100)

The electrodeposition of epitaxial cube-on-cube Fe{sub 100-x}Co{sub x} films onto (100)-oriented n-GaAs from ferrous ammonium sulfate solutions containing various concentrations of cobalt sulfate is described. The cobalt composition in a series of 400-nm-thick films was found to vary in proportion to the concentration of cobalt sulfate in the electrolyte and six compositions in the range from 0 to 74% were deposited. Epitaxial (100)-oriented bcc films were produced throughout this range, as suggested by symmetrical x-ray diffraction and confirmed by x-ray pole figure measurements. Rocking curve measurements yielded data that could be fitted to the sum of a Lorentzian and a Gaussian, corresponding to the (200) Fe{sub 100-x}Co{sub x} planes and to a residual contribution from GaAs (400), respectively. The full width at half maximum obtained for the film Lorentzians varied from 0.44 deg. to 0.90 deg. and was apparently uncorrelated with composition. X-ray (211) pole figure measurements revealed a high degree of twinning of the (100) bcc Fe{sub 100-x}Co{sub x} consistent with a recent study of Fe films electrodeposited on n-GaAs.

Ferrous–Ferric Ion exchange dosemeter

In this work a three-dimensional ferrous-ferric ion exchange dosemeter is proposed and the dose response measured. The dosemeter consists of strong acid cation exchange resin beads in the H form in water. Amberlyst 15 Wet beads with a harmonic mean diameter of 0.600-0.850 mm were prepared by soaking them in an aqueous solution of ferrous ammonium sulphate to exchange ferrous ions for H(+) ions. The beads were rinsed with distilled water and packed in glass vials. Sets of samples with ferrous ion concentrations of 0.5 and 1.0 mM were dosed with 6 MV X rays from a Varian 2100C linac. The spin-lattice relaxation time constants (T1) for the samples were measured using an Apollo spectrometer (Tecmag, Houston, TX) interfaced to a 1.5 T magnet (Magnex, Abingdon, UK). Each sample had two T1 values; a long T1 at 1200 ms that did not significantly change with dose and a short T1 that ranged from 56 ms at 0 Gy to 36 ms at 100 Gy. The R1 vs. dose responses were linear with slopes of 0.066 and 0.079 s(-1) Gy(-1).

A volumetric method for the determination of sulphoxides

A volumetric method for the quantitative determination of Sulphoxides has been developed, based on their oxidation to sulphones by dichromate in presence of 5 M sulphuric acid at 105–110°C. Excess dichromate is titrated by ferrous ammonium sulphate solution. The method is also applicable to the determination of Sulphoxides in metal sulphoxide complexes.

A high-temperature, hydrogen-oxidizing bacterium--Hydrogenomonas thermophilus, n.sp.

WE have succeeded in isolating in pure culture from petroliferous soil a thermophilic bacterium which utilizes hydrogen. The isolation was accomplished by streaking material from a soil enrichment culture on to Repaske's mineral salts medium prepared by mixing equal volumes of a sterile 4 per cent agar solution in water and a sterile, double-strength solution of mineral salts containing ammonium chloride, MgSO4·7H2O, CaCl2·2H2O, potassium dihydrogen phosphate, sodium monohydrogen phosphate, and several trace elements. On cooling to about 50° C, 1 ml. of a solution of ferrous ammonium sulphate was added, the plates poured, allowed to solidify and immediately streaked. The plates were incubated in an atmosphere containing 70 per cent hydrogen, 20 per cent oxygen, and 10 per cent carbon dioxide at 50° C. By picking the minute, flat, smooth, translucent colonies into liquid mineral salts medium and incubating in the 70–20–10 gas mixture, a pure culture was obtained.

The Oxidation of Fe2+ by Ultrasound

Abstract With the help of Milliard’s high frequency ultrasonic generator, type E-7562, with a barium titanate transducer with a frequency of 1 Mc, the oxidation of an acidic ferrous ammonium sulphate solution has been studied. The kinetics of the reaction, at six different concentrations of a ferrous ammonium sulphate solution and at four different ultrasonic intensities has been investigated. The reaction has been found to obey the first order kinetics. A probable mechanism based on the Haber-Weiss work has also been proposed.

MILK IRON AND PLASMA IRON TRANSPORT IN A LACTATING MARSUPIAL DURING SHORT-TERM INTRAVENOUS INFUSION OF IRON.

SummaryIn the lactating quokka (Setonix brachyurus) parenteral iron. as ferrous ammonium sulphate solution, was administered in an attempt to raise the milk iron. Following a single large intraperitoneal dose a rise in milk iron occurred within hours. There was, however, no clear relationship between the rise and the amount of iron injected and there was reason to believe the rise had been associated with unphysiologically high plasma iron cocentrations. During continuous intravenous infusion of iron at controlled rates plasma iron was elevated to maximal levels not exceeding plasma total iron binding capacity and under these conditions no significant alteration in milk iron occurred within four hours.A progressive and statistically significant rise in total plasma iron binding capacity which occurred during intravenous infusion of iron was probably the manifestation of a redistribution of intra‐ and extravascular transferrin in response to the need for more rapid removal of iron from the plasma.

Proceedings of the British Institute of Radiology

Proceedings of the British Institute of RadiologyPublished Online:28 Jan 2014https://doi.org/10.1259/0007-1285-35-417-650SectionsPDF/EPUB ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InEmail AboutAbstractExperiments are described in which a 4 MeV linear electron accelerator was used to give a dose of ∼10,000 rads to a small liquid sample in 2 μseconds. Chemical reactions occurring in the sample were observed by measuring optical transmission in situ as a function of time at any chosen wavelength with the usual arrangement of light source, monochromator and cathode-ray oscilloscope. In ferrous ammonium sulphate solution this technique showed the existence of four distinct steps in the reaction with widely separated mean times. Each step appeared to be exponential and the slowest (lasting several seconds) was undoubtedly due to H2O2 oxidation. A study of oxygen dependence, Fe++ concentration dependence, and variation of spectrum with time made possible a tentative assignment of the three earlier steps to OH oxidation, HO2 oxidation and the build-up of the ferric-sulphate complex. In potassium iodide solution the linear build-up of di-iodide ion during the 2 μsecond pulse itself was observed, followed by decay of this unstable species to tri-iodide. Pure water showed several transient absorptions, all of which ultimately decayed to zero. Previous article Next article FiguresReferencesRelatedDetailsCited byFree Radical Mechanisms for the Treatment of Methyl tert -Butyl Ether (MTBE) via Advanced Oxidation/Reductive Processes in Aqueous Solutions23 January 2009 | Chemical Reviews, Vol. 109, No. 3Formate Ion Decomposition in Water Under UV Irradiation at 253.7 nm15 June 2004 | Environmental Science & Technology, Vol. 38, No. 14La radiolyse de l'eau et des solutions aqueuses : historique et actualitéCanadian Journal of Chemistry, Vol. 77, No. 9Rate of Hydrogen Atom Reaction with Ethanol, Ethanol- d5 , 2-Propanol, and 2-Propanol- d7 in Aqueous Solution13 February 1997 | The Journal of Physical Chemistry A, Vol. 101, No. 7 Volume 35, Issue 417September 1962Pages: 581-652 © The British Institute of Radiology History Published onlineJanuary 28,2014 Metrics Download PDF

Colorimetric rapid determination of silicon in copper-beryllium alloys

Rapid determination of silicon in Be-Cu alloys is studied by a colorimetric molybdenum blue method. The sample is dissolved by H₂SO₄ (1:6) and H₂O₂, and heated to decompose the H₂O₂. After dilution, a 10% ammonium molybdate solution is added. After 5 min, 4% HF and 30% ferrous ammonium sulfate solutions are added. The absorption of molybdenum blue is measured at 750 m mu . The time requ-ired for an analysis is about 20 min. (auth)

The Oxidation of Ferrous Ammonium Sulfate Solutions by Electron Irradiation at High Dose Rates

Irradiation The linear accelerator was operated at 50 pulses per second, and single pulses of electrons were selected by a synchronized mechanical shutter. Each pulse lasted 1.7 ,usec, had a fairly sharp rise and fall time (~0.2 ,usec), and carried a total charge in the region of 10-7 coulomb. The current during the pulse was thus approximately

Dichrometric estimation of phosphite and hypophosphite silver salt catalysis

1. It has now been shown that it is possible to determine accurately phosphite and hypophosphite with potassium dichromate. The method consists in heating the hypophosphite or phosphite with a known excess of dichromate in 2 N sulphuric acid with 2 ml. (per 50 ml. of reaction mixture) of 5% silver sulphate as a catalyst on the boiling water bath for one hour; and estimating the unreacted dichromate with a standard solution of ferrous ammonium sulphate. 2. The method has the advantage that potassium dichromate is by itself an excellent primary standard.

Volumetric estimation of indigo and indigo sulphonic acid with potassium dichromate

The reaction between indigo sulphonate and chromic acid has been studied under various conditions, with a view to its analytical application. When indigo sulphonate is treated with an excess of chromic acid in 0.7 N sulphuric acid, indigo is quantitatively oxidised to isatin. The excess of unreacted chromic acid can be determined iodimetrically or by titration with standard ferrous ammonium sulphate solution. At higher acid concentration, the reaction is not quantitative, the chromic acid consumed being somewhat less than the theoretical.

Vanadametry Estimation of Thiosulphate

1.(a) We have found that sodium thiosulphate is quantitatively oxidized to tetrathionate in five minutes at room temperature (28°) by excess sodium vanadate in a medium containing sulphuric acid at 0.06 N to 0.1 N concentration and a little copper sulphate as catalyst. (b) Quantitative emulation of sodium thiosulphate to tetrathionate has also been achieved by the action of excess sodium vanadate during five minutes at room temperature in a medium containing 2.0 N—8.0 N acetic acid and a little copper salt as catalyst. Further oxidation to sulphate does not occur, even if the mixture is heated to boiling. (c) The excess of unreacted vanadate in 1(a) and 1(b) can be titrated with a standard solution of ferrous ammonium sulphate using diphenylbenzidine as indicator, after adding the requisite quantity of syrupy phosphoric acid. 2. On the other hand, sodium thiosulphate is easily and quantitatively oxidized to sulphate at room temperature, when. acted upon by excess sodium vanadate in a medium containing hydrochloric acid at an overall concentration of 5-6 N and 1.0 ml of iodine monochloride as catalyst. The time required for reaction is ten minutes. The unreacted vanadate can be estimated by titration with a standard solution of ferrous ammonium sulphate, using N-phenylanthranilic acid as indicator or with diphenylbenzidine as indicator after suitably diluting and adding phosphoric acid.

Irradiation of Ferrous Ammonium Sulfate Solutions: Energy Absorption and Ionization Calculations for Cobalt-60 and Betatron Radiation

G values for the irradiation of ferrous ammonium sulfate by cobalt-60 and betatron radiation have been recalculated taking into account wall effects which were neglected in the original paper.

Irradiation of Ferrous Ammonium Sulfate Solutions: Energy Absorption and Ionization Calculations for Cobalt 60 and Betatron Radiation

Solutions of ferrous ammonium sulfate in 0.8N H2SO4 have been irradiated with Co60 gamma rays and with x-rays from a 25-Mev betatron. The energy absorbed per unit volume of solution has been calculated from a modification of the Bragg-Gray formula, Ev=JvWρ in which the factor ρ was determined according to a calculated distribution of primary electron energies. The chemical yield was then calculated in terms of G, the number of ferrous ions oxidized per 100 ev absorbed.

Oxidation of Aqueous Ferrous Ammonium Sulfate Solutions by Betatron Radiation

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A Note on the Formation of Polymers in Wool

When wool fibres are impregnated with a dilute solution of ferrous ammonium sulphate and then treated with a mixture of hydrogen peroxide and methacrylamide in an atmosphere of nitrogen at 50°c, internal deposition of polymer takes place extremely slowly and reproducible results are difficult to obtain1. Those difficulties seem to be due to reaction between hydrogen peroxide and the monomer during uncontrolled times of standing before addition to the wool, because more rapid and reproducible deposition of polymer has now been realised simply by adding the solution of methacrylamide to the impregnated wool before the hydrogen peroxide.

Identification of the End-Amino Groups of Wool by Means of their 2 : 4-Dinitrophenyl Derivatives

THE amino-acids with free α-amino groups in wool have been identified using Dr. F. Sanger's technique1. Considerable use was made of buffered, as well as unbuffered, silica gel columns, using Sanger's original solvents. The gel was buffered at pH 6.0 with 0.5 ml. buffer solution (9.36 gm. NaH2PO4.2H2O + 14.32 gm. Na2HPO4.12H2O per 100 ml. solution) per gm. silica. This was used in conjunction with (a) ether, (b) 1 per cent butanol–chloroform, (c) 30 per cent butanol–chloroform, (d) 5 per cent propanol–eyclohexane, (e) 33 per cent ether-ligroin as solvents. The ether was freed from peroxides by shaking with an acid solution of ferrous ammonium sulphate, followed by several changes of distilled water, and stored in a dark bottle. In agreement with other workers2,3, leucine could not be separated from valine on unbuffered columns, but this was easily achieved by using 0·5 ml. solution (7·16 gm. Na2HPO4.12H2O + 7·60 gm. Na3PO4.12H2O per 100 ml. solution) per gm. silica with ether as solvent. The acids were identified as (a) valine, (b) alanine, (c) glycine, (d) threonine, (e) serine, (f) glutamic acid, (g) aspartio acid.

The Formation of Polymers in Wool*

When wool fibres are impregnated with a dilute solution of ferrous ammonium sulphate, dried, and then treated with a solution of methacrylic acid containing a trace of hydrogen peroxide, preferential internal polymerisation is brought about by the hydroxyl radicals formed inside the fibres when the hydrogen peroxide encounters the ferrous ions. The reaction proceeds best at low j>H values in absence of oxygen. Preferential internal polymerisation of water–insoluble monomers can also be brought about if they are emulsified with Lissolamine V, and no difficulty has been encountered in forming copolymers of methacrylic acid and methyl methaerylate, for example, within the fibres.Such internal deposits of polymer can be used to modify the properties of wool in a number of ways. When the polymer is acid, two–tone effects can be obtained by dyeing treated and untreated wool in the same dyebath, the treated wool taking a lighter shade. Conversely, when the polymer is basic, the treated wool takes a darker shade. In addition, internal deposits of polymer are capable of increasing the wear–resistance and reducing the milling shrinkage of wool fabrics. Finally, if the monomer carries reactive side–chains, e. g. methacrylamide, internal polymerisation followed by cross–linking with formaldehyde causes a striking increase in the resistance of wool fibres to extension in water. It is not yet known whethor cross–linkages are formed between the polymer and the wool, but reactions of this type should be useful in strengthening intact fibre and repairing damaged fibres.

Paramagnetism and the Electronic Configuration of the Atom

IN a recent note1 Foëx has directed attention to the fact that two samples of a paramagnetic salt, well defined chemically and placed in identical conditions, can possess very different magnetic properties, apparently corresponding to distinct states of the paramagnetic ion in the salt. This diversity of the magnetic states has been known for some time for the case of solutions of the salts.2 Thus a concentrated solution of ferrous ammonium sulphate exists in four states: 26 magnetons with a positive molecular field, 26.5 without an appreciable molecular field, 27 and 27.5 with a negative molecular field.