Showing papers on "Potassium nitrate published in 1973"
TL;DR: In this article, the structure of alpha-phase potassium nitrate (KNO3) has been determined at room temperature (25 degrees C) and closer to the alpha to beta transition temperature at 100 degrees C, from three-dimensional neutron diffraction data.
Abstract: The structure of alpha -phase potassium nitrate (KNO3) has been determined at room temperature (25 degrees C) and closer to the alpha to beta transition temperature at 100 degrees C, from three-dimensional neutron diffraction data. The present results indicate that the potassium atoms experience small but significant displacements, predominantly along the (001) direction, as the temperature is increased. They also suggest that the NO3 groups are nonplanar, with the plane of the oxygen atoms making a small angle to the a-b face of the unit cell. Analysis of the atomic anisotropic thermal parameters, obtained from the least-squares refinements, suggests that the RMS vibrational amplitudes of the potassium atoms increase along the (001) direction as the temperature increases.
59 citations
21 citations
TL;DR: The levels of the NADP-specific malic enzyme in Fusarium oxysporum are controlled by both the carbon and nitrogen sources in which the cells are grown.
Abstract: The levels of the NADP-specific malic enzyme in Fusarium oxysporum are controlled by both the carbon and nitrogen sources in which the cells are grown. The enzyme is not induced by malate; maximum activity is obtained when the mycelium is grown on sucrose or ethanol. With ammonium sulfate as the nitrogen source, one enzyme-activity peak is obtained by 40 h, while in the presence of potassium nitrate this peak is repressed, with a peak appearing at a later stage of growth. In ammonium nitrate, two enzyme-activity peaks are present, one corresponding to the peak present in ammonium sulfate and the other to the peak present in potassium nitrate grown cells.When the initial velocities are plotted against increasing malate concentration non-Michaelis–Menton kinetics are obtained. The double-reciprocal plots are biphasic and Rs values of 161 are obtained. Hill plots prepared from initial velocity data show that at low malate concentration, the slope of the line is 0.87, and it decreases to 0.45 at 1.32 × 10−3 M...
15 citations
12 citations
TL;DR: With potassium ferricyanide copper(II) forms KCu(10),[Fe(CN)(6)](7) quantitatively in 0.5M potassium nitrate medium, and silver forms Ag(3)Fe( CN)(6) only.
11 citations
8 citations
TL;DR: In this article, the composition and stability constants of complexes of copper(II) with nitrilotriacetic acid were studied in aqueous 0·1 M potassium nitrate solution at 25°C by means of a solid-state copper-ion-sensitive electrode.
6 citations
6 citations
01 Jan 1973
5 citations
4 citations
29 Mar 1973
TL;DR: In this article, it has been shown that the growth of Minol II charges during temperature cycling is caused by the polymorphic phase transition which occurs in ammonium nitrate (AN) above 32C.
Abstract: : Minol II (40% ammonium nitrate, 20% aluminum) is useful as an explosive fill for bombs, because its use substitutes cheap, and abundant, ammonium nitrate (AN) for more expensive, and sometimes scarce, TNT. However, Minol II exhibits poor dimensional stability when exposed to temperature cycles during storage. It has been shown that growth of Minol II charges during temperature cycling is caused by the polymorphic phase transition which occurs in AN above 32C. Review of the literature suggested that this phase transition could be prevented by substitution of a solid solution of potassium nitrate (KN) in AN for AN in explosive compositions. Some of the reported properties of such solid solutions (KN-AN-III or AN-KN) have been confirmed. Charges containing 40% TNT, 40% AN-KN and 20% aluminum (now designated Minol IV) showed better dimensional stability during temperature cycling than either TNT or TNT/ aluminum (67/33).
TL;DR: The increase of survival of ultraviolet irradiated Escherichia coli cells, due to the splitting of thymine dimers to monomers by photoreactivation, is inhibited by potassium nitrate.
Abstract: The increase of survival of ultraviolet-irradiated Escherichia coli cells, due to the splitting of thymine dimers to monomers by photoreactivation, is inhibited by potassium nitrate. The possible mechanisms of the inhibition are discussed. (auth)
TL;DR: In this paper, the solubility of silver chloride and bromide as a function of the corresponding halide concentration has been measured in molten Ca(NO3)2,1·925KNO3, in the temperature range 160-200 °C. by use of 110Ag as radioactive tracer.
Abstract: The solubility of silver chloride and bromide as a function of the corresponding halide concentration has been measured in molten Ca(NO3)2,1·925KNO3, in the temperature range 160–200 °C. by use of 110Ag as radioactive tracer. The solubility products and the consecutive stability constants for metal halide complex species were determined and the ΔG°, ΔH°, and ΔS° values of the corresponding equilibria evaluated. The results are compared with data obtained in other nitrate melts and discussed in terms of a quasi-lattice model for reciprocal molten salt systems.
TL;DR: In this paper, the authors used short-circuit amperometry to identify the presence of tetraphenylborate in a neutral supporting electrolyte (such as sodium nitrate) with a silver nitrate solution using a rotating platinum wire electrode as the indicator and a reference SCE electrode.
Abstract: Tetraphenylborate ion was titrated in the presence of a neutral supporting electrolyte (such as sodium nitrate) with a silver nitrate solution by short-circuit amperometry using a rotating platinum wire electrode (1000 rpm) as the indicator and a reference SCE electrode. A O.004mol/1 sodium tetraphenylborate s 1ution in the prese ce f o.1 m 111 sodium nitrate was titrated accurately with a coefficient of variation less than O.1%. Surface active agent such as poly (vinyl pyrrolidone), triton X-100 and triton X-405 at the concentration less than O.0160. did not interfere with the titration.A method for the determination of potassium ion was as follows. An excess of sodium tetraphenylborate solution was added to an aqueous solution of potassium nitrate at about 800C to form the precipitate of potassium tetraphenylborate. After the solution was cooled to room temperature, sodium nitrate (final concentration O.1 mol/1) was added as the supporting electrolyte, and poly(vinyl pyrrolidone) (O. Ol%)to prevent the potassium tetraphenylborate precipitate from reacting with silver ion. Then the residual tetraphenylborate ion was titrated.This method is applicable to the determination of potassium in sea water. Firstly, the sum of the residual quantity of tetraphenylborate ion added and all of the halide ions were titrated, then all the halide ions were titrated with a silver nitrate solution for another a1iquot of the sample solution in order to estimate the quantity of potassium ions.
TL;DR: In this paper, the authors measured the potential at the interfaces between degummed silk fibers and aqueous solutions containing a number of trivalent metal nitrates by means of the streaming potential method.
Abstract: The ζ-potential at the interfaces between degummed silk fibre and the aqueous solutions containing a number of trivalent metal nitrates was measured by means of the streaming potential method. The trivalent metals used were Al, Ga, In, Cr, Fe, Rh, Sc, Y, La, Sm, Tb, Er and Yb.At pH 5.0, generally, the negative ζ-potential decreases with increasing concentration of metal salt. In the cases of Al, Ga, In, Cr, Fe, Rh and Sc, it reverses its sign at concentrations in the region of 10-6-10-4M and then approaches a limiting positive value which differs for each metal salt: the sequence for the reversal of charge concentrations is Fe Ga>Rh. In the cases of Al, In, Cr and Sc, with increasing concentration of metal salt, the ζ-potential decreases and nearly becomes zero at concentrations in the region of 10-6-10-5M. At higher concentrations it rises slightly. In other cases, the ζ-potential decreases with increasing concentration of metal salt and reaches a negative value. The decrease in the ζ-potential is due to the adsorption of nitrate ions: this was discussed by measuring the ζ-potential for potassium nitrate.
Patent•
16 Jan 1973
TL;DR: In this paper, a granular or crystalline salt or fertilizer is provided with a coating to avoid dust formation and agglomeration, the coating comprising a polyethylene wax and/or polypropylene wax of mean M.W. from 500 to 10,000 and having a penetrometer number of not more than 3, and a surfactant.
Abstract: 1292718 Coated fertilizers BADISCHE ANILIN- & SODA-FABRIK AG 5 Feb 1970 [6 Feb 1969] 5573/70 Headings C1A and C1B [Also in Divisions B2 and C2] A granular or crystalline salt or fertilizer is provided with a coating to avoid dust formation and agglomeration, the coating comprising a polyethylene wax and/or polypropylene wax of mean M.W. from 500 to 10,000 and having a penetrometer number of not more than 3, and a surfactant. Specified salts/fertilizers are urea, calcium nitrate, sodium nitrate, potassium nitrate, calcium ammonium nitrate, nitrophosphates, potassium sulphate, potassium chloride and sodium chloride, and various fertilizers specified by NPK and NPKMg proportions. The surfactant may be anionic, cationic or non-ionic and examples of each type are given.
TL;DR: Nine inorganic nitrogenous compounds and sixteen amino acids were used to study the growth and sporulation of highly and weakly virulent isolates of Colletotrichum falcatum Went, and glycine and DL-alanine were best for growth and L-cystine for sporulation.
Abstract: Nine inorganic nitrogenous compounds and sixteen amino acids were used to study the growth and sporulation of highly and weakly virulent isolates ofColletotrichum falcatumWent. Potassium nitrate, sodium nitrate and calcium nitrate supported good growth, while ammonium phosphate, potassium nitrate and sodium nitrate supported good sporulation of both isolates. Among the amino acids tested, glycine and DL-alanine were best for growth, and DL-threonine, L-leucine, DL-tyrosine, DL-serine, DL-phenylalanine and L-cystine for sporulation. No correlation existed between virulence and growth but the highly virulent isolate sporulated significantly more than the weakly virulent isolate.
TL;DR: Two methods by which molybdenum metal coatings may be removed from plutonium dioxide shards are: (a) fusion of the coated shards in a mixture of potassium nitrate and potassium hydroxide, cooling t...
Abstract: Two methods by which molybdenum metal coatings may be removed from plutonium dioxide shards are: (a) fusion of the coated shards in a mixture of potassium nitrate and potassium hydroxide, cooling t...
01 Oct 1973
TL;DR: The carbon and nitrogen nutrition of Microxyphiella hibiscifolia (Gossypium hirsutum L) was studied at 28°C for 14 days at pH 4·0 as mentioned in this paper.
Abstract: The carbon and nitrogen nutrition ofMicroxyphiella hibiscifolia Bat., Nasc., and Cif., isolated from the leaves of cotton (Gossypium hirsutum L.), was studied at 28° C for 14 days at pH 4·0. Out of forty-one carbon compounds tested, the pathogen showed excellent growth on dextrose, sucrose, starch, raffinose and maltose; good on inulin; fair on melibiose and galactose; and poor or no growth on rest of the carbon compounds. The pathogen showed excellent sporulation on all the carbohydrates, in general. Out of thirty-three nitrogen compounds tested, the pathogen showed excellent growth on peptone, asparagine, proline, ammonium oxalate, yeast extract, ammonium phosphate, ammonium sulphate; good on ammonium chloride, serine, ammonium nitrate, urea, sodium nitrate, potassium nitrate, histidine mono HCl and histidine di HCl; fair on glutamic acid, lysine mono HCl, arginine mono HCl, threonine, nor-valine and glycine; and poor or no growth on rest of the nitrogen compounds. The pathogen showed excellent or good sporulation, in general, on all the nitrogen compounds. The utilisation of potassium nitrite was conditioned by the pH of the medium.
TL;DR: In this article, the Loslichkeit von AgCl and AgBr in Ca(NO3)2·1,925 KNO3-Schmelzen bei 160-200°C wurde unter Verwendung von 110Ag bestimmt.
Abstract: Die Loslichkeit von AgCl und AgBr in Ca(NO3)2·1,925 KNO3-Schmelzen bei 160-200°C wurde unter Verwendung von 110Ag bestimmt.