Showing papers on "Potassium nitrate published in 1974"
TL;DR: Two forms of the potassium nitrate were prepared: one form used saturated solutions, or 15%, 10%, 5%, 2%, and 1% solutions; the other form was a paste that contained 10%assium nitrate.
Abstract: Potassium nitrate obtained favorable results when it was used as a desensitizing agent for tooth hypersensitivity. Potassium nitrate was used as a desensitizing agent for tooth hypersensitivity. Two forms of the potassium nitrate were prepared: one form used saturated solutions, or 15%, 10%, 5%, 2%, and 1% solutions; the other form was a paste that contained 10% potassium nitrate. Both forms obtained favorable results.
119 citations
TL;DR: The effect of the composition of solutions in the direct potentiometric determination of total calcium content with an Orion calcium-selective electrode was investigated in this paper, where the results were accurate to within a few percent in the range 20-800 mg Ca l-1.
20 citations
Patent•
10 Oct 1974
TL;DR: A water-proof ignitor charcoal briquette as discussed by the authors is composed of charcoal and other charred or carbon fuel in powder form, homogeneously mixed with pulp powder impregnated in a solution of nitre such as potassium nitrate, sodium nitrate or potassium permanganate, so as to be capable of sustaining a long run combustion.
Abstract: A water-proof ignitor charcoal briquette, and the method of manufacture thereof, composed of charcoal and other charred or carbon fuel in powder form, homogeneously mixed with pulp powder impregnated in a solution of nitre such as potassium nitrate, sodium nitrate, potassium permanganate, excluding ammonium nitrate, so as to be capable of sustaining a long-run combustion, is compressed into individual units of various shapes using such combustible binder as resin and other known binders, and is further overcoated with such combustible solutions as resin and other known water-proof and easily ignitable solutions in order to be moisture proof as well as clean handling and at the same time to be readily ignited by a safety match or a cigarette lighter.
16 citations
TL;DR: In this article, the suitability of KNO3 as a dynamic temperature standard for DTA was investigated and the relation between the experimental procedure and the resulting curves was ascertained.
Abstract: Because of questions concerning the suitability of potassium nitrate as a dynamic temperature standard for DTA, the relation between the experimental procedure and the resulting curves was ascertained for the Standard Reference Material KNO3. The material behaves differentlyon cooling in open pans than in cylindrical holders because confinement in the latter case initiates reversion to the room temperature form. Under the conditions of use as a dynamic temperature reference material, the curves are accurately reproducible.
13 citations
8 citations
TL;DR: In this article, it is shown that relaxation time measurements can be used to study small structural changes in molten salt mixtures by NMR, even when chemical shifts are vanishingly small.
Abstract: It is shown that relaxation time measurements can be used to study small structural changes in molten salt mixtures by NMR, even when chemical shifts are vanishingly small The temperature dependence of the spin-lattice relaxation time of 7Li in pure lithium nitrate is compared with the quasilattice random flight model, and the correlation time τc is obtained The correlation time is then combined with measurements of the 7Li relaxation time in (lithium/potassium) nitrate mixtures to obtain the composition dependence of the electric field gradient at the lithium nucleus and the lithium-anion distance The results of relaxation time, chemical shift, and infrared measurements are compared
6 citations
TL;DR: In this article, the thermal and electrochemical properties of graphite in the molten alkaline nitrate have been correlated and an electrochemical reaction involving O 2 − ion and NO has been shown to proceed via an oxide on the graphite electrode surface which can be electrochemically reduced.
5 citations
01 Jan 1974
TL;DR: In this article, the three easily observed forms are the orthorhombic KNO3II, stable under standard conditions, a trigonal form, KNOoI, staole above 127.7°C at atmospheric pressure, and a second trigonal phase, kNO3III, which is typically formed when KNO 3I is cooled.
Abstract: Potassium nitrate exists in several crystalline forms depending upon both the temperature and the pressure (1,2). The three easily observed forms are the orthorhombic KNO3II, stable under standard conditions, a trigonal form, KNOoI, staole above 127.7°C at atmospheric pressure (3), and a second trigonal form, KNO3III, which is typically formed when KNO3I is cooled. The persistence of this form varies with, among other things, its degree of confinement; that is, the expansion of the crystallites transforming from I?III may be unrestrained in a shallow pan, but in a sample cup or well the points of contact are under pressure, so a confined sample transforms more quickly to the orthorhombic phase (4).
3 citations
TL;DR: The distribution ratio of iron(III) at initial concentration 10−4M has been measured using aqueous solutions of potassium nitrate and thiocyanate, at pH 2, with ionic strengths 0·25 and 0·50M, and an organic phase of tris(3,5,5-trimethylhexyl)amine in benzene as discussed by the authors.
Abstract: The distribution ratio of iron(III) at initial concentration 10–4M has been measured using aqueous solutions of potassium nitrate and thiocyanate, at pH 2, with ionic strengths 0·25 and 0·50M, and an organic phase of tris(3,5,5-trimethylhexyl)amine in benzene. Concentrations of thiocyanate and of the amine were varied. An extraction equation was derived and found to be in good agreement with the results up to a thiocyanate concentration of 0·025M. Values of extraction equilibrium constants were calculated in several ways.
2 citations
Patent•
11 Jun 1974
TL;DR: By the addition of a small quantity of potassium chloride or arsenous sulfide to commercial grades of molten potassium nitrate, the Potassium Nitrate may be activated or purified sufficiently to produce strengthened glass by ion exchange equal to glass strengthened by use of highly purified laboratory reagent grades of Potassium nitrate as mentioned in this paper.
Abstract: By the addition of a small quantity of potassium chloride or arsenous sulfide to commercial grades of molten potassium nitrate, the potassium nitrate may be activated or purified sufficiently to produce strengthened glass by ion exchange equal to glass strengthened by use of highly purified laboratory reagent grades of potassium nitrate.
2 citations
TL;DR: Kinetin has been observed to induce germination in the dormant seeds of Amaranthus spinosus Linn, and Celosia argentia Linn and ammonium nitrate has been found to be more effective than potassium nitrate.
TL;DR: In this article, a study was made of the reaction of technical potassium superoxide with nitrogen oxide (both pure and diluted with argon) and showed that the process proceeds at considerable speeds at the start, with a subsequent rapid slowing up and then a complete cessation of reaction.
Abstract: 1.
A study was made of the reaction of technical potassium superoxide with nitrogen oxide (both pure and diluted with argon).
2.
The process proceeds at considerable speeds at the start, with a subsequent rapid slowing up and then a complete cessation of the reaction.
3.
The reaction goes with the formation of potassium nitrite as the main reaction product and potassium nitrate as the secondary reaction product.
TL;DR: In this article, the reaction and properties of compounds in NE4N08-KNO3-K2S0A-(NH, )2SO4 system were investigated in order to study changes during storage of granular mixed fertilizers containing nitrate and sulfate.
Abstract: Reaction and properties of compounds in NE4N08-KNO3-K2S0A-(NH, )2SO4 system were investigated in order to study changes during storage of granular mixed fertilizers containing nitrate and sulfate. Among the samples of Table 1, S-1 tends to degrade while S-2 and F-1 cake. It has been found that a compound "B" NH4, (NO3) 2SO4 decomposes into nitrate and sulfate by heating at 80°C or 100°C under the presence of moisture as in the granulation and drying steps of the production (Table 2). During storage at room temperature, the nitrate and sulfate react to form "B" following the equations ( 1 ) and ( 2 ). The reaction ( 1), which col-respond to S-1, causes volume increase by 3.2% with heat emission resulting in the degradation of the granules. Minor volume decrease occurres with the reactions ( 2 ) and ( 3) which correspond to the samples 71 and S-2 respectively. Crystals of "B" formed on the surface of the granules of F-1 and caused the caking. A considerable amount of potassium chloride remained unreacted in the product of S-2; the chloride slowly reacted with ammonium nitrate during storage to form potassium nitrate and ammonium chloride resulting in the caking.
TL;DR: In this article, 1-Pentamethylene-3-nitroguanidine was synthesized by nitration of 1, 1-pentamethyleneguanidine (1) with nitric acid or potassium nitrate in conc. sulfuric acid.
Abstract: 1, 1-Pentamethylene-3-nitroguanidine (2) was synthesized by nitration of 1, 1-pentamethyleneguanidine (1) with nitric acid or potassium nitrate in conc. sulfuric acid.On reduction of (2) with Zn-AcOH, (1), 1, 1-pentamethylene-3-nitroso-guanidine (3), unkown oil (4), ammonia and 1, 1-pentamethylene-3-aminoguanidine (5) were obtained. These results can be explained by the following two competitive reactions ; 1) Direct formation of (5) from (2), (2) Consecutive degradation reactions : (2)→ (3) → (4) → (1) +NH2OH→NH3.Hydrogenation of (2) in the presence of Pd/C in hydrochloric acid and ethanol gave (1) in yields of 8186%. On hydrogenation of (2) in acetic acid, neutral and alkali solution, the degradation also occurred without forming (5) by the mechanism similar to the Zn-AcOH reduction.
TL;DR: In this paper, the copper/molten potassium nitrate system has been calculated and expressed as potential/pO2−, potential/PO2+ or potential/πO22− diagrams.
Abstract: Thermodynamic diagrams for the copper/molten potassium nitrate system have been calculated and expressed either as potential/pO2−, potential/pO2− or potential/pO22− diagrams. They exhibit the corresponding immunity, active dissolution, passivity and transpassivity regions.
TL;DR: The distribution ratio of iron(III) at initial concentration 10−4M has been measured using aqueous solutions of potassium nitrate and thiocyanate, at pH 2, with ionic strengths 0·25 and 0·50M, and an organic phase of tris(3,5,5-trimethylhexyl)amine in benzene as discussed by the authors.
Abstract: The distribution ratio of iron(III) at initial concentration 10–4M has been measured using aqueous solutions of potassium nitrate and thiocyanate, at pH 2, with ionic strengths 0·25 and 0·50M, and an organic phase of tris(3,5,5-trimethylhexyl)amine in benzene. Concentrations of thiocyanate and of the amine were varied. An extraction equation was derived and found to be in good agreement with the results up to a thiocyanate concentration of 0·025M. Values of extraction equilibrium constants were calculated in several ways.
TL;DR: In this article, the elektrochemische Verhalten von Graphit-and Pt-Elektroden in eutektischen KNO3- NaNO3 Schmelzen wird durch Aufnahme zyklischer Voltammogramme untersucht.
Abstract: Das elektrochemische Verhalten von Graphit- und Pt-Elektroden in eutektischen KNO3- NaNO3- Schmelzen wird durch Aufnahme zyklischer Voltammogramme untersucht.