Potassium nitrate

About: Potassium nitrate is a research topic. Over the lifetime, 3537 publications have been published within this topic receiving 29450 citations. The topic is also known as: Nitric acid, potassium salt & Saltpeter.

Studies on polytetrafluoroethylene latices Part 3. Electrophoretic mobility in univalent electrolytes

Abstract: The electrophoretic mobilities of particles of polytetrafluoroethylene (PTFE), prepared by a dispersion polymerisation technique using a peroxyacid initiator, have been determined using a mass transport technique. Investigations were carried out as a function of sodium chloride concentration at pH 9 and as a function of pH in the presence of various salts, namely, sodium chloride, potassium nitrate and potassium thiocyanate. The particles were found to have a low surface charge density, consistent with the idea that sparsely distributed charged sites originated from initiator fragments leaving the major part of the surface in a hydrophobic condition. Below a pH of ca. 4.5 increases of mobility with decreasing pH were observed with chloride and thiocyanate as the anion. These were attributed to an anion adsorption process, dependent on thepKa of the surface groups, and a model for the process is described.

Nutrient solution for tree

Abstract: The invention discloses a nutrient solution for a tree. The nutrient solution is characterized in that every 1,000 ml of the nutrient solution contains 1,000 to 1,200 mg of potassium nitrate, 2,100 to 2,250 mg of urea, 1,900 to 2,050 mg of ammonium nitrate, 140 to 160 mg of magnesium sulfate, 1,200 to 1,230 mg of ammonium dihydrogen phosphate, 1,360 to 1,380 mg of calcium nitrate, 1,190 to 1,210 mg of monopotassium phosphate, 160 to 180 mg of manganese sulfate, 10 to 12 mg of zinc sulfate, 12 to 14 mg of ferric citrate, 160 to 180 mg of vitamin A, 120 to 140 mg of vitamin C, 80 to 120 mg of vitamin B6, 1 to 2 mg of boric acid, 0.3 to 0.4 mg of sodium molybdate, 0.15 to 0.31 mg of sodium iodide, 0.1 to 0.2 mg of folic acid, 1.5 to 1.7 mg of asparaginate, 1 to 2 mg of fulvic acid, 0.5 to 0.7 mg of indolebutyric acid, 0.8 to 1.2 mg of gibberellins and the balance of water. The nutrient solution for the tree has the beneficial effects that the nutrient solution does not contain a harmful substance, and can supply nutrients for growth to plants subjected to soilless culture.

Preferential nitrate immobilization in alkaline soils

Abstract: The literature pertaining to N immobilization indicates that ammonium is immobilized in preference to nitrate. Our previous research in an alkaline clay soil has indicated substantial immobilization of nitrate. To verify the preference for immobilization of nitrate or ammonium by the microbial biomass in this and other soil types, the immobilization of ammonium and nitrate from applications of ammonium sulfate and potassium nitrate following the addition of cotton crop stubble was monitored in six soils. The preference for ammonium or nitrate immobilization was highly correlated with each soil's pH, C/N ratio and its nitrification capacity. Nitrate was immobilized in preference to ammonium in neutral and alkaline soils; ammonium was preferentially immobilized in acid soils. No assimilation of nitrate (or nitrification) occurred in the most acid soil. Similarly, little assimilation of ammonium occurred in the most alkaline soil. Two physiological pathways, the nitrate assimilation pathway and the ammonium assimilation pathway, appear to operate concurrently; the dominance of one pathway over the other is indicated by soil pH. The addition of a nitrification inhibitor to an alkaline soil enhanced the immobilization of ammonium. Recovery of 15N confirmed that N was not denitrified, but was biologically immobilized. The immobilization of 1 5 ~ and the apparent immobilization of N were similar in magnitude. The identification of preferential nitrate immobilization has profound biological significance for the cycling of N in alkaline soils.

Effect of nitrogen sources on oxidoreductive enzymes and ethanol production during D-xylose fermentation by Candida shehatae.

Abstract: The effect on D-xylose utilization and the corresponding xylitol and ethanol production by Candida shehatae (ATCC 22984) were examined with different nitrogen sources. These included organic (urea, asparagine, and peptone) and inorganic (ammonium chloride, ammonium nitrate, ammonium sulphate, and potassium nitrate) sources. Candida shehatae did not grow on potassium nitrate. Improved ethanol production (Y(p/s), yield coefficient (grams product/grams substrate), 0.34) was observed when organic nitrogen sources were used. Correspondingly, the xylitol production was also higher with organic sources. Ammonium sulphate showed the highest ethanol:xylitol ratio (11.0) among all the nitrogen sources tested. The ratio of NADH- to NADPH-linked D-xylose reductase (EC 1.1.1.21) appeared to be rate limiting during ethanologenesis of D-xylose. The levels of xylitol dehydrogenase (EC 1.1.1.9) were also elevated in the presence of organic nitrogen sources. These results may be useful in the optimization of alcohol produc...

Thermochemistry of anion mixtures in simple fused salt systems. ii. solutions of some salts of mo4- and mo4-2 anions in the corresponding alkali nitrates

Abstract: Calorimetric measurements were performed on the heats of solution and of dilution of potassium perchlorate in potassium nitrate, of sodium, potassium, rubidium, and cesium perrhenate in the corresponding nitrates, and of sodium sulfate, chromate, and molybdate in sodium nitrate. From the results were derived values of the interaction parameters for the liquid-liquid mixtures, and of the heats of fusion of the considered solutes at the temperatures of the measurements. New, approximate values of the heats of fusion (at the melting points) of the perrhenates and of potassium perchlorate are derived from the measurements. The new interaction parameters are discussed and compared with values previously obtained for the solutions of alkali bromides and chlorides in the nitrates. (auth)