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.

Exogenous application of potassium nitrate to alleviate salt stress in rice seedlings

Abstract: □ Overall growth characteristics of many plant species cultivated in soil affected by salinity could be alleviated by the application of potassium nitrate (KNO3) to the soil. The aim of this research was to investigate salt-tolerance in a salt-sensitive rice cultivar, ‘Pathumthani 1’ (PT1), in response to the exogenous application of 11.8 mM KNO3, in comparison to ‘Homjan’ (HJ), a salt tolerant cultivar. Water potential (ψw) in both the roots and leaves of PT1 seedlings under salt stress dropped significantly, while it was maintained in PT1 pretreated with KNO3, and similarly in HJ. The reduction of leaf water potential was positively related to total chlorophyll degradation, leading to diminished chlorophyll fluorescence, directly affecting growth in plants exposed to salt stress. In salt-sensitive PT1, the application of 11.8 mM KNO3 improved salt-tolerance via the conservation of water use efficiency, the maintenance of photosynthetic pigments, enhancement of chlorophyll a fluorescence, and stimulation...

Heat transfer and storage medium containing low melting point mixed molten salt

Abstract: The invention relates to a heat transfer and storage medium containing low-melting point mixed molten salt and belongs to a physical heat transfer and energy storage technology in a high and new technology. The heat transfer and storage medium is characterized by comprising the following components in percentage by weight: 25.1wt% of calcium nitrate, 50.0wt% of potassium nitrate, 8.3wt% of sodium nitrate, 8.3wt% of lithium nitrate and 8.3wt% of potassium carbonate. The mixed molten salt has the melting point of 83.7 DEG C and the decomposition temperature of 592.9 DEG C. According to the technology, after a plurality of molten salt is mixed together to form eutectic mixed molten salt, the melting point of an eutectic molten salt mixture can be obviously reduced; the eutectic mixed molten salt can ensure stable and uniform phase and component thermo-physical property within the wider operating temperature range; the more the components of the mixed molten salt are, the lower the melting point of the mixture is, the decomposition temperature can also correspondingly reduced, and the thermo-physical property of the eutectic mixed molten salt varies from the components and the proportion of the eutectic mixed molten salt. Therefore, in the mixed molten slat preparation, the needs from all parties have to be balanced, and the component type and the proportion of the mixed molten slat need to be carefully chosen.

Polarography of some coordination compounds of platinum. I. Hexammineplatinum (IV) and Tris(ethylenediamine)platinum(IV) ions

Abstract: The polarographic reduction of tris(ethylenediamine)platinum(IV) and the hexammineplatinum(IV) ions has been studied in potassium chloride, potassium nitrate, and potassium nitrate plus ammonia solutions. Both ions were reduced irreversibly producing similarly shaped waves, showing well-defined diffusion current regions corresponding to two-electron reductions of the complexes. A linear relationship existed between diffusion current and concentration within the range examined. In aqueous potassium chloride and potassium nitrate media, the waves contained slight inflexions at positions corresponding to one-electron additions. The phenomenon suggested the transient presence of platinum(III) ions, and indicated that the half-wave potential of the reduction of the complexes to the trivalent state was very close to the half-wave potential of the reduction from platinum(IV) to platinum(II). The values were so close together as to indicate the improbability of isolating the trivalent complexes. Gelatin enhanced the inflexion in the wave but shifted the wave in a more negative direction. An increased concentration of supporting electrolyte also shifted the wave to a more negative position. In all cases a continuous discharge began at about —1·3 V (v. S.C.E.). This discharge was so far removed from that of the potassium ions of the supporting electrolyte that it was attributed to the discharge of hydrogen. Since the initial reduction of the platinum complexes corresponded to a two-electron change, it can be represented by reduction to a tetrammine ion. It is postulated that at higher applied potentials (namely, —1·3 V v. S.C.E.) the reduction proceeded further, producing platinum metal. This platinum metal would be in an active state, insoluble in mercury, and being on the surface, would lower the overvoltage of hydrogen leading to its discharge at a more positive potential than on a pure mercury surface. This view was supported by the fact that gas bubbles were observed at the dropping electrode when a voltage greater than —1·3 V was applied to the electrode for some time. When ammonia was added to the supporting electrolyte, a wave, without an inflexion, and corresponding to an irreversible two-electron reduction, was obtained at more negative potentials. The bivalent tetrammineplatinum(II) and bis(ethylenediamine)platinum(II) ions also gave polarograms showing the continuous discharge of hydrogen.

Smoke agent for sterilizing refrigeration house and processing workshop and its prepn process

Abstract: The smoke agent for sterilizing refrigeration house and processing workshop consists of disinfectant, oxidant, inflammable carrier, fire retardant, moisture preventing agent and coloring agent. The disinfectant is one or several kinds of trichloro isocyanuric acid and its sodium or potassium salt, dichloro isocyanuric acid and its sodium or potassium salt, tribromo isocyanuric acid and its sodium or potassium salt and dibromo isocyanuric acid and its sodium or potassium salt; the oxidant is one or several kinds of potassium permanganate, potassium chlorite, potassium nitrate and potassium nitrite; the inflammable carrier is flour, rice straw and corn stalk; the fire retardant is one or several kinds of ammonium chloride, sodium carbonate and sodium bicarbonate; the moisture preventing agent is white oil and the coloring agent phthalocyanine green. The present invention has high disinfecting effect, no harm to human body and less corrosion to metal, less production investment and simple production process.