63 results about "Nitrite ion" patented technology

A nitrogen-based gas discharge device 100 according to one aspect of the present invention includes: a green compact 111 containing a powder of a layered double hydroxide in which nitrite ions (NO2 -) are included between layers, and a powder of a reducing agent or a precursor thereof; and a gas discharge module 110 disposed so as to cover the green compact 111 and composed at least of a film 112 that is waterproof and has water vapor permeability and gas permeability. The solubility of the reducing agent in water at room temperature is 1 g / 30 mL or more and the pH of a 0.1 (w / v)% aqueous solution of the reducing agent at room temperature is 5.1 or less. The nitrogen-based gas discharge device 100 may also include a water-containing body 120 for supplying water vapor to the nitrogen-based gas discharge module 110.

Provided is an analysis device and an analysis method which, while solving the problem of column plugging, carries out continuous analysis of nitrogen in a sample without use of cadmium that causes environmental pollution. The problem is solved by an analysis method including: a sample introduction step of introducing a sample into a tube; a reduction step of reducing, to ammonium ions, nitrate ions and nitrite ions in the sample being transferred in the tube; and an analysis step of analyzing the ammonium ions in the sample which have been generated in the reduction step. In the reduction step, the nitrate ions and the nitrite ions in the sample are reduced by transferring the sample in a hollow tube in which at least an inner wall surface is made of zinc.

The invention discloses a method for separating rhenium from a rhenium-rich solution containing molybdenum and tungsten. The method comprises the following steps: extracting a rhenium-rich raw material solution containing ReO4 <-> and impurity ions by using an extraction agent containing hydrophobic ionic liquid to obtain an organic extraction phase containing ReO4 <-> and a raffinate phase containing the impurity ions; wherein the solvent of the raw material solution is water, and the impurity ions comprise one or two of MoO4 < 2-> and WO4 < 2->; the hydrophobic ionic liquid is composed of positive ions and negative ions, the anions are selected from one or more of halide ions, borate anions, carboxylate anions, carbonate anions, nitrate ions, nitrite ions, sulfate anions, sulfite anions, sulfonate anions, phosphate anions, phosphite anions, thiocyanate anions and amino acid ions. The method is high in separation efficiency, simple in technological process, easy to amplify, small in extraction agent loss, capable of being recycled and suitable for industrial production.

A secondary battery, a preparation method therefor, and an electrical device. The secondary battery comprises an electrode sheet. The electrode sheet comprises a current collector, an active material layer, and a base coating. The active material layer is located on at least one surface of the current collector. The base coating is located between the current collector and the active material layer. The base coating contains an additive, and anions of the additive comprise at least one of nitrate ions and nitrite ions. In the electrode sheet, the base coating is arranged between the current collector and the active material layer. The anions in the base coating comprise nitrate ions and nitrite ions, enabling the additive to gradually dissolve and diffuse into an electrolyte. In this way, the nitrate and nitrite undergo a reduction reaction, and the reduction product thereof becomes part of an SEI film to enable repair of the SEI film, thereby achieving thin, stable, and compact SEI films and significantly improving the cycle life of the battery.

A gas delivery device includes a nitric oxide generating system. The system has a medium including a nitrite ion source. The working electrode is in contact with the medium. The Cu (II)-ligand complex is in contact with the working electrode. The reference / counter electrode, or the reference electrode and the counter electrode, is in contact with the medium and separated from the working electrode. An inlet conduit is used to deliver nitrogen to the medium and an outlet conduit is used to deliver nitrogen and a nitric oxide stream from the medium. An inspiratory gas conduit is operatively connected to the outlet conduit to introduce the oxygen-containing gas and form an output gas flow of the gas delivery device.

A thermochemical engine that includes a reaction chamber having a nitrite source inlet, an ammonium source inlet, and a gas outlet, and a gas-driven energy transducer coupled to the reaction chamber such that a gas produced in the reaction chamber moves the gas-driven energy transducer in a process of exiting the reaction chamber via the gas outlet. The thermochemical engine is configured to produce the gas under pressure by reacting in the reaction chamber a nitrite source comprising a nitrite ion and an ammonium source comprising an ammonium ion in the presence of water at a reaction temperature of 50 to 150° C.

This invention relates to a method and system for measuring nitrogen oxide emissions from soil in the field using an extraction-absorption method, belonging to the field of environmental monitoring technology. A soil sampling unit is sealed and placed on the surface of the soil to be tested. Gas is extracted from the soil sampling unit by a power unit, causing outside air to replace the gas inside the soil sampling unit, forming an airflow flowing across the surface of the soil. The airflow is sequentially guided to a first absorption bottle, an oxidation bottle, and a second absorption bottle connected in series. The concentration of nitrite ions in the first and second absorption solutions is measured respectively. Based on the measured nitrite ion concentration, sampling flow rate, sampling time, and the area of ​​the soil covered by the soil sampling unit, the nitrogen oxide emission flux is calculated. This invention achieves stable, efficient, and low-cost offline quantitative measurement of nitrogen oxide emissions from soil in the field, providing reliable technical support for research on land-atmosphere exchange, soil nitrogen cycle, and atmospheric pollution source tracing.

The invention provides a visual colorimetric sensor, a preparation method thereof and a method for detecting nitrite, the visual colorimetric sensor comprises a substrate and a color developing functional layer, the color developing functional layer is loaded on the substrate through a hydrogen bond, the substrate comprises a cellulose membrane, and the color developing functional layer comprises a TMB material. According to the invention, the cellulose membrane is used as the substrate and the hydrogen bond is used for loading the TMB to form the color developing functional layer, so that the contact area between the TMB and nitrite ions is increased due to the porous characteristic of the cellulose membrane, and the TMB is reduced in loss due to stable loading, so that the reaction is more sufficient to realize high-sensitivity detection; by means of the specific chromogenic reaction of TMB and nitrite ions and the extremely strong anti-interference ability, it is ensured that detection is accurate and high in selectivity in a complex sample, meanwhile, color change is visual and distinguishable, visual detection easy and convenient to operate is achieved, and finally the detection requirements of the World Health Organization and the national standard for nitrite in food are met.

To provide a wire electric discharge machine that can extend a service life of a filter 32, even when subjecting an aluminum-based material to electric discharge machining.SOLUTION: A wire electric discharge machine (10) according to an embodiment in the disclosure subjects an aluminum-based material to electric discharge machining. A processing liquid used for electric discharge machining in the wire electric discharge machine includes one or more cations selected from potassium ions, calcium ions, sodium ions, and magnesium ions, and one or more anions selected from sulfate ions, sulfite ions, disulfite ions, hydrogen sulfite ions, hydroxide ions, nitrate ions, and nitrite ions.SELECTED DRAWING: Figure 1

The invention discloses a nickel cobalt phosphide electrochemical low-reduction-potential sensitive electrode based on a nitrite catalytic reduction mechanism, and a preparation method and application thereof, and belongs to the technical field of electrochemical sensing. The preparation method comprises the following steps: firstly, pretreating carbon cloth by adopting a strong acid mixed solution to enhance the hydrophilicity of the carbon cloth, cleaning for later use, and then dissolving a cobalt source, a nickel source and phosphate in deionized water according to a specific proportion to prepare an electro-deposition solution; and then, taking the pretreated carbon cloth as a working electrode, and performing electrodeposition on the surface of the working electrode by adopting a chronoamperometry to form a cobalt nickel phosphide nanoflower structure, so as to prepare the sensitive electrode. When the electrode is applied to nitrite detection, the electrode shows excellent electrocatalytic reduction activity in a system formed by a mercury / mercuric oxide reference electrode and a platinum counter electrode. The electrode prepared by the invention can realize high-sensitivity, rapid and low-potential detection of nitrite ions, and effectively solves the problems of insufficient sensitivity, high oxidation overpotential, poor selectivity and the like of an electrochemical nitrite sensor.

The present invention provides a continuous analysis device and an analysis method for nitrogen in a sample that do not use cadmium, which is a cause of environmental pollution, and solves the problem of column clogging. This is solved by an analysis method including a sample introduction step of introducing a sample into a pipeline, a reduction step of reducing nitrate ions and nitrite ions in the sample transferred in the pipeline to ammonium ions, and an analysis step of analyzing ammonium ions in the sample generated in the reduction step. In the reduction step, the sample is transferred through a hollow tube made of zinc at least on the inner wall surface to reduce nitrate ions and nitrite ions in the sample.

Provided are resin fine particles that include reduced amounts of a metal component and an eluted ion component and that have excellent dielectric characteristics. Also provided is a method for producing such resin particles.　Resin fine particles according to an embodiment of the present invention have a total content of components A of 100 ppm or less as measured by inductively coupled plasma light emission analysis, a total amount of eluted ion components B of 100 ppm or less as measured by an ion chromatograph, and a dielectric loss tangent at a frequency of 10 GHz of 0.0050 or less. Component A is Al, Ba, Ca, Cr, Cu, Fe, K, Mg, Mn, Na, P, S, Si, Sr, and Zn. Ion component B is fluoride ions, chloride ions, nitrite ions, bromide ions, nitrate ions, phosphate ions, and sulfate ions.

The disclosed embodiments relate to a wound dressing that can generate nitric oxide. The wound dressing may include: a cover layer; an activator layer, such as an acid providing layer; and a nitrite providing layer. The activator layer may include acidic groups and may be a hydrogel, xerogel, or other suitable material. The nitrite providing layer may include a mesh component embedded with nitrite and an antioxidant / reducing agent, such as sodium erythorbate. The nitrite ions of the nitrite providing layer can react with the acidic groups of the activation layer to generate nitric oxide. In addition, wound dressings can be produced and stored such that degradation of antioxidants / reductants is reduced and thus stable nitric oxide production is achieved.

A method of making a biphenol dianhydride composition includes heating a first solution including a biphenol tetraacid of the formula (I) wherein Ra, Rb, p and q are as defined herein; at least one of sodium ions, potassium ions, calcium ions, zinc ions, aluminum ions, iron ions, phosphate ions, sulfate ions, chloride ions, nitrate ions, and nitrite ions; and a non-halogenated solvent. The N first solution is heated under conditions effective to provide a second solution including the corresponding biphenol dianhydride, the at least one of sodium ions, potassium ions, calcium ions, zinc ions, aluminum ions, iron ions, phosphate ions, sulfate ions, chloride ions, nitrate ions, and nitrite ions, and the non-halogenated solvent.

A wire electric discharge machining device according to an aspect of the present disclosure is for electric discharge machining of an aluminum-based material, wherein a machining fluid used in electric discharge machining contains at least one kind of cation from among potassium ions, calcium ions, sodium ions and magnesium ions and at least one kind of anion from among sulfate ions, sulfite ions, disulfite ions, hydrogen sulfite ions, hydroxide ions, nitrate ions and nitrite ions.