48 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.

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.

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.

Disclosed embodiments relate to a wound dressing which can generate nitric oxide. The wound dressing may include a cover layer, an activator layer such as an acid providing layer and nitric oxide source layer, such as a nitrite providing layer. The activator layer may include acidic groups and may be hydrogel, xerogel, or other suitable material. The nitric oxide source layer may include a nitrite salt. Nitrite ions of the nitric oxide source layer may react with the acidic groups of the activating layer to generate nitric oxide. The activating layer may include a window at the center, and a central absorbent material may be positioned at the window. Various separating layers may also be incorporated into the dressing to control the interaction between activating layer and nitric oxide source layer.

The invention relates to high-sensitivity nitrite detection test paper and a preparation method thereof.The test paper comprises a detection base layer, the detection base layer contains a nitrite ion reaction substrate, the nitrite ion reaction substrate is red after making contact with nitrite ions, different nitrite ion concentrations are distinguished through different color gradations of the color, and the nitrite ion concentration is different from that of the nitrite ion reaction substrate. The detection base layer is soaked in a feed liquid and then is dried to obtain the high-sensitivity nitrite detection test paper, the feed liquid contains a nitrite ion reaction substrate and a pH regulator, and the nitrite ion reaction substrate is selected from one or more of aniline, p-toluidine, aminonaphthalene and Klehu acid. Compared with the prior art, the method provided by the invention has the characteristics of accurate concentration indication and high sensitivity, and especially when the nitrite concentration is low, the color gradation of different concentrations is clear.

Disclosed embodiments relate to a wound dressing which 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 hydrogel, xerogel, or other suitable material. The nitrite providing layer may include a mesh component embedded with a nitrite salt and an antioxidant / reducing agent such as sodium iso-ascorbate. Nitrite ions of the nitrite providing layer may react with the acidic groups of the activating layer to generate nitric oxide. Additionally, the wound dressing may be produced and stored so as to reduce degradation of the antioxidant / reducing agent and thereby enable stable nitric oxide generation.

A method for preparing a biphenol dianhydride composition, comprising heating a first solution, the first solution comprising a biphenol tetracarboxylic acid of 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 first solution is heated under conditions effective to provide a second solution, the second solution comprising: the corresponding biphenol dianhydride; 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 present invention provides a method for generating nitrite and / or nitrate ions from a nitrate ester and a method for detecting nitrate esters in a mixture by generating and detecting nitrite and / or nitrate ions.

Resin microparticles with reduced metallic and leached ion content and excellent dielectric properties are provided. Furthermore, a method for manufacturing such resin microparticles is provided. The resin microparticles of embodiments of the present invention have a total content of component A of less than 100 ppm as determined by inductively coupled plasma atomic emission spectrometry, a total content of leached ion component B of less than 100 ppm as determined by ion chromatography, and a dielectric loss tangent of 0.0050° or less at a frequency of 10 GHz. Component A includes Al, Ba, Ca, Cr, Cu, Fe, K, Mg, Mn, Na, P, S, Si, Sr, and Zn. Ionic component B includes fluoride ions, chloride ions, nitrite ions, bromide ions, nitrate ions, phosphate ions, and sulfate ions.

The utility model discloses a micro-nano electrochemical sensor for in-situ detection of nitrite and a detection system. The micro-nano electrochemical sensor is provided with a reference electrode, a counter electrode and a working electrode, the reference electrode is connected with the working electrode through a voltage measuring instrument and is used for measuring the potential of the working electrode relative to the reference electrode; the counter electrode is used for connecting a positive electrode of a polarization power supply; the working electrode is used for being connected with a negative electrode of a polarization power supply, the working electrode comprises a carbon substrate, a WO3 / WO3-x nano array layer is arranged on the surface of the carbon substrate, and a nitrite ion carrier is loaded on the WO3 / WO3-x nano array layer. The electrochemical sensor can be used for detecting nitrite ions in a water body, has the advantages of being convenient to operate, high in detection speed, low in detection limit, high in sensitivity and strong in anti-interference capability, and has a wide application prospect.

The invention provides a method for preparing urea through co-electrolysis of CO2 and nitrite ions, and belongs to the technical field of electrochemical preparation of urea. The method comprises the following steps: mixing cerous nitrate, water, propionic acid and ethylene glycol, carrying out a hydrothermal reaction, mixing a nano cerium oxide carrier, ethanol and a metal salt, carrying out rotary evaporation, sequentially drying and calcining the obtained precipitate, and carrying out a reduction reaction on the calcined product to obtain the catalyst, mixing a catalyst, absolute ethyl alcohol and a perfluorosulfonic acid resin solution, and coating the obtained suspension on carbon paper to obtain a working electrode; and placing the working electrode in the electrolyte, introducing CO2 gas, and carrying out an electrolytic reaction by adopting a three-electrode system to obtain the electrolyte containing urea. According to the method, the mesoporous cerium oxide carrier with a large specific surface area is loaded with copper-zinc bimetal or copper metal, and CO2 and NO2 <-> are coupled to generate urea by using a non-noble metal catalyst, so that high-value chemicals can be produced, and environmental problems can be relieved.

The invention discloses a UASB (Upflow Anaerobic Sludge Blanket) reactor device and method for improving the tolerance of anammox bacteria to nitrite ions aiming at high-ammonia-nitrogen industrial wastewater. The UASB reactor device comprises a UASB reactor main body, a water inlet bucket, a water outlet bucket, a NO2-gradient control system, a protective additive injection mechanism, an online feedback control system, a granular sludge grading separation mechanism and a pH micro-pulse auxiliary mechanism. NO2 <-> concentration fluctuation is simulated through pulse type water inflow, and mild stimulation on anammox granular sludge is achieved; and finally, rapidly increasing the NO2 <-> tolerance threshold value of the anammox granular sludge to 120-150mg / L or above by combining low-concentration EDTA chelating agent buffering impact, pH micro-pulse (with the amplitude of 0.2 unit) inducing acid-base adaptive enzyme expression, N2 gas flow monitoring and activity estimation, granular sludge grading separation accelerating survival of the fittest, and AI algorithm dynamic parameter adjustment, and finally, rapidly increasing the NO2 <-> tolerance threshold value of the anammox granular sludge to 120-150mg / L or above. An activated carbon particle carrier loaded with nano-iron is arranged in the UASB reactor main body and is used for adsorbing NO2-concentration fluctuation and assisting in improving the activity of NO2-reductase. The method is suitable for a pure anammox denitrification process of industrial wastewater with relatively large fluctuation of ammonia nitrogen and nitrite, and a stable operation basis is provided.

The disclosed embodiments relate to wound dressings capable of generating nitric oxide. The wound dressing may comprise a cover layer, an activating layer such as an acid-providing layer, and a nitrite-providing layer. The activating layer may comprise acidic groups and may be a hydrogel, xerogel, or other suitable material. The nitrite-providing layer may comprise mesh components embedded with antioxidants / reducing agents such as nitrite and sodium isoascorbate. Nitrite ions in the nitrite-providing layer may react with acidic groups in the activating layer to generate nitric oxide. Furthermore, the wound dressing may be manufactured and stored to reduce the degradation of antioxidants / reducing agents, thereby enabling stable nitric oxide production.

The invention relates to a method for detecting nitrite ions in a dilsulfon hydrochloride # imgabs0 # sustained release tablet, which comprises the following steps: leaching dilsulfon hydrochloride # imgabs1 # sustained release tablet powder to be detected by using an organic solvent, and then mixing with deionized water for extraction; after standing and clarifying, dropwise adding a silver nitrate test solution, and carrying out centrifugal separation to obtain precipitates, insoluble substances and supernate; washing the precipitates and insoluble substances with deionized water for multiple times, and centrifugally collecting washing liquid; combining the rinsing solution with the supernate, filtering with a water-based filter membrane to remove impurities, and fixing the volume to obtain a test solution; preparing reference substance solutions of a series of concentration gradients of nitrite ions; and detecting by using ion chromatography, and calculating the content of nitrite ions in the diltim hydrochloride # imgabs2 # sustained release tablet to be detected by using an external standard method. According to the method, the to-be-detected sample is fully extracted and then subjected to ion chromatography detection, the trace nitrite ions in the diltim hydrochloride # imgabs3 # sustained release tablet can be effectively detected, the accuracy is high, and the specificity is high.

This invention discloses a sensitive fluorescence sensor for detecting NO in ham sausage samples. 2‑ The method belongs to the field of analytical detection. The steps are as follows: 1. Prepare carbon dots using citric acid and cauline as precursors; 2. NO in the carbon dots 2‑ The addition of [a specific substance] will quench fluorescence through dynamic quenching and diazotization effects, based on which NO [a specific substance] can be constructed. 2‑ Standard curves of NO concentration and fluorescence quenching degree were obtained, and the NO concentration in ham sausage samples was determined. 2‑ The concentration of NO. This invention is the first to use a sensitive fluorescence sensor to sequentially detect the concentration of NO. 2‑ It enables quantitative detection of substances and is simple, safe, and efficient, making it suitable for routine analysis.

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 invention relates to the technical field of ion detection, and discloses a green emission carbonized polymer dot, a preparation method and a nitrite ion detection method based on the green emission carbonized polymer dot. The detection method comprises the following steps: taking a g-CPDs working solution, adding solutions containing nitrite ions with different concentrations, incubating and observing the fluorescence color change of the solutions, determining the fluorescence intensity F of the solution after the reaction, and simultaneously determining the fluorescence intensity F0 of a blank working solution; establishing a standard curve for detecting the nitrite ions according to the relationship between the fluorescence intensity of the g-CPDs before and after the reaction and the change value of the concentration of the nitrite ions; the method comprises the following steps: taking a g-CPDs working solution, adding a to-be-detected solution containing nitrite ions, incubating, observing the fluorescence color change of the solution, and measuring the fluorescence intensity of the solution; and calculating the concentration of the nitrite ions in the to-be-detected liquid according to the linear relationship between F0 / F and the concentration of the nitrite ions. The detection method is sensitive and anti-interference, and is suitable for food and environmental water sample detection.

A wound dressing comprising a cover layer 16200, an acid providing layer 16400 and a nitrite providing layer 16600. The acid providing layer comprises acidic groups and may be hydrogel or Xerogel. The

A detection apparatus detects at least one chemical species in the sweat of a human or animal subject, the at least one chemical species being selected from the group consisting of nitrogen oxide NO, nitrite ion NO2− and hydrogen peroxide H2O2. The apparatus has a collection element that is intended to be positioned in an investigation zone of an epidermis of the subject, and a detection device has at least one fluid circuit that is coupled to the collection element in order to direct at least one flow of sweat from the investigation zone and an electrochemical sensor having electrodes that are arranged in the fluid circuit, the electrochemical sensor being configured to produce a signal that represents a concentration of the at least one chemical species in the flow of sweat and a signal that represents a flow speed of the flow of sweat.

An electrochemical sensitive electrode for detecting nitrite, a preparation method and its application belong to the field of electrochemical sensing technology. First, a carbon cloth is soaked in a strong acid mixed solution for a certain period of time for pretreatment and then cleaned; secondly, a copper source, a cerium source and a sodium salt are dissolved in deionized water in a certain proportion to serve as an electroplating solution; then the pretreated carbon cloth is used as a working electrode, a platinum sheet is used as a counter electrode, and a saturated calomel electrode is used as a reference electrode, and cyclic voltammetry is used for electroplating to obtain a carbon cloth-loaded cerium ion (III)-doped copper nanoparticle sensitive electrode; and the electrode is used as a working electrode for electrochemical detection of nitrite ions. The sensitive electrode prepared by the present invention has good sensitivity to nitrite ions within a certain concentration range, can realize sensitive, accurate and rapid detection of nitrite ions, and has a low detection limit, a wide linear range, high sensitivity and excellent stability and repeatability.