24 results about "Ph buffering" patented technology

The invention discloses a selective exchange film sealing concentrated solution based on layered double hydroxides. The selective exchange film sealing concentrated solution comprises divalent metal ions, a corrosion inhibitor, a pH buffering agent and a wetting agent. The invention also discloses a preparation method and application of the compound. The closed thin film obtained based on the layered double-metal hydroxide selective exchange thin film closed concentrated solution has excellent compactness, double protection on the aluminum alloy anode oxide film is achieved through selective exchange of interlayer anions of the closed thin film, and the corrosion resistance of the aluminum alloy anode oxide film is improved and enhanced; and on the premise that the aluminum alloy anode oxide film is protected from being corroded, the alkali resistance of the aluminum alloy anode oxide film is improved and enhanced, and the color fixing performance of the dye is achieved.

[Problem] To provide a base material and a method for adsorbing and immobilizing carbon dioxide using a base material that make it possible to semi-permanently adsorb and immobilize carbon dioxide in a base material in soil without using heat energy at all and solely by natural forces. [Solution] Provided is a base material 10 which is buried in soil and is used as a filler or a backfilling material for suppressing clogging. The base material 10 comprises: a hard aggregate body 20; a wet coating layer 30 which covers the surface of the aggregate body 20 and is composed of a naturally derived wetting substance 31 and an adhesion auxiliary material 32, the wetting substance 31 having an acidic functional group having at least a function of adsorbing and immobilizing carbon dioxide, a function of capturing an SS material, and a pH buffering action, and the adhesion auxiliary material 32 exhibiting viscosity when wetted and adhering the wetting substance 31 to the surface of the aggregate body 20; and a regenerated fine powder 33 of concrete that is a carbon dioxide carrier adhered to the surface of the aggregate body 20 or the wet coating layer 30.

The invention belongs to the technical field of coal mine machinery lubrication and hydraulic transmission, and discloses an environment-friendly total-synthesis concentrated solution for a hydraulic support and a preparation method of the concentrated solution. The biological sensing microcapsule corrosion inhibitor is characterized by comprising 0.5%-3.0% of a biological sensing microcapsule, 8.0%-15.0% of a main corrosion inhibitor, 2.0%-6.0% of an auxiliary corrosion inhibitor, 4.0%-10.0% of a water-soluble lubricant, 0.05%-0.2% of an anti-foaming agent, 1.0%-3.0% of a pH buffering agent and deionized water. Wherein the biological sensing microcapsule has a core-shell-shell structure, is integrated with electroactive microorganisms, an electron mediator carrier and a corrosion inhibition precursor release layer, and can trigger targeted release of benzotriazole derivatives when the pH value of a local corrosion microarea is less than or equal to 5.5. The corrosion inhibitor has excellent corrosion protection performance and environment-friendly characteristics, effectively overcomes the problem of inactivation of microorganisms under severe hydraulic working conditions through a microcapsule encapsulation strategy, realizes accurate matching of corrosion signal in-situ sensing and corrosion inhibition response, remarkably improves the anti-rust performance under high-shear and wide-temperature-range working conditions, and has wide application prospects. And meanwhile, the requirements of environmental protection and sealing material compatibility are met.

The invention relates to the technical field of freeze-dried powder injections, in particular to a polypeptide conjugate fluorescent developer preparation composition as well as a preparation method and application thereof. The polypeptide conjugate fluorescence imaging agent preparation composition is prepared from the following raw materials: a combination of a polypeptide conjugate fluorescence imaging agent raw material medicine, an excipient and a pH buffering agent, and at least one of a solubilizer and a chelating agent is included or not included. By improving the formula and the process of the freeze-dried powder injection, the problems that a polypeptide conjugate fluorescence imaging agent is insoluble and poor in stability are solved, and the formability, the resolubility and the stability are remarkably improved.

The invention discloses a method for inhibiting leaching of impurity aluminum ions in ionic rare earth ore, and belongs to the technical field of rare earth ore mining. The method comprises the steps that S1, an ore leaching agent is prepared according to the content of rare earth in an ore body; s2, a buffering agent is added into the mixture obtained in the step S1, and a composite ore leaching agent is prepared; s3, the composite ore leaching agent in the step S2 is added into an ore body for ore leaching; s4, preparing a buffer solution with the same pH buffer capacity as the composite ore leaching agent by using the buffer agent in the step S2; s5, after the composite ore leaching agent in the step S2 is completely added, the buffer solution in the step S4 is continuously added into the ore body until ore leaching is completed; according to the method, the composite ore leaching agent containing the specific buffering agent is prepared, and the pH value of leaching liquid in the ore leaching process is stably controlled within the range of 4.8-5.4; under the pH condition, the aluminum ions can form aluminum hydroxide precipitate colloid and are adsorbed in the ore body, and the rare earth ions still can stably exist in the leaching solution, so that the in-situ separation of the rare earth and the aluminum ions in the ore leaching stage is realized.

The utility model discloses equipment for preparing hypochlorous acid based on an ion exchange method, which relates to the technical field of hypochlorous acid preparation equipment and comprises a water inlet part, and the liquid inlet end of the water inlet part is connected with an external water supply pipeline; the liquid inlet end of the liquid injection part is connected with the water inlet part; the liquid inlet end of the ion exchange part is connected with the liquid injection part, and the liquid outlet end of the ion exchange part is connected with the hypochlorous acid using terminal through an external liquid conveying pipeline; the pipe diameter of the use terminal is greater than or equal to that of the liquid injection part; the controller is electrically connected with electrical elements in the water inlet part and the liquid injection part; according to the device, high-concentration hypochlorous acid can be prepared, the liquid outlet amount is large, and the weakly acidic cation exchange inner core has a good pH buffering function, so that the potential safety hazard of chlorine overflow does not exist.

The invention discloses an efficient defluorination agent as well as a production method and equipment thereof, and relates to the technical field of fluorine-containing wastewater treatment. The efficient defluorination agent disclosed by the invention is prepared from HEDTA (Hydroxyethylene Diamine Tetraacetic Acid), DTPA (Diethylene Triamine Pentacetate Acid), Fe2 (SO4) 3, FeCl3, NaHCO3, NaH2PO4, Fe-MOFs (Metal-Organic Frameworks), Zn-MOFs (Zn-Metal-Organic Frameworks), propylene glycol The fluorine removal agent disclosed by the invention can efficiently remove fluorine ions in water through a plurality of action mechanisms such as stable chelation, fluorine removal by precipitation, catalytic oxidation, fluorine removal by adsorption, pH buffer adjustment and the like; the microchannel reactor is adopted for continuous production, so that the uniformity and the stability of the medicament are improved, and the defluorination effect is ensured; the defluorination agent is suitable for defluorination treatment of drinking water, industrial wastewater and underground water; after low-fluorine and medium-fluorine water treatment, the fluorine ion concentration is reduced to below 1mg / L, and the water quality recovery standard of drinking water and underground water is met; and less sludge is generated in the defluorination process.

The invention discloses a cyanide-free Au-Sn electroplating solution and application, and belongs to the technical field of electroplating, the electroplating solution is composed of a gold source, a tin source, a gold complexing agent, a tin complexing agent, an additive and a pH buffering agent; the gold source is gold mercaptosulfonate; the tin complexing agent is mercaptoacetic acid and salt thereof; and the pH value of the cyanide-free Au-Sn electroplating solution is 3 to 11. The electroplating liquid provided by the invention does not contain extremely toxic substances, has relatively high storage stability and electroplating stability, and still keeps a clear and transparent state even under high and low temperature change, illumination, long-time storage or long-time electroplating, and an Au-Sn alloy plated part with uniform and stable components and high reproducibility is obtained in long-time storage or long-time electroplating; therefore, the performance of an Au-Sn alloy plating piece obtained through electroplating is effectively guaranteed, the performance of the electroplating solution is excellent, and application to the packaging technology of microelectronic or optoelectronic devices is facilitated.

The invention discloses a polishing solution for chemically mechanical polishing of a silicon carbide liner tube and a preparation method and application of the polishing solution. The polishing solution comprises the following raw material components in percentage by mass: 0.1-3% of silicon oxide; 1-5% of cerium oxide; 0.5-5% of an oxidizing agent; 0.2-2% of a surface modifier; 0.0001 to 0.01% of a surfactant; 0.2-2% of a pH buffer agent; and the balance of water. The silicon oxide particles and the surface modifier are added into the cerium oxide polishing solution of the alkaline system, the pH value in the polishing process is controlled through the pH buffering agent, irreversible agglomeration of grinding materials is avoided, and therefore it is guaranteed that the polishing solution has the good polishing effect while having the good polishing rate, the whole polishing solution system is stable, and the polishing effect is good. And aggregation and sedimentation are not easy.

The purpose of the present invention is to provide an electric nickel plating solution in which a ceramic element body does not readily erode. An electroplating solution according to the present invention comprises: a nickel ion supply source; a sulfonic acid represented by formula 1: R-SO3H (R is an alkyl group or hydroxyalkyl group having 1-5 carbon atoms), or a salt thereof; sodium hydroxide; and a pH buffering agent.

The application discloses a method for inhibiting leaching of impurity aluminum ions in ionic rare earth ore, and belongs to the technical field of rare earth ore mining. S1, according to the rare earth content in the ore body, a leaching agent is configured; S2, a buffer is added to the step S1 to configure a composite leaching agent; S3, the composite leaching agent in the step S2 is added to the ore body for leaching; S4, the buffer in the step S2 is configured into a buffer solution with the same pH buffering capacity as the composite leaching agent; S5, after the composite leaching agent in the step S2 is added completely, the buffer solution in the step S4 is continuously added to the ore body until the leaching is completed; the composite leaching agent containing a specific buffer is configured, the pH value of the leaching solution in the leaching process is stably controlled within the range from 4.8 to 5.4; under the pH condition, aluminum ions can form aluminum hydroxide precipitate colloid and are adsorbed in the ore body, while rare earth ions can still stably exist in the leaching solution, so that in-situ separation of the rare earth and the aluminum ions in the leaching stage is realized.

The invention discloses a time and temperature indicator based on ferrous-tannic acid and application of the time and temperature indicator in food freshness monitoring, the time and temperature indicator (TTI) comprises a body and a time and temperature indicator body arranged in the body, the time and temperature indicator body comprises a pH buffering agent, ferrite and tannic acid, the molar ratio of the ferrite to the tannic acid is (2-8): (1-5), and the pH of the pH buffering agent is 1-7. The method can be widely matched with the decay kinetics of different food systems, and breaks through the key bottleneck that the applicability of the traditional TTI is limited.

To provide a method for evaluating the pH of steelmaking slag for marine use, which allows for simpler, more inexpensive, and more accurate evaluation of the pH of steelmaking slag even in brackish water areas where the pH buffering effect is weak.SOLUTION: The pH of seawater in which steelmaking slag for marine use is immersed is estimated using the following regression equation (1) based on the pH measured by immersing the steelmaking slag in purified water and an index indicating the pH buffering capacity of seawater. Regression equation (1): Y=(α1*E+α2)*X+(β1*E+β2). In equation (1), Y is the pH of seawater, X is the pH measured by immersing steelmaking slag in purified water, E is an index indicating the pH buffering capacity of seawater, and α1, α2, β1, and β2 are constants determined by regression analysis.SELECTED DRAWING: Figure 4

The present application relates to the technical field of agricultural product quality and safety detection and element form analysis, and particularly relates to an LC-ICP-MS / MS method for detecting selenocysteine. The present application provides an LC-ICP-MS / MS method for detecting selenocysteine, wherein the sample to be detected is mixed with iodine acetamide solution and buffer extraction solution for enzymolysis to obtain an enzymolysis solution; the final concentration of iodine acetamide in the mixed solution is 0.02-0.10 mmol / L; the purified solution is injected into a liquid chromatography system for high performance liquid chromatography separation, a solution without ion pair reagent, with pH buffering capacity and excellent ICP-MS compatibility is used as a mobile phase, and an anion exchange chromatographic column is used as a chromatographic column; the chromatographic effluent is introduced into ICP-MS / MS for detection, CH4 is used as a reaction gas, a detection method with a recovery rate of greater than or equal to 90% and no residual interference is constructed, and a new paradigm is provided for the accurate analysis of unstable selenium forms.

The invention discloses a neutral bright tinning electroplating solution and a preparation method and application thereof. The electroplating solution is composed of tin salt, a tin complexing agent, a brightening agent, a dispersing agent and a pH buffering agent. The molar concentration of the tin salt is 0.10 mol / L to 0.40 mol / L; the tin complexing agent is mercaptoacetic acid and salt thereof; the brightener is a flavonol substance; the dispersing agent is a nonylphenol polyoxyethylene ether substance; and the pH value of the neutral bright tinning electroplating solution is 6.0-8.0. The electroplating solution provided by the invention has the advantages of higher stability, longer service life, smaller hydrogen evolution phenomenon, simple components and easiness in management, and the dispersing capacity and covering capacity of the electroplating solution are improved through the synergistic effect of the components, so that the performance of a tin-plated part prepared by electroplating is effectively ensured, and the tin-plated part is good in associativity, low in porosity, uniform, compact and bright in appearance; and the application in the electronic component or mechanical manufacturing technology is facilitated.

To provide a base material and a method for adsorbing and fixing carbon dioxide using the base material which can semi-permanently adsorb and fix carbon dioxide onto the base material in the soil without using any thermal energy at all and solely through natural forces.SOLUTION: A base material 10 buried in the soil and used as a filler or backfill material to prevent clogging, the base material comprising a hard aggregate body 20, a wet coating layer 30 that coats the surface of the aggregate body 20 and is configured by a naturally derived wetting substance 31 having a function of adsorbing and fixing carbon dioxide, a function of capturing SS substances and an acidic functional group having at least a pH buffering action, and an adhesion promoting agent 32 exhibiting viscosity when wet and causing the wetting substance 31 to adhere to the surface of the aggregate body 20, and recycled concrete fine powder 33 that is adhered to the surface of the aggregate body 20 or the wet coating layer 30 and is a carrier for carbon dioxide.SELECTED DRAWING: Figure 4

In an embodiment of the present invention, there is provided a reagent layer comprising a polymer containing a proton accepting group in a repeating unit and having a pH buffering ability, and an oxidoreductase that oxidizes or dehydrogenates an analyte.

In an embodiment of the present invention, there is provided a reagent layer comprising a polymer containing a proton accepting group in a repeating unit and having a pH buffering ability, and an oxidoreductase that oxidizes or dehydrogenates an analyte.

This method for immunologically detecting a substance being tested for in a sample includes a labeling step for forming a complex of the substance being tested for and a label containing a first probe molecule capable of binding to the substance being tested for and a labeling substance, in the presence of: at least one selected from imidazole and derivatives thereof; a pH buffering agent; and a polyvalent metal ion.

The invention discloses a screw with a corrosion-resistant film layer and a preparation method of the screw. The screw with the corrosion-resistant film layer comprises an iron-based screw body and the corrosion-resistant film layer wrapping the surface of the iron-based screw body. The corrosion-resistant film layer is prepared from the following components in percentage by weight: 8 to 15 percent of phytic acid-copper complex, 5 to 12 percent of molybdate radical intercalation corrosion inhibitor, 3 to 7 percent of chestnut tannin, 0.5 to 1 percent of silane coupling agent, 0.2 to 0.5 percent of tea saponin, 2 to 5 percent of pH buffering agent, 0.5 to 1 percent of sodium polyacrylate, 1.5 to 3.5 percent of nano SiO2 dispersion liquid and the balance of water. And the corrosion-resistant film layer improves the corrosion resistance of the screw rod, and is good in film-forming property and high in adhesive force.

The invention discloses a polyanion gel electrolyte, a preparation method thereof and a zinc battery, and the preparation method comprises the following steps: S1, dissolving a nonionic hydrophilic monomer and a zinc salt in water, and uniformly dispersing to obtain a solution A; s2, adding a sulfonic group-containing monomer into the solution A, and uniformly dispersing to obtain a solution B; s3, respectively adding a pH buffer agent and a catalyst into the solution B, and uniformly dispersing to obtain a solution C; s4, adding an initiator and a cross-linking agent into the solution C, and heating and polymerizing to obtain a polyanion gel electrolyte with a pH buffering function; and the pH buffering agent adopts choline glycerophosphate. The polyanion gel electrolyte can synchronously buffer the pH fluctuation of a zinc electrode interface, maintain a stable electrochemical environment, effectively regulate and control the content of free water, reduce side reactions, induce uniform deposition of zinc ions and strongly inhibit dendritic crystal growth and corrosion reaction.

The invention provides a deplating solution and an electrolytic deplating method, and the deplating solution comprises 1-15 wt% of an organic salt, 0.1-5 wt% of a chelating agent, 1-15 wt% of a pH buffer agent, 0.1-3 wt% of a wetting agent and 60-95 wt% of deionized water on the basis of the total mass of the deplating solution; wherein the organic salt is organic acid sodium salt and / or organic acid potassium salt. The organic salt, the chelating agent, the pH buffering agent, the wetting agent and the deionized water are efficiently compounded, so that a chromium-containing film layer on the surface of a metal base material can be efficiently removed, the deplating effect is good, and safety and environment friendliness are achieved.

Provided is a treatment liquid for treating a semiconductor wafer in a semiconductor forming process, the treatment liquid containing (A) a hypobromite ion, (B) a pH buffer, and (C) an onium ion represented by formula (1):(wherein R1, R2, R3, and R4 each independently denote an alkyl group having carbon number from 1 to 25,)

The invention relates to the technical field of safe disposal of dangerous solid wastes, in particular to a method for stabilizing beryllium-containing waste residues by using a pH buffer mechanism, which comprises the following steps: using minerals with a pH alkaline buffer effect or a mixture of minerals and solid wastes as a blocky pH alkaline buffer agent raw material; crushing and grinding the blocky pH alkaline buffering agent raw material, then carrying out screening and grading treatment, and selecting particles with the particle size of less than or equal to 1mm as the pH alkaline buffering agent; the method comprises the following steps: uniformly mixing a pH alkaline buffer agent with beryllium-containing waste residues according to a weight ratio of 1: 5-50: 1 to obtain a mixture capable of fixing soluble beryllium ions in the beryllium-containing waste residues into Be (OH) 2 beryllium indissolvable substances after meeting water; and the mixture is subjected to landfill. The method solves the problems of high energy consumption, high secondary pollution risk and insufficient long-term stability in the existing beryllium-containing waste residue harmless treatment technology.