41 results about "PH indicator" patented technology

According to an aspect of the present invention, there is provided there is provided a dog pee pad, comprising: two or more layers; pulp dispersed between the layers; a pH indicator; and a polyethylene bottom. According to another aspect of the present invention, there is provided a method, comprising: of assessing the health of a dog, comprising: training a dog to pee on a pee pad; obtaining a sample of dog urine on the pee pad; waiting for the reaction of the sample with compounds in the pee pad; comparing the color indicated by the reaction with a color scale; and correlating the color scale to a chart of indicated health conditions.

The invention belongs to the technical field of flue gas desulfurization, and particularly relates to a preparation method of an acid-base indicator modified dry-process alkaline absorbent and application of the acid-base indicator modified dry-process alkaline absorbent in dry-process desulfurization. In surface modification, an alkaline absorbent particle is used as an inner core, an alkaline absorbent and an absolute ethyl alcohol solution of an acid-base indicator (such as phenolphthalein and sulfophenolphthalein) are uniformly mixed, and after absolute ethyl alcohol is completely volatilized, a coating layer is formed on the surface layer of the particle. Through interaction of the modifier and the alkaline desulfurizer, modified desulfurizer particles are uniform in color such as purple red or blue. The modified dry desulfurization agent provided by the invention can significantly improve the SO2 capture capability, and experiments verify that under the same conditions, the SO2 absorption amount of the acid-base indicator modified sodium carbonate is 3-6 times that of unmodified sodium carbonate. In addition, the method is used for other dry alkaline desulfurizers (including but not limited to sodium bicarbonate, calcium hydroxide, calcium oxide, magnesium hydroxide and the like), and has the potential of improving the desulfurization performance under proper conditions.

Disclosed herein are devices, wound dressings and methods for determining the pH of fluid or a wound exudate at a wound. Example devices include a device comprising a surface configured to contact the fluid or wound and a pH indicator covalently bound thereto or applied to the surface, wherein the pH indicator has a first colour prior to contact with the fluid or the wound exudate and changes colour as a function of the pH of the fluid or wound exudate. Example devices include a device which indicates wound exudate loading within a wound dressing and wound dressing comprising an absorbent layer and a moisture indicator which indicates would exudate loading within the dressing, wherein the visibility of the moisture indictor changes as a result of a physical transformation of a first material within the dressing. Systems, devices, and methods are provided for monitoring wound status and progression by measuring pH levels indicated by pH-sensitive wound dressings. In some implementations, a wound is monitored by capturing an image of the pH-sensitive wound dressing and processing the captured image to determine the color of a pH indicator included on the wound dressing. The color of the indicator is determined in terms of RGB values from the image, and a pH value for the wound dressing is calculated from the dressing RGB values. The calculated pH value is then relayed to a user to be used as an indicator of wound status or health.

The invention provides a method for monitoring the acidity of water on line, which comprises the following steps: adding a water sample and a titration indicator into a titration cell, uniformly mixing, measuring the absorbance A background of the water sample mixed with the titration indicator at the wavelength lambda, and taking the absorbance A background as an absorbance background value; titrating the water sample by using a NaOH standard solution as a titrant, and measuring the absorbance A of the water sample at the wavelength lambda in the titration process; taking the moment when the absorbance A is greater than or equal to the absorbance threshold A in the titration process as a titration end point, and obtaining the titration volume of the NaOH standard solution at the titration end point; obtaining the acidity of the water sample based on the titration volume. The method adopts an acid-base indicator titration method to monitor the water acidity and determines the titration end point in combination with the absorbance change of the indicator in the titration process, not only realizes online monitoring of the water acidity, but also is simple and convenient to operate, does not need high-frequency maintenance, can effectively reduce the use cost, improves the water acidity monitoring precision, and is suitable for popularization and application. And application and popularization are facilitated.

The invention provides an analysis method for measuring the pH value of an aqueous solution by using methyl red, and belongs to the technical field of pH value measurement. The analysis method comprises the following steps: mixing a standard solution and a methyl red solution with different pH values to obtain a color developing solution, then detecting an absorbance curve of the color developing solution by utilizing a detection device, reading absorbance, and drawing a working curve by taking the pH value of the color developing solution as a horizontal coordinate x and the absorbance as a vertical coordinate y; mixing a to-be-detected water sample and the methyl red solution, detecting to obtain an absorbance value, substituting the absorbance value into the working curve, calculating the pH value of the to-be-detected water sample, and displaying the pH value of the to-be-detected water sample. According to the analysis method, the acid-base indicator is used as an accurate pH meter, and the pH value of the solution can be measured on line, so that the application range of the acid-base indicator is widened.

The invention provides a pH measurement device and method based on an RGB color model, and relates to the technical field of pH measurement, the pH measurement device comprises a shading shell assembly, a to-be-measured liquid supporting table, an internal illumination assembly, an automatic liquid supply assembly, a camera shooting assembly and a pH measurement analysis assembly, a detection cavity for containing to-be-measured liquid is formed in the shading shell assembly, and the pH measurement analysis assembly is arranged in the detection cavity. A to-be-detected liquid containing position is planned in the detection cavity, the to-be-detected liquid supporting table is located at the to-be-detected liquid containing position, the internal lighting assemblies are located in the detection cavity and evenly distributed on the periphery of the to-be-detected liquid supporting table, and the automatic liquid supply assembly automatically supplies quantitative acid-base indicator according to to-be-detected liquid. The camera shooting assembly directly faces the to-be-measured liquid supporting table, the pH measurement and analysis assembly is connected with the camera shooting assembly and located on the outer wall of the shading shell assembly, and the distance between the camera shooting assembly and the to-be-measured liquid is 20 cm or above. The pH measuring device and method provided by the invention are beneficial to improving the accuracy of liquid pH measurement.

The invention provides a catechol violet oily acid-base indicator for judging the reaction endpoint of silicone oil. The invention discloses a yellow color in an acidic environment and a red purple color in an alkaline environment, and the color range is that the pH value is 1.5-7, the color range is yellow, the pH value is 7-9, and the color range is red purple, and the pH value is 9-11. The oily acid-base indicator has important application value in chemical production, catechol violet is used as a raw material, an ethanol-acetone-aqueous solution is used as a solvent, the silicone oil acid-base indicator is successfully synthesized, and the silicone oil acid-base indicator has the advantages of being simple in preparation, clear in color development, sensitive in color change and good in indication performance and has very good practical performance.

A two-part epoxy adhesive comprises a Part A and a Part B. Part A comprises, based on the total weight of components a) and b): a) 99.5 to 99.99 weight percent of at least one curable epoxy resin; and b) 0.01 to 0.5 weight percent of at least one pH indicator dye exhibiting an abrupt color change from colorless to a color in the pH range of 8.0-10.6. Part B comprises, based on the total weight of components c)-f): c) 89 to 97 weight percent of at least one aliphatic primary polyamine; d) 1 to 3 weight percent of at least one tris(2,4,6-dialkylaminoalkyl) phenol having from 13 to 24 carbon atoms; e) 1 to 3 weight percent of at least one aliphatic tertiary 1,3-bis(N,N-dialkylaminoalkyl) urea having from 6 to 24 carbon atoms; and f) 1 to 5 weight percent at least one of an alkali metal nitrate or an alkaline earth nitrate. The ratio of the total combined weight of components a) and b) to the total combined weight of components c)-f) is in the range 1.0 to 1.5. A reaction product thereof and a method of bonding are also disclosed.

The invention discloses a treatment method for determination interference caused by turbid filtrate and colored filtrate of sodium bicarbonate leaching liquor, and belongs to the technical field of soil detection. In order to solve the problems of turbid filtrate, color interference, large pH value adjustment error and the like in the existing sodium bicarbonate extraction method, the method comprises the following steps: adding 1% sodium chloride into a sodium bicarbonate extraction solution, so that the clarity of the filtrate is remarkably improved; sodium hypochlorite is added into the filtrate for standing within 15min, so that effective decoloration is realized, and phosphorus determination is not influenced; bromcresol green is used as an acid-base indicator, color mutation is obvious, and personal errors are reduced. The method is simple to operate, can effectively solve the detection problem in the existing sodium bicarbonate extraction method, improves the accuracy and reliability of soil available phosphorus determination, and provides an accurate data basis for soil fertility evaluation and fertilization measure formulation.

The invention provides a pH test composition, a pH test tablet containing the pH test composition and application. The pH test composition comprises a pH indicator, a dechlorinating agent and an additive, wherein the dechlorinating agent comprises any one or a combination of at least two of sodium thiosulfate, sodium sulfite or sodium ascorbate. The dechlorinating agent is added into the pH testing composition, so that the original pH detection is not influenced, the detection sensitivity and the detection precision of the pH in the chlorine-containing water phase to be detected can be improved, and the pH testing composition can be applied to pH detection of swimming pool water and tap water and has a wide application prospect.

To provide a microcarrier that enables confirmation of contamination.SOLUTION: The problem is solved by a microcarrier having an acid-base indicator fixed on its surface. It is more preferable that an amount of the acid-base indicator fixed on the microcarrier is 0.1 μg / cm2 to 900 μg / cm2.SELECTED DRAWING: None

This pH measurement device comprises: target matter which contains a pH indicator and a substance that causes a pH value to vary; reference matter to which a pH indicator has been added; an illumination unit (1) which irradiates at least one of the reference matter and the target matter with light; a detection unit which, from among light emitted from the illumination unit (1), detects the intensity of at least one of first light that has passed through the target matter and second light that has passed through the reference matter; and an estimation unit which estimates the pH value of the target matter on the basis of the results of detection by the detection unit.

The invention discloses a membrane material, a formic acid sensor and a formic acid detection method. Comprising a hydrophobic polymer, a pH indicator and an amphiphilic surfactant, the acid-resistant and high-humidity-resistant formic acid sensing film based on the phase separation water storage structure is used for detecting formic acid, an indicator of the sensing film cannot be inactivated under the acidic condition, and the sensing film is simple to prepare, high in response speed and low in cost; by introducing the amphiphilic surfactant, a hydrophobic / hydrophilic separation layer is formed on the surface of the film, permeation of water molecules in ambient air is inhibited, a water molecule exchange channel existing inside and outside a traditional formic acid sensing film based on a pH indicator is cut off, and the stability of the film structure is kept; the water storage layer is used for replacing environment combined water, and accurate monitoring of formic acid under the high-humidity condition is guaranteed.

A device is provided for monitoring ultrasonic energy applied to an object. The device comprises a container comprising water and at least one composition selected from the group consisting of: a water insoluble organic liquid as an emulsion aid and an oil; and optionally a pH indicator and at least one of a nitro compound or a halo compound.

The present invention provides a cleaning composition containing alkaline electrolyzed water, which facilitates the production of a diluted solution having a predetermined pH. [Solution] A cleaning composition is provided which contains bromothymol blue, thymol blue, or phenolphthalein as a pH indicator, and alkaline electrolyzed water having a pH of 12 or higher.

The present invention relates to the technical field of biological material preservation, and particularly discloses an RNA preservation tube, which comprises: an amino acid component selected from at least one of glycine and a derivative thereof; the EDTA metal chelating agent is selected from at least one of EDTA alkali metal salts and hydrates thereof; a preservative component; optionally comprising a pH indicator; the storage tube is provided with a sealed cavity for storing an RNA solution, and the volume of the cavity is 1-20ml; through combination of a glycine-EDTA synergistic buffer system and an imidazolidinyl urea preservative, long-acting stable preservation of an RNA sample in an extreme environment is realized, metal ions can be dynamically chelated and the pH value is maintained in a range of 6.8-7.5 through a specific ratio of glycine to EDTA salt, a multi-protection mechanism is formed by combining a tube wall nucleic acid adsorption inhibition treatment technology, and the RNA sample can be stably preserved in the extreme environment through the combination of the glycine-EDTA synergistic buffer system and the imidazolidinyl urea preservative. And the loss caused by RNA enzyme activity, acid-base degradation and physical adsorption is effectively blocked, and the product is especially suitable for high-temperature transportation or long-term normal-temperature storage scenes.

The acid-base indicator has important application in the fields of chemical industry, food, medicine and the like, so that a plurality of inorganic and organic acid-base indicators are invented by people. The invention prepares two novel acid-base indicators with similar processes and properties. The method specifically comprises the following steps: firstly, dissolving chitosan by using an aqueous solution of lactic acid, then adding a ferrous sulfate solution into the solution, and dialyzing and standing to obtain a solution containing ferrous ions. Adding potassium ferricyanide into the solution to obtain an indicator A; adding ammonium thiocyanate and a small amount of sulfuric acid into the indicator A to obtain an indicator B; the two indicators are blue and faint yellow when the pH value is 9-10 or above. Wherein the indicator B can still turn blue after being added into the acid solution again.

The invention belongs to the field of molecular biology and biomedical engineering, and particularly relates to an LAMP colorimetric detection system, application of the LAMP colorimetric detection system and a method for detecting nucleic acid through an LAMP colorimetric method with the synergistic enhancement effect of an indicator. The LAMP colorimetric detection system contains a magnesium ion indicator and a pH indicator; wherein the volume ratio of the magnesium ion indicator to the pH indicator is 1: 1. According to the LAMP colorimetric method disclosed by the invention, the use of an indicator is improved, the change of a Mg < 2 + > compound and H < + > is detected depending on the synergistic effect of a pH indicator phenol red and a magnesium ion indicator chrome black T, which represents that the DNA target is successfully amplified, and a colorimetric result is quantized into a delta Hue value which is increased to 300 degrees from original 100 degrees, so that the accuracy of the result is improved, and the detection time is shortened. And the function of a qPCR instrument is simulated to quantify the delta Hue value in real time, so that the capability of the method in outdated regions and field detection is greatly improved.

The invention belongs to the field of molecular biology and biomedical engineering, and particularly relates to a primer group for plasmodium genus and species identification and a colorimetric detection method based on loop-mediated isothermal amplification (LAMP). The primer group comprises a primer group of plasmodium and a specific primer group between plasmodium species; wherein the primer group (Pan-Plasmodium (Pan)) of the plasmodium is sequence information (5 '-3'), and the specific details are recorded in the specification. And through the optimally designed LAMP reaction system and the chromogenic reaction of the magnesium ion by-product and the pH indicator, the identification result of the sample can be judged, the detection efficiency is improved, and the visual instant detection of the plasmodium species is realized. Compared with existing microscope detection and rapid diagnosis test paper, the test paper has the advantages of short detection time, high sensitivity, strong specificity and the like, and provides a new technical means for accurate diagnosis, prevention and control of malaria.

The invention discloses a method for detecting the pH value of a microbial culture solution with high throughput, which comprises the following specific steps: loading a culture solution inoculated with microorganisms into a high-throughput spectrum detector, carrying out shielding correction on an optical system, introducing a pH indicator of which the color is changed along with the change of the pH value of the culture solution into the microbial culture solution, and detecting the pH value of the microbial culture solution. Then carrying out closed culture on the microorganism culture solution; in the closed culture process, the optical density of the culture solution under a specific wavelength spectrum is recorded in real time at regular intervals, the optical density is converted according to a preset pH value calculation formula, and a corresponding pH value is obtained. The invention provides an efficient, accurate and economical method for monitoring the pH value of the microbial culture environment.

The invention belongs to the technical field of biological detection, and particularly relates to a high-sensitivity colloidal gold immunochromatography kit and application thereof. According to the invention, a traditional colloidal gold immunochromatography kit is improved, that is, glucose and a redox indicator or an acid-base indicator are loaded on a sample pad of a test strip; on the basis of the principle that glucose is catalyzed by colloidal gold to generate oxidation reaction to generate hydrogen peroxide and gluconic acid to change color of a redox indicator or an acid-base indicator, when a colloidal gold method is used for detection, the indicator changes color due to the oxidation reaction at a colloidal gold nanoparticle aggregation part of the kit, so that the original signal intensity is increased, and the detection sensitivity is improved. The sensitivity and the accuracy of colloidal gold immunochromatography detection are greatly improved.

There is disclosed a metal ion detection device, comprising a working electrode on which a droplet of the solution sample is placed, a counter electrode; and a reference electrode, wherein a droplet of a pH indicator solution is further placed on the working electrode surface after drying the working electrode surface, leading to conversion of metal ions present in the solution sample to corresponding metal atoms and deposition of the metal atoms on the working electrode surface. The working electrode is a glassy carbon electrode modified with amino-functionalized multi-walled carbon nanotubes (MWCNTs-NH2) and an amide derivative of benzoic acid (ADB). The device enables multi-metal ions detection, toxic metal ions removal from wastewater and metals enrichment / recovery via electroreduction. A method of detecting multiple co-existing metal ions from a solution sample is also proposed.

There is disclosed a metal ion detection device, comprising a working electrode on which a droplet of the solution sample is placed, a counter electrode; and a reference electrode, wherein a droplet of a pH indicator solution is further placed on the working electrode surface after drying the working electrode surface, leading to conversion of metal ions present in the solution sample to corresponding metal atoms and deposition of the metal atoms on the working electrode surface. The working electrode is a glassy carbon electrode modified with amino-functionalized multi-walled carbon nanotubes (MWCNTs-NH2) and an amide derivative of benzoic acid (ADB). The device enables multi-metal ions detection, toxic metal ions removal from wastewater and metals enrichment / recovery via electroreduction. A method of detecting multiple co-existing metal ions from a solution sample is also proposed.

The invention discloses a colorimetric array sensor constructed by combining hydroxylamine hydrochloride with a pH indicator and application of the colorimetric array sensor, a detection material in a sensing array does not need to be subjected to a complex synthesis process, each sensing unit is composed of one hydroxylamine hydrochloride and one pH indicator, immediate response to aldehyde and ketone compounds can be realized within 4 minutes, and the detection sensitivity is high. And the effect is obvious. Compared with the existing array sensor, the sensor disclosed by the invention does not need to be synthesized, is low in cost, convenient to implement and rapid in response, and can be used for rapid identification of aldehyde and ketone compounds and visual detection of complex samples rich in the compounds.

To provide a method for quantitatively determining substrate concentration in which a stable measurement result is obtained regardless of a subjective view of a measurer, a substrate concentration kit for quantitative determination, and test paper.SOLUTION: In a method for quantitatively determining substrate concentration in a test sample of the present invention, oxidase of the substrate is allowed to react with the substrate to create hydrogen peroxide, hydrogen ion is generated by autocatalytic reaction of the hydrogen peroxide and sulfite, a color of a pH indicator is changed by pH reduction by increasing the hydrogen ion, and substrate concentration is quantitatively determined on the basis of a time of color change of the pH indicator.SELECTED DRAWING: None

The invention discloses a pinellia tuber soft rot fungus infection dynamic detection method, which comprises: applying a pH indicator to a to-be-detected surface of a plant tissue sample, and carrying out timing observation after the application; the color change range of the pH indicator at least covers pH 5.0-pH 7.0. The invention provides a dynamic monitoring system combining chromogenic reaction and pH value change, the method can be used for dynamic detection of soft rot fungus infection of pinellia tuber tubers, the method is simple and convenient in detection process operation, does not need complex equipment, is suitable for laboratory environment and can also be used for rapid field detection, the detection efficiency is improved, and the detection scene is expanded.

The present invention provides derivatized indicator compounds, such as pH indicator compounds, which can be covalently immobilized to a variety of solid substrates to produce an indicator pad. Such pads can be used to monitor water quality in variety of settings. In particular, the pads of the invention are useful in devices which monitor the quality of recreational water, such as water in swimming pools, hot tubs, and amusement park attractions, including water slides, and water-based rides. The present invention overcomes the limitations of commercially available pad chemistries.

The invention relates to the field of detection, and discloses a neutral-alkaline pH indicator capable of being recognized by naked eyes as well as a preparation method and application of the neutral-alkaline pH indicator. According to the neutral-alkaline pH indicator, anthocyanin in different fruit peels is extracted, compounding is conducted on the basis of the pigment three-primary color theory, a blend of summer black grape peel source anthocyanin and black wolfberry peel source anthocyanin is selected as an effective active substance to prepare the neutral-alkaline pH indicator, and the pH indicator indicates various color changes within the neutral-alkaline range (pH 6.0-10.0); the naked eye recognition contrast ratio is high, and the highest fine indication precision reaches 0.2 pH indexing. The invention also performs application detection of volatile biogenic amines such as trimethylamine in the food field, and the result shows that the pH indicator has high human friendliness on the basis of naked eye identification, high matching degree and high precision, does not generate food-borne food safety risks, and can be suitable for detection in the food field.

The invention discloses an alkaline hazardous waste neutralizer based on imidazolium ionic liquid and a preparation method and application thereof.The neutralizer is composed of an agent A and an agent B. The agent A comprises the imidazolium ionic liquid, a weak acid compound and a pH indicator, and the weight ratio of the ionic liquid to the weak acid compound is 1: (0.1-10); the weight of the pH indicator in the agent A accounts for 0.1%-1% of the total weight of the agent A, the agent B is bentonite, the ratio of the agent A to the agent B is (4-20): 1, and the prepared neutralizing agent is used for neutralizing leaked alkaline waste. The neutralizer disclosed by the invention has a good neutralizing effect, can effectively reduce the alkalinity in wastes and rapidly dehydrate and solidify hazardous wastes, meets the requirement of safe disposal, and has the advantages of high neutralizing efficiency, high thermal stability and chemical stability, environmental friendliness, wide application range and the like.

The colorimetric indicator 5 includes a UV radiation-driven acid releasing agent, a pH indicator that changes color between the deprotonated form and the acid form, a proton scavenger, and a UV stabilizer.