16 results about "PH indicator" patented technology

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 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.

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.

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 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 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.

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 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 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 invention discloses a visual failure treating agent for formaldehyde purification. The visual failure treating agent is prepared from the following components in percentage by weight: an oxidizing component, a stabilizing component and a stabilizing component, wherein the oxidizing component is 10-30% of sodium percarbonate; a pH buffer agent: 1%-5% of sodium bicarbonate; a stabilizer: 0.5%-2% of sodium silicate; a pH indicator: 0.001%-0.01% of phenolphthalein; and the balance of deionized water. The color changing interval of phenolphthalein is overlapped with the pH value decreasing interval of the treating agent when sodium percarbonate fails, and the formaldehyde detecting and treating device adopting the visual failure treating agent has the characteristic that whether formaldehyde purification fails or not can be judged by visually observing color change. The method has the beneficial effects that the color change critical point of the pH indicator is overlapped with the pH change critical point when sodium percarbonate fails, the color change is observed to directly indicate the failure state of the treating agent so as to facilitate timely replacement, the original'invisible and touchable 'purification process is converted into visual and perceptible color change, strict on-demand maintenance is realized, and the service life of the treating agent is prolonged. And the problem of purification failure caused by untimely replacement is completely eradicated.

The application discloses cat urine PH indicating cat litter and a preparation method thereof, and belongs to the technical field of cat litter. The cat urine PH indicating cat litter is prepared from the following raw materials in a weight ratio: 1-2 parts of deodorant, 3-5 parts of fiber powder, 12-20 parts of granules, 30-40 parts of adhesive, 8-10 parts of starch, 20-30 parts of PH indicator, and 10-20 parts of silica gel. The silica gel is used as a carrier without affecting the accuracy of PH testing. The non-toxic reagent is selected as the PH indicator, and the dosage is limited, and the PH indicator is non-irritating. Normal cat urine is weakly acidic, and the PH value is 5.5-7.5. If the PH value is lower than 5.4, the indicator shows blue-green to yellow. If the PH value is greater than 8.2, the indicator shows light red to purple red. The cat urine PH abnormality can be effectively prompted. Meanwhile, the indicator and other components are coated on the surface of the silica gel instead of being separately formed into granules and mixed with the silica gel granules, so that the cat urine can be easily absorbed and the indicator can be easily colored. The cat litter has the advantages of accurate testing, safety, non-toxicity, easy absorption, and abnormal coloration prompting.

The invention provides an analysis method for measuring the pH value of an aqueous solution by using phenolphthalein, and belongs to the technical field of pH value measurement. The analysis method comprises the following steps: mixing a standard solution and a phenolphthalein 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 phenolphthalein 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. 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 relates to the technical field of building materials and solid waste recycling, and discloses a silicon-aluminum solid waste raw material activity testing method which comprises the following steps: mixing a silicon-aluminum solid waste raw material with hydrochloric acid, reacting to remove impurities, filtering, washing to be neutral, drying, and verifying the impurity removal effect by using a rapid X-ray fluorescence spectrometry to obtain a treated sample; carrying out heating reaction on the treated sample and a sodium hydroxide solution, and filtering; adding an acid-base indicator into the filtrate, titrating with a hydrochloric acid standard solution, calculating the consumption of sodium hydroxide according to the titration consumption, and evaluating the activity of the raw materials; the method comprises the following steps: preparing mixed samples with different mass ratios from active minerals and inert minerals, measuring the titration result, drawing an active phase composition-titration result standard curve, and predicting the active phase content according to the titration result of a raw material to be measured. According to the method, chemical simulation and rapid titration are combined, so that quantitative evaluation on the activity of the solid waste is completed within several hours, and a traditional lagged evaluation mode depending on 28-day intensity experiments is thoroughly changed.

The present invention relates to a method and system for determining the pH of a fluid flowing in a measurement zone, using a colored pH indicator, and to at least one optical measurement system for measuring absorbance as a function of wavelength. Abstract figure: 1A