97results about "Investigating pH value" patented technology

Color changeable indicator particles having a meltable, particulate organic core, and at least one color changeable indicator coated on the particulate organic core. Color changeable indicator particles can be incorporated into composite polymer materials while maintaining the efficacy and stability of the indicator. The indicators provide simple, reliable, and cost effective detection means for detecting ammonia and carbon dioxide, and may find use in applications such as food packaging and medical applications.

The invention relates to a color-changing smart indicator (A) to be used in packaging in the food industry.

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 relates to the technical field of fences, and discloses a safety protection device for building civil engineering, which comprises a hollow seat, the top of the hollow seat is in bolted connection with a fence body, the top of the fence body is fixedly connected with a fence, and the side surface of the fence body is provided with self-adaptive change early warning equipment; according to the safety protection device for the building civil engineering, through the design of the self-adaptive change early warning equipment, the pH value of rainwater is acidic, a litmus reagent and the rainwater are mixed to generate color change, the litmus reagent and the rainwater are mixed to develop a red warning effect, the red warning effect is achieved, and the shape design that a warning glass color-changing cover has warning significance is matched, so that the safety protection effect is achieved. Compared with the prior art that warning flickering is achieved through various electronic elements, manual operation is reduced, and excessive loss of the electronic elements due to the fact that the electronic elements are eroded by rainwater is avoided.

Described herein is a method of analyzing nutrient content in soil, the method comprising a) obtaining a soil sample, b) adding a liquid to the soil sample to form a soil slurry, c) flowing the soil slurry through a filter, whereby the filter is oriented such that the soil slurry flows downward through the filter at least partially under the effects of gravity, d) blending a reagent composition with the soil slurry to form a soil mixture, and e) measuring an absorbance of the soil mixture.

Visual indicating paste compositions are provided that are capable of producing a detectable color change upon contact with an aqueous liquid. The paste compositions include an indicator dye capable of changing color over a pH range of about 3 to about 11; an inorganic base capable of being converted to a more basic substance upon reaction with water; a liquid carrier (e.g., a polyalkylene glycol carrier); optionally, a gelling agent such as silica gel; and a proton donating compound such as a carboxylic acid or an organic sulfonic acid. When applied to a measuring probe, the paste compositions are particularly useful for detecting the level of water in the bottoms of tanks and delivery systems containing fuels such as gasoline by producing a clear, detectable color change upon contact with an aqueous liquid without bleeding or run-off. The paste compositions exhibit long shelf life and improved water resistance.

A method for distinguishing resveratrol and piceatannol is characterized in that a 'Formaldehyde-Na2S2O5-Na2SO3-EDTA-D-gluconic acid-delta-lactone' pH clock reaction system is used as a distinguishing solution, and qualitative analysis of resveratrol and piceatannol is realized according to different influences of resveratrol and piceatannol on the highest pH value of the clock system and the time for reaching the highest pH value. The qualitative analysis method for resveratrol and piceatannol has the characteristics of high accuracy, easiness in operation, convenience, rapidness and the like.

Described herein is a method of analyzing nutrient content in soil, the method comprising a) obtaining a soil sample, b) adding a liquid to the soil sample to form a soil slurry, c) flowing the soil slurry through a filter, whereby the filter is oriented such that the soil slurry flows downward through the filter at least partially under the effects of gravity, d) blending a reagent composition with the soil slurry to form a soil mixture, and e) measuring an absorbance of the soil mixture.

To provide pH responsive compounds, micelles, and compositions useful for the detection of primary and metastatic tumor tissues.SOLUTION: There are provided a block copolymer of Formula (I), a micelle comprising one or more kinds of the block copolymer, and a pH responsive composition comprising the micelle, wherein the micelle has a pH transition point and an emission spectrum.SELECTED DRAWING: Figure 1

The invention discloses a nano-channel based on Pd-Co cyanogen gel nano-enzyme, a preparation method and application of the nano-channel in glucose detection, and belongs to the technical field of biosensors. The nano-channel based on Pd-Co cyanogen glue nano-enzyme is a TiO2 nano-channel (TiNM) with two open ends, the two open ends are a large opening end and a small opening end respectively, metal organic frameworks (MOFs) are grown in situ in the TiNM through a biomimetic mineralization method to immobilize Pd-Co cyanogen glue nano-enzyme molecules, and a metal organic framework composite nano-enzyme structure is formed. Meanwhile, the end face of the small opening end is coated with a pH response polymer to form a gating structure. Glucose generates gluconic acid and hydrogen peroxide under catalysis of Pd-Co cyanogen gel nano-enzyme, the pH change in the channel is triggered, and the pH response polymer is dissolved, so that the gating structure is activated to be opened. The sensor is used for glucose detection, has relatively high selectivity and relatively strong anti-interference capability on glucose, and has good repeatability and operation stability.

To provide a novel method for diagnosing a film for degradation which allows a more efficient and more secure determination of a degraded state of the film based on resin.SOLUTION: The present invention relates to a method for diagnosing a film based on resin for degradation to achieve the object, the method using an analysis technique B as a non-destructive method as described below: the analysis technique B is a technique of confirming the presence or absence of acid anhydride and a sign of a hydrolysis reaction in the film by Fourier transform infrared spectroscopy analysis.SELECTED DRAWING: Figure 1

Described herein is a method of analyzing nutrient content in soil, the method comprising a) obtaining a soil sample, b) adding a liquid to the soil sample to form a soil slurry, c) flowing the soil slurry through a filter, whereby the filter is oriented such that the soil slurry flows downward through the filter at least partially under the effects of gravity, d) blending a reagent composition with the soil slurry to form a soil mixture, and e) measuring an absorbance of the soil mixture.

A multifunctional detection test kit includes a water test paper including a base and a plurality of test modules provided on different test zones of the base. Each of the test modules is configured to detect one of pH value, total alkalinity, cyanuric acid, total chlorine, bromine, free chlorine water hardness, lead, iron, copper, nitrite, nitrate, MPS, nickel, and phosphate.

The invention relates to a method for quantitatively detecting piceatannol, which is characterized in that a 'Formaldehyde-Na2S2O5-Na2SO3-EDTA (Ethylene Diamine Tetraacetic Acid)-D-gluconic acid-delta-lactone' pH (Potential of Hydrogen) clock reaction system is used as a detection solution, and quantitative analysis on piceatannol is realized according to different responses of the system to piceatannol with different concentrations, namely different times for reaching the highest pH value. The quantitative analysis method for piceatannol has the characteristics of high accuracy, easiness in operation, convenience, rapidness and the like.

The present application relates to a kind of sweat sensor with shunt dike structure.Sweat sensor includes detection layer and sealing layer arranged on detection layer;Sample collection hole is arranged on the detection layer, sample flow channel is communicated with the sample collection hole and extends to the outside of detection layer, a plurality of detection chambers are arranged on one side of the sample flow channel;One end of the detection chamber is connected to the sample flow channel by first flow channel, and the other end is connected to the sample flow channel by second flow channel;Shunt dike is formed between the sample flow channel, first flow channel, detection chamber, second flow channel, and part of the sample flows to the detection chamber along the first flow channel after shunting through the shunt dike after entering the sample flow channel from the sample collection hole;A plurality of water stop grooves are opened in the side wall of the sample flow channel away from the shunt dike;Sample detection chip is arranged in the detection chamber.The sweat sensor designed in the present application has smaller sweat evaporation loss and more accurate sweat detection result.

Methods for measuring pH of gel, paste, colloid, and aqueous solutions, such as a consumer product, a food product, a pet food product, a beverage product, a pharmaceutical product, and / or a medical product, are provided. The method may include preparing a calibration curve of a chemical species including or having an acid dissociation constant. Preparing the calibration curve may include plotting a chemical shift of the chemical species relative to pH. The method may also include determining a chemical shift of a gel, paste, and colloid, aqueous solutions, such as a consumer product, a food product, a pet food product, a beverage product, a pharmaceutical product, and / or a medical product, including the chemical species. The method may further include determining the pH of the gel, paste, colloid, and aqueous solutions, such as a consumer product, a food product, a pet food product, a beverage product, a pharmaceutical product, and / or a medical product, with the chemical shift of the product and the calibration curve.

A colourimetric indicator (5) comprises a UV radiation-driven acid release agent; a pH indicator which displays altered colour between deprotonated and acid forms; a proton- scavenging agent; and a UV stabiliser.

The invention provides in the use of an indicator, to indicate the degree of depolymerisation, preferably the degree of biodegradation, of a degradable polymer in a polymer composition or an article made from said polymer composition. The invention further provides in a polymer composition comprising an indicator to indicate the degree of depolymerisation, and a method to visualise the degree of depolymerisation.

The invention discloses an automatic potentiometric titration detection method for analyzing the content of sodium carbonate in alkali powder. The reaction principle in the process of detecting the content of sodium carbonate in the alkali powder is an acid-base neutralization reaction, the pH value in the reaction cup can change along with the continuous reaction process, the corresponding pH value is identified through the potential change of the electrode on the automatic potentiometric titrator to indicate the titration end point, and the content of sodium carbonate in the alkali powder is detected and analyzed. According to the detection result, the poor accuracy of the manual titration detection result is eliminated, the operation is simple, the reagent consumption is low, the detection efficiency is high, and the detection analysis of the effective calcium oxide content in the lime can be accurately and quickly realized.

Compositions for testing soil to measure one or more of the following properties of soil: pH, buffer pH, potassium, phosphorus, calcium, and / or magnesium. Test methods for testing soil to measure one or more of the following properties of soil: pH, buffer pH, potassium, phosphorus, calcium, and / or magnesium. A multichamber cartridge containing two or more of the compositions in separate chambers.

A multifunctional detection test paper includes a base and a plurality of test modules attached to the base. The base includes a base layer and a hydrophobic layer coated thereon, wherein the hydrophobic layer has a plurality of test zones spaced apart from each other. The test modules are provided on the test zones of the hydrophobic layer respectively to separate the test modules from the base layer, wherein each of the test modules includes a detection substance being configured to detect one of pH value, total alkalinity, cyanuric acid, total chlorine, bromine, free chlorine and water hardness when the test modules are immersed into water.

A diagnostic system for measuring inkjet printing system performance includes a printhead that deposits a colorless precoat solution from one or more of a plurality of ejector jets. The diagnostic system includes a diagnostic sheet, having a substrate, and a layer of material disposed on a first surface of the substrate, where the layer of material changes color after contacting the precoat solution, and an image scanner configured to capture a pattern on a surface of the diagnostic sheet after the precoat solution is deposited. The layer of material of the diagnostic sheet may include a moisture sensitive composition or a pH indicator. A method includes providing a diagnostic sheet to an inkjet printing system, where the diagnostic sheet may include a layer of material that changes color after contacting a precoat solution, and when needed, correcting one or more jetting operations.

Compositions for testing soil to measure one or more of the following properties of soil: pH, buffer pH, potassium, phosphorus, calcium, and / or magnesium. Test methods for testing soil to measure one or more of the following properties of soil: pH, buffer pH, potassium, phosphorus, calcium, and / or magnesium. A multichamber cartridge containing two or more of the compositions in separate chambers.

A hydrogen sulfide test kit includes: a first reactant powder containing citric acid, a second reactant powder containing sodium bicarbonate, and a test paper that changes color upon contact with hydrogen sulfide. The first and second reactant powders are physically isolated from each other. A method of using the hydrogen sulfide test kit and a method of detecting hydrogen sulfide in an aqueous sample both include: reacting citric acid and sodium bicarbonate in the aqueous sample to form bubbles, said bubbles releasing any hydrogen sulfide in the aqueous sample into a gaseous form; if the released hydrogen sulfide in gaseous form is present, contacting said released hydrogen sulfide in gaseous form with the test paper; and detecting the presence of hydrogen sulfide in the aqueous sample based on the color of the test paper.

Described herein is a method of analyzing nutrient content in soil, the method comprising a) obtaining a soil sample, b) adding a liquid to the soil sample to form a soil slurry, c) flowing the soil slurry through a filter, whereby the filter is oriented such that the soil slurry flows downward through the filter at least partially under the effects of gravity, d) blending a reagent composition with the soil slurry to form a soil mixture, and e) measuring an absorbance of the soil mixture.

An object of the present invention is to provide a novel method for diagnosing film degradation which can identify the degraded state of a film based on a resin more efficiently and reliably than ever. In order to attain this object, a method for diagnosing the degradation of a film based on a resin is adopted, the method comprising using the following analysis method A and / or analysis method B, which is a non-destructive analysis method: analysis method A: confirming the presence or absence of abnormality in the film by visual observation and olfactometry, and analysis method B: confirming the presence or absence of an acid anhydride and a sign of hydrolysis reaction as to the film by Fourier transform infrared spectroscopy analysis.

A multifunctional detection test paper includes a base and a plurality of test modules attached to the base. The base includes a base layer and a hydrophobic layer coated thereon, wherein the hydrophobic layer has a plurality of test zones spaced apart from each other. The test modules are provided on the test zones of the hydrophobic layer respectively to separate the test modules from the base layer, wherein each of the test modules includes a detection substance being configured to detect one of pH value, total alkalinity, cyanuric acid, total chlorine, bromine, free chlorine and water hardness when the test modules are immersed into water.

Described herein is a method of analyzing nutrient content in soil, the method comprising a) obtaining a soil sample, b) adding a liquid to the soil sample to form a soil slurry, c) flowing the soil slurry through a filter, whereby the filter is oriented such that the soil slurry flows downward through the filter at least partially under the effects of gravity, d) blending a reagent composition with the soil slurry to form a soil mixture, and e) measuring an absorbance of the soil mixture.

The present invention relates to a sensor for determining the concentration of an acidic or basic compound dissolved in water, wherein the determination is based on an ingress of gas or vapor of said compound, causing a change in pH value, within an inner buffer separated from a sample side by a membrane that is permeable to gases and impermeable to ions, characterized in that a layer is provided between the membrane and the sample side, wherein the layer substantially covers the membrane, wherein the layer is water-soluble and has pH buffering properties. The present invention further relates to the use of a water-soluble layer having pH buffering properties for protecting a sensor for determining the concentration of an acidic or basic compound from ingress of an acidic or basic gas during non-use of the sensor.