814results about "Analysis using chemical indicators" patented technology

Printer activatable environmental sensing through chemical encapsulation are disclosed herein. An example activatable environmental sensor print medium includes a substrate, an environmental indicator material configured to respond to a predetermined environmental stimulus, and a plurality of microcapsules on or embedded in the substrate. The microcapsules contain the environmental indicator material and are configured to respond to at least one of an activation heat and an activation pressure by allowing the environmental indicator material to be released from the microcapsules. The environmental indicator material, after being released from the microcapsules, is configured to respond to exposure to the predetermined environmental stimulus by causing a detectable response.

Microparticles for detecting biological materials are provided. Each of the microparticles includes: a core-shell structured microparticle consisting of a core including a magnetically responsive metal and a shell layer surrounding the core and having a uniform thickness; and capture probes introduced onto the shell layer to capture biological materials.

The present invention belongs to the technical field of mechanochromic materials, and specifically relates to a mechanochromic material containing rhodamine with a hydantoin structure, and its preparation method and application. The rhodamine mechanochromic material containing a hydantoin structure is shown in structure (I), with rhodamine B as the matrix, reduced to rhodamine alcohol, oxidized to generate rhodamine aldehyde, and reacted with hydantoin to prepare a six-membered spirocyclic rhodamine containing a hydantoin structure. The rhodamine compound containing a hydantoin structure involved in the present invention has good ion interference resistance, exhibits photochromic properties in a dichloromethane solvent, and has the properties of mechanical stress discoloration and solvent mixing stress discoloration with high contrast and good repeatability. The solid powder of the rhodamine mechanochromic material containing a hydantoin structure has the characteristic of changing color upon grinding. After the action of mechanical force, the color of the powder changes from yellow to pink, and a reversible color change is achieved during the grinding-heating process.

Multi-parameter water analysis system with a holder removably engageable in an enclosable water chamber having an inlet and outlet in line with plumbing of an aquatic environment and allowing water from the aquatic environment to enter the enclosable water chamber for a chemical indicator of the holder to indicate a physical change via an optical reader, the holder configured to move with respect to the optical reader at least in part due to a motive force provided by the flow of water from the inlet in the enclosable water chamber.

The invention belongs to the technical field of carbon capture, and particularly relates to a method and a device for measuring the concentration of amine in a carbon capture absorbent. The determination method comprises the following steps: (1) calibrating the consistency of a reference amine solution and a pH meter; (2) judging a potentiometric titration end point; and (3) determining the amine concentration of the carbon capture absorbent. The detection method is simple and feasible, the determination device is simple in structure and convenient to operate, and the concentration of the amine in the online running carbon capture absorbent can be monitored, so that the effective running of the carbon capture device is ensured, and the problem that determination cannot be performed due to the fact that a sample is dark in color and cannot be distinguished at a titration end point in a color indicator method is solved.

To provide an amine detection method capable of detecting the amine with high sensitivity and good reproducibility by having a large amount of fluorescence quantum change before and after contacting with the amine.SOLUTION: In a method for detecting an amine, the amine is detected from a difference between a maximum fluorescence intensity X1 of a fluorescent substance represented by formula 1 before contacting the amine and a maximum fluorescence intensity X2 of the fluorescent substance after contacting the fluorescent substance to the amine. In the formula 1, R represents a hydrogen atom, an alkyl group which may have a substituent, a benzyl group which may have a substituent, or an aryl group which may have a substituent, A represents a spacer, and Z represents an atomic group which exhibits fluorescence emission upon photoexcitation.SELECTED DRAWING: Figure 1

The present invention provides a powdered or fibrous or granular or pelleted material, and a method for preparing the material, for measuring glucose concentration in a liquid sample. The devices are typically in the form of a chemically treated granular or powdered or fibrous or pelleted material. The granular or powdered or pelleted or fibrous material is treated with a reagent mixture or solution comprising an enzyme or enzymes, or a combination of an enzyme with a pigment or another compound, a chromogen, and neutralizer. The chromogen in the reagent solution changes color when the reagent solution is exposed to glucose.

A marker composition for application to a medical device or a surface is disclosed. The marker composition comprises a carrier composition including water, nonionic surfactant, organic solvent, and a neutral or anionic viscosity modifier. The marker composition further comprises a dyestuff. In some embodiments, the quantity of dyestuff present is such that at least some of the dyestuff is present as a dispersed solid phase. The dyestuff may be a naturally-derived dyestuff, such as spirulina extract (including phycocyanin). The invention extends to a carrier composition for a dyestuff.

Images of smoke captured over a time duration are obtained, and temporal and spatial features of the images are extracted. The temporal features are representative of changes across the images and the spatial features are representative of texture and color in the images. The temporal and spatial features are combined, with the combined temporal and spatial features being representative of both static appearance and dynamic motion of smoke in the images. The combined temporal and spatial features are used to determine the opacity of smoke in the images.

The invention relates to the technical field of environmental analytical chemistry, and discloses a thymol phenolphthalein-TBPE double indicator-based cyanide titration detection method and system, and the method comprises the following steps: adjusting a water sample to be detected to an alkaline pH interval to construct a detection matrix; the method comprises the following steps: introducing a double-indicator system composed of thymol phenolphthalein and tetrabromo phenolphthalein ethyl ester according to a specific ratio into a detection matrix, and constructing a spectrum background for masking yellow interference of sulfide by utilizing the blue color development characteristic of thymol phenolphthalein; dropwise adding a silver nitrate standard solution into the mixed system to execute a complex reaction; according to the method, a spectrum background shielding field is constructed, chromaticity response of a system in a specific wave band is monitored in real time, and when a chromaticity mutation signal from green to bluish violet is captured, a titration end point is judged, and the cyanide concentration is calculated. High-precision anti-interference detection on cyanide in a complex high-turbidity matrix is realized, and the sensitivity and accuracy of end point recognition are improved.

A blood testing device for detecting hemolysis in a blood sample is described. The blood testing device comprises an housing for containing the blood sample. The housing has a treatment window and an optical zone formed therein. The blood testing device further includes an acoustic transducer positioned to selectively generate acoustic forces directed into the treatment window of the housing and a control unit for selectively actuating and deactuating the acoustic transducer to permit colorimetric analysis of plasma within the blood sample.

The present invention provides an ACQ fluorescent probe composition, which is characterized in that the ACQ fluorescent probe composition is a probe solution for directly determining the cmc concentration of a surfactant, the ACQ fluorescent probe composition comprises a probe molecule and an auxiliary agent, the probe molecule is a fluorescent molecule having the property of aggregation-caused luminescence quenching (ACQ), the auxiliary agent comprises more than one non-volatile organic solvent, and the auxiliary agent is a non-volatile organic solvent. The boiling point of the organic solvent is 100 DEG C or more, and the HSP distance Ra, which is the distance between the Hansen solubility parameters of the probe molecule and the organic solvent, is 17 (MPa) 1 / 2 or less. Also provided are a cmc measurement method, a stain cleaning concentration determination method, a detergent delivery control method, and a detergent delivery control system using the ACQ fluorescent probe composition.

Marker composition comprising water, 1-10 wt.% non-ionic surfactant selected from alkyl polyglucosides, alcohol ethoxylates and alcohol ethoxylate propoxylates, or mixtures thereof, 1-5% organic solve

Methods and kits are provided for detecting and quantifying a PFAS compound or a mixture of PFAS compounds in a sample. The method includes the steps of providing a complex of a cyclodextrin and an indicator molecule, contacting the complex with the sample and measuring a parameter of the indicator molecule. The parameter is correlated with an extent of displacement of the reporter molecule from the cyclodextrin and binding of the PFAS compound to the cyclodextrin. This indicates the presence and quantity of the PFAS compound in the sample. The method is useful for monitoring samples such as environmental water samples. The kits include assay solutions for performing the methods and may also include solid-phase extraction matrices for pre-treatment of samples.

Devices to detect analytes (e.g., charged species such as ions) in samples are provided as are methods for their use. The devices comprise a tube or container comprising a water-immiscible sensing oil phase comprising at least one sensing chemical that binds the at least one analyte. The tube further receives an aqueous sample. Upon mixing of the two immiscible phases, the analyte partitions into the oil phase and binds to the sensing chemical, delectably changing the optical properties of the sensing chemical (or of an associated reporter molecule). Detection of the changes permits quantification of the amount or concentration of analyte in the sample without optical interference from the sample. The devices are suitable for home use and other decentralized settings.

An ultrasound indicating (USI) device and method for monitoring ultrasonication is provided. The USI device comprises a container comprising a USI formulation. The USI formulation comprises an organic liquid, a pH dye and an activator.

Compositions, systems, and methods are provided for detecting target particles, such as target actinide particles. The composition includes 2‑(5‑Bromo‑2‑pyridylazo)‑5‑(diethylamino)phenol (Br‑PADAP), 1‑(2‑Pyridylazo)‑2‑naphthol (PAN), and iron in effective amounts such that on a condition that the composition is in contact with the target actinide particle, a colorimetric output is produced.

The invention discloses a method for determining the content of total iron, ferrous iron and ferric oxide in a covering agent. The method comprises the following steps: determining total iron by using a titanium trichloride-potassium dichromate titration method, determining ferrous iron by using a potassium dichromate titration method, and calculating ferric oxide according to the content of total iron and ferrous iron. The method provided by the invention can provide accurate data for the content of total iron, ferrous iron and ferric oxide in the covering agent.

The invention discloses a method for determining the concentration of phosphate radicals in a water sample. The method includes providing a water sample, determining a first phosphate concentration of the water sample at a first temperature by molybdenum yellow method or by a variation of molybdenum yellow method, and determining a corrected phosphate concentration of the water sample at a second temperature by molybdenum yellow method or by a variation of molybdenum yellow method if the first phosphate concentration is within a specified range.

The invention discloses a testing device which comprises a cavity used for receiving a liquid sample, a cover body, the cover body is used for sealing the cavity, the cover body further comprises a carrier with a groove, the carrier is used for receiving and holding a test strip, the cover body further comprises a hole, the hole is communicated with the groove, and the hole is communicated with the groove. The cover body is provided with a mark, the connecting line between the mark and the hole is the shortest distance, and when a test is carried out, the mark is set to indicate an inclined direction, so that a liquid sample is in contact with a test area of the test strip in the groove, and by adopting the device, the test can be rapidly carried out, the operation is simple and convenient, and the test efficiency is improved. And the test result is more accurate.

The invention discloses a method for detecting the content of iron oxide impurities in brown aluminum oxide. The method comprises the following steps: sampling; preparing a sample solution; obtaining the volume of the sodium thiosulfate solution consumed by the sample solution; obtaining the volume of the sodium thiosulfate solution consumed by the purified water; and determining the percentage content of the iron oxide impurity in the brown aluminum oxide. According to the method for detecting the content of the iron oxide impurity in the brown aluminum oxide, the content of the impurity ferric oxide in the brown aluminum oxide can be simply and quickly detected at very low cost under the conditions that expensive instruments are not used and tedious and complicated operation steps are not needed.

A portable device which detects a Raman signal from an analyte of interest contained in or suspected to contain in a sample. The portable device includes a laser source in optical communication with a dichroic mirror, an objective lens optically positioned to consolidate the laser from the laser source to the sample, (i) a pair of rotatable filters in optical communication with the dichroic mirror and an optical transmission module or (ii) a first band-pass filter in optical communication with the dichroic mirror and an optical transmission module, and a detector optically positioned to receive and detect a Raman signal produced from the laser incident on the analyte of interest. The dichroic mirror directs the laser from the laser source to the sample through the objective lens and transmits any Raman signal from the sample toward the detector. The detector is absent of a spectrometer and detects the Raman signal.

Disclosed is use of a compound of formula (I) to determine the quantity of clay in a sand and / or to determine the amount of CMA compound to be added to a hydraulic binder composition using a sand:R1—(OA)n—XR2  (I)where: R1 is a linear or branched C1 to C4 alkyl groups, or a coloured compound; R2 is a coloured compound; A, each the same or different, are independently a —CH2—CH2— group or —CH(CH3)—CH2— group; n is an integer of between 1 and 500, preferably between 4 and 250; and X is O or NH.

The use of halogen / hydrogen bonding receptors for sensing sulfur mustard and its derivatives are described.

The present disclosure belongs to the technical fields of nanoscience and fluorescence sensing, and specifically relates to a preparation method of a paper-based sensor for detecting an ammonia gas, and a use of the paper-based sensor. In the present disclosure, Zn(PA)(BPE) is first prepared, and a porous structure on a surface of the Zn(PA)(BPE) is used to adsorb an ammonia gas to improve a reaction sensitivity of the ammonia gas; then a Zn(PA)@CNQD ratiometric fluorescent substance is prepared from Zn(PA)(BPE) and CNQD through embedding, and finally dissolved in ultrapure water (UPW) to obtain a solution; and the solution is added dropwise on a filter paper, and the filter paper is purged with nitrogen, such that the solution is loaded on the filter paper to obtain a ratiometric fluorescent paper-based sensor.

The present invention discloses a rapid hydrogen peroxide test kit and a method of using the same, the rapid hydrogen peroxide test kit comprising a sample diluent and a test strip containing a chromogen for detection and a chromogen for quality control in a dry environment. The sample diluent comprises 100-500 mM ammonium oxalate, 0.3-2.0 mM 8-hydroxyquinoline, 50-500 mM sodium chloride, and 10-100 mM of a first pH adjuster for pH 4.5-7.0.

An embodiment provides a method for measuring arsenic in a sample, showing marked increase in sensitivity over previous methods including: preparing a compound of metal-plated zinc and zinc; introducing the compound to an acidified sample, wherein the sample contains an amount of arsenic, wherein the compound reduces the amount of arsenic to produce arsine gas; wherein sufficient hydrogen gas is produced to purge the sample solution; wherein the arsine gas is completely purged from the sample and captured on a test pad, wherein the pad comprises mercuric bromide, wherein the capturing produces a color change of the pad; and measuring the amount of arsenic in the sample by measuring the color change of the pad. Other aspects are described and claimed.

The invention relates to a method for determining phosphate in a water sample, comprising the steps: b) provision of a water sample, c) addition of an acid in such a way that the concentration of acid in the water sample amounts to at least 0.5 wt%, d) first photometric measurement of the water sample solution, e) addition of a colouring component to the photometric water sample solution, f) second photometric measurement, and g) calculation of the phosphate concentration from the difference between the first and the second photometric measurements.

An embodiment provides a method for measuring an ion component of an aqueous sample using a photoreactive species, including: generating a metal organic framework by combining, in a reactive solution, at least one organic linker and at least one metal; impregnating the metal organic framework with the photoreactive species; introducing the impregnated metal organic framework into an aqueous sample; and measuring an analyte component concentration of the aqueous sample, wherein the measuring comprises measuring a change in the aqueous sample, wherein the change is responsive to the analyte component dissolving at least one of: the at least one organic linker and the at least one metal, and releasing the photoreactive species. Other embodiments are described and claimed.