255results about "Analysis using chemical indicators" patented technology

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 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.

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.

A method for determining soluble aldehydes in a composition comprising one or more of (a) 2,5-furan dicarboxylic acid (FDCA), (b) terephthalic acid (TPA), (c) an ester of 2,5-furan dicarboxylic acid, and (d) an ester of terephthalic acid is described. The method can indicate even very low levels of soluble aldehydes associated with unacceptable color development in a) the composition, b) a portion of the composition, or c) a prepolymer, oligomer, or polymer at least partially prepared directly or indirectly from the composition or a portion of the composition, so that mitigating or improving measures can be taken in response.

A water quality testing method and a water quality testing apparatus. The testing method comprises: obtaining, in a first environment, a testing sample including a target testing object (S101); selecting a reference object according to the testing sample (S102), and respectively acquiring the chroma of the reference object in a second environment and in the first environment; constructing a correction model according to the chroma of the reference object in the second environment and in the first environment (S103); obtaining the chroma of the testing sample in the first environment (S104); according to the chroma of the testing sample in the first environment and the correction model, obtaining the chroma of the testing sample in the second environment (S 105); and according to a preset standard curve and the chroma of the testing sample in the second environment, obtaining the concentration of the target testing object in the testing sample (S106). The method is simple, has a high testing speed, has a wide application range, is independent of specific photographing conditions, has good applicability and stability for different photographing devices, light sources and photographing methods, and has a high testing accuracy.

The application relates to the technical field of water quality detection, in particular to a water-nitrogen element detection device which comprises a placing platform, a mixing mechanism, a comparison mechanism, a filtering mechanism and a detection mechanism, the mixing mechanism, the comparison mechanism, the filtering mechanism and the detection mechanism are all placed on the top of the placing platform, further comprises two pipe clamps, the mixing mechanism comprises a mounting frame and a fixed plate, the outer wall of the fixed plate is provided with a sliding hole, the two pipe clamps penetrate through the sliding hole, and the two pipe clamps are slidingly connected to the inner wall of the sliding hole, the application drives the wire roller to rotate the rotating shaft by pulling the pull ring and the soft rope, and the test tube is reset under the action of the torsional spring when the pull ring is released, so that the purpose of driving the test tube to shake is achieved, the purpose of mixing the solution in the test tube is achieved, the shaking range is stable, shaking is convenient, and the test tube can be tilted by pulling the pull ring when the solution is dipped, so that the operation is convenient.

This invention relates to the field of free lithium detection, specifically to a method for detecting free lithium and / or residual alkali in lithium supplements. The method includes the following steps: dispersing the lithium supplement in a solvent to obtain a first mixed system; filtering the first mixed system after allowing it to stand to obtain a filtrate; detecting the lithium ion content and transition metal element content in the filtrate, and calculating the free lithium and / or residual alkali content in the lithium supplement; the water content of the solvent is ≤500ppm. The method for detecting free lithium and / or residual alkali in the lithium supplement significantly reduces testing errors by controlling ambient humidity, solvent water content, and subtracting lithium hydroxide generated from the reaction with water and lithium contained in the lithium supplement passing through a microporous filter membrane.

The molecular adsorbent according to the present application adsorbs a polar molecule, and contains, as an active ingredient, an ion exchanger having: an ion exchange resin containing an ion exchange group which is a strongly acidic group; and a metal ion or a complex of a metal ion which is ion-exchanged with the ion exchange group. The polar molecule contains a nitrogen atom having a lone pair of electrons. The metal ion is one or more of a metal ion of 3 valence or more, Co 2+ , Cu 2+ , Ni 2+ , Mn 2+ , V 2+ , Cs + , Rb + , and K + .

The present disclosure relates to methods and kits for detecting free thiols in a substrate, and methods for quantifying the amount of free thiols in a substrate. In particular, the present disclosure provides a fluorescent Ellman's assay for increasing the sensitivity of the detection and quantification of free thiols.

The present invention relates to a method for detecting the possible presence of a chemical conversion layer on a part, comprising at least the following steps: A) a step of bringing at least part of the surface of the part into contact with an oxidizing composition; B) a step of detecting a possible persistent stain at the location of the contact as defined in step A).

To provide a reagent and a methyl salicylate sensor for detecting methyl salicylate which is a plant hormone released when a plant is infected with a pathogenic fungus in the cultivation of the plant including a field crop, to provide a method for sensing methyl salicylate using the same, and to provide a method for detecting the pathogenic fungus infection of the plant.SOLUTION: A reagent for detecting methyl salicylate, comprising a terbium compound and an amine. A methyl salicylate sensor includes a methyl salicylate capture part having the reagent, and a detection part for detecting that methyl salicylate is captured by the capture part.SELECTED DRAWING: None

To provide an electronic device that displays a results screen based on the results of urine analysis received from a urine analyzer. [Solution] The electronic device providing health management services related to urine analysis according to the present disclosure may include a display, a touch panel, a communication circuit configured to communicate with a urine analyzer configured to analyze urine using test strips forming multiple test strips, a processor, and a memory including computer program code. The memory and computer program code enable the electronic device, via the processor, to obtain a start input for urine analysis from the user, send a start signal for urine analysis to the urine analyzer based on the start input, receive a signal from the urine analyzer regarding the progress of urine analysis, display a screen regarding the progress of urine analysis based on the received progress signal, receive a signal from the urine analyzer regarding the result of urine analysis, and display a urine analysis result screen based on the received result signal.

A system includes a conduit configured to transport fluid between a first location and a second location, and a thermochromic indicator disposed on an outer surface of the conduit. The thermochromic indicator covers at least a portion of the conduit. A color of the thermochromic indicator depends on a temperature of the outer surface of the conduit, and the temperature of the outer surface of the conduit depends on an amount of material deposition inside the conduit that is at least partially aligned with a location of the thermochromic indicator.

This application belongs to the field of water quality testing technology, specifically relating to a method for testing ammonia nitrogen in wastewater from the hydrometallurgical process of laterite nickel ore. The method includes the following steps: adding sodium thiosulfate and zinc sulfate to the wastewater, adjusting the pH with a boric acid-sodium hydroxide buffer solution to pH 9.5, and allowing the solution to stand; filtering, taking an appropriate amount of filtrate into a colorimetric tube, and adjusting the volume, then adding potassium sodium tartrate and Nessler's reagent, mixing well, and allowing it to stand; measuring the absorbance, and calculating the ammonia nitrogen concentration in the wastewater based on the absorbance. This method can effectively eliminate the interference from high sulfate content and metal ions in high-sulfate industrial wastewater. The resulting colorimetric system is highly stable and has the advantages of being simple to operate and providing reliable results. It holds significant importance for the testing and treatment of wastewater from the hydrometallurgical process of laterite nickel ore.

A concentration determining element that can easily determine the concentration of hypochlorous acid in a test liquid, a method for manufacturing the concentration determining element, and a method for determining the concentration of hypochlorous acid are provided. [Solution] The concentration determining member of the present invention is a concentration determining member comprising a measurement substrate and a colored pattern provided on the surface of the measurement substrate, and is characterized in that the colored pattern contains an organic coating having a cationic group and an anionic dye.

The present invention relates to an analysis system for the qualitative and / or quantitative determination of ions in an ion-containing liquid medium. The present invention also relates to an analysis process performed with said analysis system. With the proposed analysis system and analysis process, ions in a wide variety of ion-containing liquid media can be qualitatively and / or quantitatively determined in an easy and inexpensive way.

A method for generating a supervisory output of chemicals, the method comprising: inputting one or more identifiers of one or more individual chemicals into an algorithm; inputting one or more concentrations of one or more individual chemicals into the algorithm; enriching attributes of the one or more individual chemicals by obtaining attributes of the one or more individual chemicals from at least one data source to generate enriched attributes; evaluating the enriched attributes of the one or more individual chemicals by applying predefined steps of the algorithm to generate representative attributes of the one or more individual chemicals; and generating a supervisory output of the composite material based on the representative attributes of the one or more individual chemicals.

Hydrocarbon enhanced ionophore-based ion-selective optodes (ISOs) and methods of their use are provided. The ISOs exhibit improved ultrasensitive ion sensing due to the addition of ultralow-polarity hydrocarbons to the sensing phase using specific ratios of sensing phase components. The ISOs can be operated under an exhaustive or non-exhaustive extraction response mode.

The invention discloses a method for detecting Fe < 2 + > and Fe < 3 + > in a zinc plating solution, which comprises the following steps: putting a zinc plating solution test solution into a conical flask, then adding hydrochloric acid and a copper sulfate solution, heating, taking down and slightly cooling to obtain a test solution; adding an isatin indicator into the test solution, uniformly shaking, then dropwise adding a titanium trichloride solution until the test solution becomes yellow from blue green, adding excessive titanium trichloride solution after the test solution is stable, adding distilled water, cooling, standing, adding sulfuric acid-phosphoric acid mixed acid after the test solution is obviously blue, then dropwise adding a sodium diphenylaminesulfonate indicator solution, and uniformly shaking; titrating with a potassium dichromate standard titration solution until the test solution is purple, and calculating to obtain the total iron content; and measuring the content of Fe < 2 + >, and calculating the concentration component of Fe < 3 + > according to the total iron content and the concentration component of Fe < 2 + >. The concentration of Fe < 2 + > and Fe < 3 + > can be monitored in real time, anode passivation is prevented, the production quality is controlled, the operation is convenient, the test time is short, and the accuracy of an analysis result is high.

Halogen bonding receptors are described, as well as their use in sensing dicarboxylates.

An embodiment of a method for measuring an amount of manganese in an aqueous sample includes: reducing, using a dechlorination reagent, wherein the dechlorination reagent comprises iron(ll) and potassium iodide; oxidizing, under an alkaline condition using sodium hydroxide, Mn(ll) to Mn(IV) in the aqueous sample, chelating, using etidronic acid (HEDP), Fe(ll) and Fe(lll) in the aqueous sample, oxidizing an amount of the colorimetric indicator 3, 3', 5,5'- tetramethylbenzidine (TMB) with Mn(IV); and measuring the amount of manganese within the aqueous sample, by measuring an absorbance intensity at a wavelength of the oxidized amount of 3,3',5,5'-tetramethylbenzidine (TMB). Other aspects are described and claimed.

A composition for the colorimetric quantification of corrosion inhibiting compounds in an industrial fluid, including an analytic reagent composition comprised of a non-aqueous transition metal-ligand solution mixed with a corrosion inhibitor containing fluid, where the combination produces a color change that quantifies the amount of the corrosion inhibitor in the fluid.