61results about "Element presence detection by oxidation" patented technology

The invention discloses a method for measuring the oxidation rate of silver ore, and relates to the technical field of mineral processing and process mineralogy analysis. The determination method comprises the following steps: preparing and segmenting a sample; silver grade calibration and reselection enrichment are carried out, and products with different mineralogical characteristics are obtained; carrying out automatic mineralogical analysis to obtain the type, content and dissemination characteristics of silver minerals; chemical leaching correction coefficient determination, wherein phase state distribution of silver is obtained through stepped chemical leaching, and the correction coefficient is calculated; determining a gangue wrapping correction coefficient, analyzing the silver content of the residue and calculating the correction coefficient; and finally, calculating the silver ore oxidation rate based on the automatic mineralogy analysis data and the correction coefficient. According to the method, through multi-technology fusion and data correction, the accuracy and reliability of measurement of the oxidation rate of the silver ore with low silver mineral content and uneven distribution are remarkably improved, and accurate data support is provided for formulation of a mineral separation process.

According to the present invention, a correction calculation unit 102 corrects absorbance by performing calculation by using a correction equation on the basis of the absorbance calculated by an absorbance calculation unit 101 at each wavelength. A turbidity component detection processing unit 103 provides a turbidity standard solution to an oxidation reaction unit, irradiates the turbidity standard solution after oxidation reaction with measurement light from a light source 51, and causes a detector 52 to detect the intensities at a plurality of wavelengths of the measurement light that has passed through the turbidity standard solution. A correction coefficient update processing unit 104 calculates the absorbance at each wavelength by means of the absorbance calculation unit 101 on the basis of the intensities, which are detected by the turbidity component detection processing unit 103, at the plurality of wavelengths, and updates update coefficients stored in the storage unit 200 on the basis of the absorbance calculated at each wavelength.

A gas detection fuse comprising a thin strip or sheet of a conductive material, such as a metal, connecting two electrodes for detecting a gas of interest. The metal is selected to be reactive with the gas of interest, and has a relatively large surface area, such that when the gas of interest contacts the metal, the electrical connection between the electrodes is broken (e.g., due to the metal losing physical integrity, or becoming non-conductive, as a result of the reaction with the gas). The gas of interest may be chlorine, and the conducting material may be tin. When the tin is exposed to chlorine the tin becomes oxidized to produce liquid tin tetrachloride, thus breaking the electrical connection.

The application discloses a silver ore oxidation rate determination method, and relates to the technical field of mineral processing and process mineralogy analysis. The determination method comprises the following steps: sample preparation and segmentation; silver grade calibration and gravity concentration enrichment to obtain products with different mineralogical characteristics; automatic mineralogical analysis to obtain the types, content and dissemination characteristics of silver minerals; chemical leaching correction coefficient determination to obtain the phase distribution of silver through ladder type chemical leaching and calculate the correction coefficient; gangue inclusion correction coefficient determination to analyze the content of residual silver and calculate the correction coefficient; and finally, based on the automatic mineralogical analysis data and the correction coefficient, the silver ore oxidation rate is calculated. Through the fusion of multiple technologies and data correction, the accuracy and reliability of the silver ore oxidation rate determination of the silver ore with low silver mineral content and uneven distribution are significantly improved, and accurate data support is provided for the development of the beneficiation process.

In various embodiments, rapid, sensitive detection of molecular hydrogen is achieved by in a detector that divides sample gas into two flows by dividing the sample gas before dampening variation and converting hydrogen to water vapor at two different points. For example, a detector may receive sample gas that includes ambient water vapor and hydrogen, divide the sample gas into a chemical conversion flow and bypass flow, perform a first chemical conversion of hydrogen in the chemical conversion flow to water vapor, alternate between drying the converted chemical conversion flow or the bypass flow to produce a modulated flow, perform a second chemical conversion of hydrogen in the modulated flow to water vapor, measure water vapor in the converted modulated flow to produce a water vapor signal, separate the water vapor signal in the time domain to extract a hydrogen-derived water vapor signal, and output a hydrogen signal based thereon.

An object is to provide a flow analyzer which makes it possible to, without carrying out a complicated pretreatment, analyze mercury and analyze a sample containing mercury with accuracy equivalent to that of a conventional method. The object is attained by a flow analyzer including a sample introduction section (1), a reagent introduction section (3), and an analysis section (4), the flow analyzer further including: a heating section (5) that carries out a heat treatment with respect to a sample to which a reagent has been added; a cooling section (6) that cools the sample which has been subjected to the heat treatment and which is transferred inside a tube; and a gas-liquid separation section (7) that removes gas which is present in the tube after cooling.

An object is to provide a flow analyzer which makes it possible to, without carrying out a complicated pretreatment, analyze mercury and analyze a sample containing mercury with accuracy equivalent to that of a conventional method. The object is attained by a flow analyzer including a sample introduction section (1), a reagent introduction section (3), and an analysis section (4), the flow analyzer further including: a heating section (5) that carries out a heat treatment with respect to a sample to which a reagent has been added; a cooling section (6) that cools the sample which has been subjected to the heat treatment and which is transferred inside a tube; and a gas-liquid separation section (7) that removes gas which is present in the tube after cooling.

Process and kit for detecting the presence of at least one metal, in particular copper, in hair fibres, comprising bringing the hair fibres into contact with a test composition comprising, in aqueous medium at alkaline pH, at least one ammonium salt, and hydrogen peroxide, so as to enable the generation of a possible evolution of dioxygen gas at the surface of the hair fibres, the presence of such an evolution of gas revealing the presence of said metal in the hair fibres. In addition, a process and kit is disclosed for revealing undesirable colouring residues in hair fibres, by bringing, in a container, sampled hair fibres at a temperature greater than ambient temperature into contact with either (a) an aqueous, alkaline composition comprising 2-15 weight% of an oxidizing agent, or (b) an extraction solvent for observing a possible colouring thereof.

A gas-liquid separator (50) comprises: a receiving port (51a) to which a sample is supplied; a gas feed pipe (51, 52) for feeding gas in the sample supplied to the receiving port (51a) to the outside; a storage pipe (53) for storing liquid in the sample supplied to the receiving port (51a); and a waste liquid port (54a) for discarding liquid stored in the storage pipe (53) to the outside. The storage pipe (53) includes: a first storage portion (53a) which communicates with the receiving port (51a) and which is disposed in a region vertically below the receiving port (51a); a second storage portion (53b) which communicates with the waste liquid port (54a) and which is disposed in a region vertically below the waste liquid port (54a); and a communicating portion (53c) which provides communication between a vertically lower end portion of the first storage portion (53a) and a vertically lower end portion of the second storage portion (53b).

The present invention relates to a direct method for the quantification of sodium in crude oil residues, such as atmospheric residues and vacuum residues by flame atomic absorption spectrometry (FAAS). The proposed method has application in the analysis of sodium in RAT, RV and more frequent oils for monitoring the efficiency of desalting in refineries and the effects of residual salt in other refining processes.

The invention relates to a useful method for detecting and / or quantifying any noble metal on the surface of an indium phosphide (InP) substrate, comprising at least the following steps: a) contacting the InP of said substrate with an iodine solution further comprising at least one non-iodine oxidizing agent other than hydrogen peroxide for dissolving said noble metal, if present, in said solution; b) recovering said solution having been carried out in a); c) where appropriate, repeating a) and b) with an iodine solution free of noble metal; and d) analyzing by inductively coupled plasma mass spectrometry the solution recovered in b), and where appropriate in c).

Method for detecting the presence of at least one metal, particularly copper, in hair fibers, comprising contacting the hair fibers with a test composition comprising, in an aqueous medium at alkaline pH, at least one ammonium salt and hydrogen peroxide, so as to allow the formation of possible oxygen gas on the surface of the hair fibers, the presence of such gas revealing the presence of said metal in the hair fibers. Figure for the abstract: Fig. 1

An object is to provide a flow analyzer which makes it possible to, without carrying out a complicated pretreatment, analyze mercury and analyze a sample containing mercury with accuracy equivalent to that of a conventional method. The object is attained by a flow analyzer including a sample introduction section (1), a reagent introduction section (3), and an analysis section (4), the flow analyzer further including: a heating section (5) that carries out a heat treatment with respect to a sample to which a reagent has been added; a cooling section (6) that cools the sample which has been subjected to the heat treatment and which is transferred inside a tube; and a gas-liquid separation section (7) that removes gas which is present in the tube after cooling.

Systems and methods for generating a plurality of data points for total organic carbon ("TOC") analysis of an active flow system are disclosed. The TOC device comprises a sample fluid channel, a flow control device, a conductivity sensor and an oxidation device, wherein the flow control device, the conductivity sensor and the oxidation device are located at the sample fluid channel. A controller operates the flow control device to generate a flow of sample fluid through the sample fluid channel at a first non-zero flow rate when the oxidation device is activated, obtains a measurement of the sample fluid from the conductivity sensor, the flow control device is operated upon activation of the oxidation device to generate a further flow of the sample fluid through the sample fluid channel at a second non-zero flow rate, to acquire a further measurement of the sample fluid from the conductivity sensor, and to generate a delta conductivity measurement from the measurement.

An embodiment provides a method for measuring an amount of total organic fluoride content of a PFAS containing sample, including: placing a sample comprising a PFAS compound in a measurement device, wherein the measurement device comprises an oxidation cell and a non-oxidation cell, wherein the oxidation cell comprises a boron-doped diamond electrode; measuring, using the measurement device, an amount of total inorganic fluoride of the sample before an oxidation; applying an electrical potential to a portion of the sample in the oxidation cell, wherein the electrical potential oxidizes the PFAS compound; measuring, using the measurement device, an amount of total organic fluoride of the sample after the oxidation to provide a measurement signal of the total organic fluoride; and determining a first derivative of the measurement signal of the total organic fluoride. Other aspects are described and claimed.

The present invention relates to a method of physico-chemical analysis of a gas sample comprising a carrier gas in which chlorine gas is diluted, the physico-chemical analysis method comprising: a) a step of converting the chlorine of the gas sample into chlorine dioxide in a conversion vial; b) a step of acquiring an absorption spectrum of the gas sample after carrying out step a) in a measurement cell which is fluidically connected to the conversion vial; and c) a step of mathematically processing the absorption spectrum with a view to deducing the concentration of chlorine dioxide in the gas sample therefrom.

The invention relates to the technical field of vehicle chassis testing, in particular to a method for detecting weather resistance of a carbon nano composite anti-corrosion and anti-collision material for a vehicle chassis. The method comprises the following steps: dividing a chassis infrared image into sub-regions, selecting a heat concentration region according to the temperature saliency and shape characteristics of the sub-regions, and taking the rest regions as normal aging regions; dividing the normal aging area into local areas, and obtaining oxidation values of the local areas according to color changes and oxygen-containing group changes of actual areas, corresponding to the local areas, of the surface of the sample before and after the aging test; and determining the actual elastic modulus of the local area based on the oxidation value, determining the mechanical property reduction degree according to the difference of the actual elastic modulus of different local areas in the chassis infrared image, and carrying out weather resistance detection on the vehicle chassis sample. According to the method, the heat concentration area is removed, the mechanical property reduction degree is analyzed through the oxidation degree of the normal aging area, then the weather resistance is evaluated, and the accuracy of weather resistance detection is improved.

Provided are a total organic carbon measurement method and a total organic carbon measurement device capable of determining whether or not an acid has been added to a sample. An acid is introduced into a reaction unit in which the sample is placed from a reservoir in which the acid is reserved (step S103). The conductivity of the sample into which the acid has been introduced is measured (step S105). The introduction of the acid from the reservoir into the reaction unit is detected on the basis of a change in the conductivity of the sample (step S107).

Systems and methods for generating multiple data points for total organic carbon ("TOC") analysis of an actively flowing system are disclosed. A TOC device includes a sample fluid passageway and a flow control device, conductivity sensor(s), and an oxidation device located at the sample fluid passageway. A controller operates the flow control device to cause a flow of sample fluid through the sample fluid passageway at a first non-zero flow rate while the oxidation device is active, takes measurement(s) of the sample fluid from the conductivity sensor(s), operates the flow control device to cause a further flow of the sample fluid through the sample fluid passageway at a second non-zero flow rate while the oxidation device is active, and takes further measurement(s) of the sample fluid from the conductivity sensor(s), and generates delta conductivity measurements from the measurements.

Continuous glucose monitoring (CGM) may include applying a periodic excitation signal via an electrode of a CGM sensor to human interstitial fluid to drive an oxidation / reduction reaction, and measuring the current through the electrode. In some embodiments, the measured current is sampled and digitized, and various harmonics of the excitation signal's fundamental frequency are extracted. A set of relationships of at least two harmonics each is generated from the spectral amplitudes of a set of pairs, triplets, etc.,of the harmonics, and the set of relationships is mapped to a glucose concentration such as based on the contents of a harmonic relationship database having a pre-existing set of harmonic relationships and glucose concentrations to which those sets of harmonic relationships correspond, for example. Numerous other embodiments are provided.

An embodiment provides a method for deriving an alkalinity measurement, including: introducing a fluid sample; measuring, a phosphate amount of the fluid sample using a colorimetric reagent; measuring a pH of the fluid sample, wherein the pH of the fluid sample correlates to a hydroxide amount of the fluid sample; introducing an acid to convert all the inorganic carbon to carbon dioxide; applying a positive potential to the SP3 substituted carbon electrode; introducing, prior to or substantially simultaneously during the application of the positive potential to the SP3 substituted carbon electrode and in the reaction chamber, at least one acid reagent comprising a metallic catalyst that converts the carbonate and the partially oxidized species to carbon dioxide; determining total organic carbon by detecting an amount of carbon dioxide produced by the oxidation; determining the total organic carbon from the oxidation of the organic carbon species, and determining a derived alkalinity based upon the phosphate amount, the hydroxide amount, and the amount of carbon dioxide generated from the inorganic carbon. Other aspects are described and claimed.

In order to provide an elemental analysis device whereby an electrode tip is made replaceable, but air can be prevented from becoming trapped inside the electrode during replacement, and whereby error in elemental analysis can be reduced, the present invention is an elemental analysis device 100 in which a crucible MP containing a sample is held between a first electrode 31 and a second electrode 32, and an electric current is passed between the first electrode 31 and the second electrode 32, thereby heating the sample, wherein the second electrode 32 comprises a second electrode body 32B provided with a substantially cylindrical distal-end part, a second electrode tip 32C provided to the distal-end surface of the second electrode body 32B, a cap 32D which holds the second electrode tip 32C between the second electrode body 32B and the cap 32D in a state in which a portion of the second electrode tip 32C is exposed to the outside, and a second screwing structure 32S comprising a male threaded part S1 and a female threaded part S2 formed between the second electrode body 32B and the cap 32D, the second screwing structure 32S further comprising a gas venting groove 321 which extends in the pitch direction in the male threaded part S1 and / or the female threaded part S2 and is formed by cutting off a portion of the screw threads.

This invention provides a system and method for detecting the oxidation stability of phosphate ester fire-resistant oil. The system includes a pressure vessel cavity for holding a sample bottle containing phosphate ester fire-resistant oil. The pressure vessel cavity is housed within a constant-temperature heating device. The sample bottle is placed into the pressure vessel cavity through a first opening, which is sealed by a sealing ring and a pressure vessel top cover. A second opening of the pressure vessel cavity is connected to an oxygen injection device via a pipe. A pressure sensor is installed within the pressure vessel cavity. A third opening of the pressure vessel cavity is open to the atmosphere. The constant-temperature heating device, pressure sensor, oxygen injection device, and single-arm composite robot are all connected to a detection and control system. This system can accurately detect the oxidation stability of phosphate ester fire-resistant oil without requiring any chemical reagents, offering advantages such as environmental friendliness, increased efficiency, and labor savings.

The present invention relates to a method for treating excavated soil spoil from underground development, comprising a step of determining the iron disulfide, FeS2, content and the carbonate content in the spoil.

An embodiment provides a method, for measuring ozone in a sample, including: introducing at least one alkene to a sample, wherein the alkene in the presence of an amount of ozone produces a carbonyl solution; adding 3-methyl-2- benzothiazolinonehydrazone hydrochloride (MBTH) to the carbonyl solution, and thereafter adding an oxidant to produce at least one imine and oxidized MBTH; producing a conjugated indicator from a reaction of the at least one imine and the oxidized MBTH; and measuring, using a colorimetric technique, an amount of ozone. Other aspects are described and claimed.

This invention discloses a method for determining the spontaneous combustion tendency of coal based on the oxygen consumption rate integral. A new spontaneous combustion characteristic parameter, the oxygen consumption rate integral, is proposed. This integral comprehensively reflects the spontaneous combustion characteristics of coal during the latency period and the influence of low oxygen concentration (0-20.96%) on coal spontaneous combustion. A new coal spontaneous combustion tendency index, the aerobic rate integral, is proposed. The magnitude of the oxygen consumption rate integral can intuitively reflect the spontaneous combustion tendency of coal, thus quantifying it. The larger the oxygen consumption rate integral, the stronger the spontaneous combustion tendency of the coal.

The invention relates to a system and a method for determining the concentration of an analyte in a carrier gas of a quasi-binary or binary mixed gas. The system comprises an electrochemical gas sensor, the electrochemical gas sensor having a working electrode and a counter electrode, the electrochemical gas sensor being configured to oxidize and / or reduce the analyte by means of the working electrode and to reduce and / or oxidize at least one component of the carrier gas, and providing a corresponding measurement signal. The system further comprises a memory unit in which calibration information for the mixed gas is stored, and a data processing unit which is configured to receive the measurement signal, receive the calibration information, and process the calibration information. Determining a concentration of the analyte in the carrier gas from the measurement signal and from the calibration information, and providing the determined concentration of the analyte in the carrier gas.

The purpose of the present invention is to provide an analysis method whereby a mercury-containing sample can be analyzed with high accuracy, for example, by ICP-MS. The method for analyzing a mercury-containing sample comprises: a pretreatment step for preparing a sample solution by adding an oxidizing agent to a mercury-containing sample so as to form an oxidized state with an oxidation-reduction potential of + 0.80 V or more; and an analysis step for quantitatively analyzing or qualitatively analyzing the sample solution prepared in the pretreatment step while keeping the sample solution in an oxidized state.

An embodiment provides a method for measuring ozone in a sample, including: introducing at least one alkene to a sample, wherein the alkene in the presence of an amount of ozone produces a carbonyl solution; adding 3-methyl-2-benzothiazolinonehydrazone hydrochloride (MBTH) to the carbonyl solution, and thereafter adding an oxidant to produce at least one imine and oxidized MBTH; producing a conjugated indicator from a reaction of the at least one imine and the oxidized MBTH; and measuring, using a colorimetric technique, an amount of ozone. Other aspects are described and claimed.