49results 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.

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

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 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.

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.

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.

A useful method for detecting and / or quantifying any noble metal on the surface of an indium phosphide (InP) substrate. 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 carried out in a); c) where applicable, repeating a) and b) with an iodine solution free of noble metal; and d) analyzing the solution recovered in b), and where applicable in c), by inductively coupled plasma mass spectrometry. Figure for the abstract: None

For the purpose of providing an analysis method that makes it possible to use, for example, ICP-MS to analyze, with high accuracy, a sample containing mercury, a method for analyzing a sample containing mercury includes: a pretreatment step of adding an oxidizer to a sample containing mercury to prepare a sample solution so as to achieve an oxidation state in which an oxidation-reduction potential is not less than +0.80 V; and an analysis step of subjecting the sample solution which has been prepared in the pretreatment step to a quantitative analysis or a qualitative analysis while maintaining the oxidation state.

The invention provides a method for improving the oxidation-reduction performance of manganese oxide through grain boundary enrichment of Fe. The method comprises the following steps: preparing Fe grain boundary enriched and Fe body doped ferromanganese oxide; representing microtopography and crystal structures of the two samples based on a scanning electron microscope, a transmission electron microscope and X-ray radiation; measuring the oxidation-reduction performance of the two samples through a synchronous thermal analyzer; based on a first principle of a density functional theory, calculating electronic structure properties and reaction transition states of the two samples; comparing and analyzing electronic structures, microtopographies, crystal structures and redox properties of the two samples, and clarifying a mechanism of enhancing the redox properties by the electronic structure properties; based on the mechanism, a low-energy-consumption and high-performance synthetic route for physically mixing commercial manganese oxide and iron oxide is developed. According to the invention, a mechanism for improving the performance of the manganese oxide by Fe is disclosed through a modification strategy induced by two different electronic structures, and a low-energy-consumption and large-scale synthesis route is established.

The present invention relates to a system and method for determining the concentration of an analyte in a carrier gas of a quasi-binary or binary gas mixture. The system comprises an electrochemical gas sensor, wherein the electrochemical gas sensor has a working electrode and a counter electrode, wherein the electrochemical gas sensor is configured by means of the working electrode to oxidize and / or reduce the analyte and to reduce and / or oxidize at least one component of the carrier gas and to provide a corresponding measurement signal.The system further includes a storage unit in which calibration information for the gas mixture is stored, and a data processing unit which is set up to: receive the measurement signal, receive the calibration information, determine the concentration of the analyte in the carrier gas from the measurement signal and from the calibration information, and provide the determined concentration of the analyte in the carrier gas.

The invention discloses a device for in-situ determination of the iron ammonia oxidation rate of tidal estuary sediments and overlying water, which comprises a bottomless hollow experiment bin, the lower part of the experiment bin is arranged in the sediments, the upper part of the experiment bin is immersed in the overlying water, the top of the experiment bin is provided with an exhaust port sealed by a sliding cover, the outside of the experiment bin is provided with a liquid injection device, and an injection port is arranged in the experiment bin; a helium channel is arranged outside the experimental chamber, an outlet of the channel is arranged at the interface of sediment and overlying water in the experimental chamber, the upper part of the channel is provided with an overlying water sampling port and an overlying water sampler connected outside the channel, and the lower part of the channel is provided with a pore water sampling port and is connected with the pore water sampler through a hose; and a plurality of probes in communication connection with the signal receiver are also arranged in the upper part. The method is high in applicability and simple to operate, can realize in-situ synchronous determination of the iron ammonia oxidation rate of the tidal estuary sediments and the overlying water, and has a relatively high practical value and a wide popularization prospect for deeply understanding and mastering the iron ammonia oxidation process of the tidal estuary with relatively rich nitrogen and iron.