31results 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.

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.

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.

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.

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.

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.

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.

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 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.

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).

The application discloses a device for in-situ determination of iron ammonia oxidation rate of tidal estuary sediment and overlying water, comprising: a bottomless hollow experimental bin, the lower part of which is arranged in the sediment, the upper part of which is immersed in the overlying water, the top of which is provided with an exhaust port closed by a sliding cover, the outside of which is provided with a liquid injection device, the injection port being in the experimental bin, the outside of which is further provided with a helium gas channel, the outlet of the channel being arranged at the interface between the sediment and the overlying water in the experimental bin, the upper part of which is provided with an overlying water sampling port connected with an overlying water sampler outside, the lower part of which is provided with a pore water sampling port connected with a pore water sampler through a hose, and the upper part of which is further provided with a plurality of probes in communication connection with a signal receiver. The application has strong applicability, simple operation, can realize in-situ synchronous determination of iron ammonia oxidation rate of tidal estuary sediment and overlying water, and has high practical value and broad popularization prospect for deep understanding and mastering of the iron ammonia oxidation process of the tidal estuary rich in nitrogen and iron.

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.

Continuous glucose monitoring (CGM) can involve applying a periodic excitation signal to human interstitial fluid via electrodes of a CGM sensor to drive an oxidation / reduction reaction and measuring the current through the electrodes. In some embodiments, the measured current is sampled and digitized to extract various harmonics of the fundamental frequency of the excitation signal. A set of relationships for each of at least two harmonics is generated from the spectral amplitudes of a set of harmonic pairs, triplets, etc., and the relationship sets are mapped to glucose concentrations, e.g., based on the contents of a harmonic relationship database having existing harmonic relationship sets, and the harmonic relationship sets are mapped to corresponding glucose concentrations. Many other embodiments are provided.

The invention relates to the technical field of isotope analysis, and discloses an isotope analysis reaction device which comprises a bottom plate and a vortex oscillator body, a top plate is slidably mounted at the top of a vertical rod, a stabilizing assembly is arranged at the top of the bottom plate, an adjusting assembly is arranged below the top plate, and the stabilizing assembly comprises a limiting unit and a fixing unit. The limiting unit comprises vertical plates symmetrically and fixedly mounted at the top of the bottom plate, transverse rods are transversely and fixedly connected to the interiors of the vertical plates, and through cooperation of the transverse rods in the limiting unit and the top plate, when the reaction chamber is subjected to oscillation in different directions, downward pulling force can be provided for the top plate; therefore, the reaction chamber and the marking bottle can be stably pressed and positioned, the stable limiting effect can be kept no matter which direction the reaction chamber and the marking bottle suffer from oscillation, and through cooperation of a moving rod and a piston in the fixing unit, when the reaction chamber and the marking bottle suffer from oscillation in different directions, the negative pressure state of the adsorption tank can be further improved, and the stability of the reaction chamber and the marking bottle is improved. Therefore, the stability of the device during oscillation is improved.

A system and a method for determining a concentration of an analyte in a carrier gas of a quasi-binary or binary gas mixture are provided. The system comprise an electrochemical gas sensor. The electrochemical gas sensor comprises a working electrode and a counter electrode. 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 comprises a memory unit in which calibration information for the gas mixture is stored, and a data processing unit which is configured 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, provide the determined concentration of the analyte in the carrier gas.

There is provided an analysis system configured such that a composition ratio after oxidation decomposition is unlikely to change in association with the temperature of heating of a reaction tube. In an analysis system (1) including an oxidation decomposition device (6) having an inlet (33) and an outlet (35) and configured to oxidatively decompose a sample introduced through the inlet (33) to discharge the sample through the outlet (35), the oxidation decomposition device (6) includes a reaction tube (30) having one end and the other end such that the one end is arranged on the inlet (33) side and the other end is arranged on the outlet (35) side and configured to oxidatively decompose the sample inside, a heating furnace (28) housing the reaction tube (30) therein and configured to heat the reaction tube (30), an oxidation gas supplier (36) configured to supply oxidation gas for oxidizing the sample, a makeup gas supplier (38) configured to supply makeup gas which is inert gas not influencing oxidation decomposition of the sample, and an interface (32) having a structure of introducing the oxidation gas supplied from the oxidation gas supplier (36) and the makeup gas supplied from the makeup gas supplier (38) into the reaction tube (30) together with the sample introduced through the inlet (33).

An inspection apparatus includes a measurement unit, a flow-in tube for flow of sample water into the measurement unit, a connection portion that connects a sample tube and the measurement unit to each other, a liquid sending portion that sends sample water to the measurement unit, a pressurization pump that increases a pressure in the inside of the sample tube, and a controller. The controller controls operations of the liquid sending portion and the pressurization pump to suppress within a prescribed range, variation in pressure applied to sample water until sample water reaches the measurement unit from the inside of the sample tube.

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.

System and method for calibrating and 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, the electrochemical gas sensor having 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 present invention provides a measurement method that enables general-purpose quantitative analysis capable of quantifying all nitrogen / carbon-containing compounds contained in water with a calibration curve based on a single compound. In addition, the invention provides a direct, inexpensive, rapid, and simple method for measuring cyanide in water by spectrophotometry or electrical conductivity measurement. The measurement method for nitrogen / carbon-containing compounds is a method for measuring a compound containing at least one element selected from the group consisting of nitrogen and carbon. The method comprises: a photoreaction step of irradiating an aqueous solution containing the nitrogen / carbon-containing compound with light having a wavelength of 190 nm or less to generate analyte ions; and a measurement step of measuring the analyte ions. The analyte ions are at least one ion selected from the group consisting of nitrate ions, nitrite ions, and carbonate ions.

A simplified reagent system for the analysis of arsenic in an acidic aqueous environment is disclosed. In accordance with the inventive technology, a two reagent system is provided. The first reagent includes a combination of an acidifying agent and an oxidizing agent, and is in particulate form. The second reagent is zinc in particulate form, and is beneficially used in the analysis in the presence of an effective amount of an agent for increasing the rate of arsine gas production.