35 results about "Optical emission spectrometry" patented technology

The present invention provides: a steel sheet which contains Ni, Cu and Sn, and has excellent chemical conversion treatability; and a component which includes said steel sheet.　A steel sheet and a component including the same according to the present invention are characterized by having a chemical composition containing, in mass %, 0.010-1.000% of Ni, 0.010-1.000% of Cu, and 0.003-1.000% of Sn, and by the emission intensities of Ni, Cu, and Sn in the surface layer of the steel sheet as measured by high-frequency glow discharge optical emission spectrometry satisfying the following relationships.　Ni: Surface layer maximum intensity / Bulk intensity ≤ 1.5 Cu: Surface layer maximum intensity / Bulk intensity ≤ 1.3 Sn: Surface layer maximum intensity / Bulk intensity ≤ 15

A surface-treated steel sheet including: a steel sheet; and a nickel-cobalt-iron diffusion layer formed on the steel sheet as an outermost layer. When the intensities for Ni, Co and Fe are consecutively measured from a surface of the nickel-cobalt-iron diffusion layer in the depth direction by radio frequency glow discharge optical emission spectrometry, and the concentration of Ni, Co and Fe at each of depth positions are determined based on the intensities for Ni, Co, and Fe, a Co concentration gradient ΔPCo ranging from a depth position DCo_MAX to a depth position DCo_15% is 33% by mass / 0.1 μm or less. A depth position at which the concentration of Co is maximum is defined as DCo_MAX and a depth position located closer to the steel sheet than the depth position DCo_MAX and at which the concentration of Co is 15% of the maximum value is defined as DCo_15%.

The invention discloses a method for simultaneously determining total barium and sulfur in barite by inductively coupled plasma emission spectrometry. In this method, the sample is decomposed by melting with sodium carbonate and sodium hydroxide. The molten slag is extracted with hot water, nitric acid and a chromium internal standard solution are added, the crucible and the beaker are washed with dilute hydrochloric acid, water is added and shaken well, heated to boiling gently on a hot plate and then taken off and shaken well. After cooling, it is determined on an inductively coupled plasma emission spectrometer. The method of the invention makes use of the characteristic that barium sulfate has a relatively large solubility in reverse aqua regia, enabling barium and sulfur to coexist stably, and then simultaneously determines total barium and sulfur by inductively coupled plasma emission spectrometry, which has the characteristics of high detection efficiency, high precision, simple operation and low cost, and solves the technical problems that when determining total barium and sulfur in barite by traditional methods, sulfur and barium are difficult to coexist in the solution, usually two different methods are required to complete the determination, and even barium and sulfur need to be separated in advance, resulting in a long process and low detection efficiency.

A galvanized steel sheet for hot stamping in which the component composition of a base steel sheet satisfies the following conditions: 0.15-0.50% by mass of C, 0.02-2.5% by mass of Si, 0.5-5% by mass of Mn, 0.03% by mass or less (including 0% by mass) of P, 0.02% by mass or less (including 0% by mass) of S, 0.010-1% by mass of Al, 0.005-0.080% by mass of Ti, and 0.0005-0.005% by mass of B, with the remainder being Fe and unavoidable impurities, and when elemental analysis is performed from the surface of a plating layer in the thickness direction of the plating layer by glow discharge emission spectroscopy (GD-OES), the content of Si in the plating layer in the thickness direction of the plating layer is less than 1% by mass. The carbon concentration [Cf] (mass%) at a position where the Zn concentration constituting the plating layer is 1.0 mass% and the bulk carbon concentration [Cb] (mass%) satisfy formula (1): [Cf] < = 0.65 [Cb].

This SiAlON powder satisfies at least one of the following (1) and (2). (1) The powder is Cam / 2Si12-(m+n)Al(m+n)OnN16-n, in which m is less than 1.0. (2) The value of Ca / (Si+Al) determined by inductively coupled plasma (ICP) optical emission spectrometry is less than 0.0595.

The invention discloses a method for testing available boron in soil by ultrasonic extraction plasma emission spectrometry, which comprises the following steps: weighing 10.0 g of air-dried soil sample passing through a 60-mesh sieve, adding 20.0 mL of first-grade water (conforming to the GB / T 6682 regulation) into a 100 mL polyethylene centrifuge tube, slightly shaking the polyethylene centrifuge tube to disperse the soil, preferably performing ultrasonic extraction for 20-25 minutes under the conditions of 40 kHz and 70-80 DEG C, and performing ultrasonic extraction for 20-25 minutes under the conditions of 40 kHz and 70-80 DEG C; more preferably, after 22 minutes of extraction is finished, centrifuging for 5 minutes at the speed of 4000 r / min, collecting supernate, putting the supernate into a colorimetric tube to be detected, putting the supernate on a machine, selecting boron of 249.773 nm as an analysis spectral line, and detecting the soil available boron by an inductively coupled plasma emission spectrometry (ICP-OES) method, the mass concentration of the soil available boron is in a range of 0-2.0 mg / L and has a good linear relationship with spectral intensity, the correlation coefficient is 0.9999, the detection limit of the method is 0.003 mg / kg, and the lower measurement limit is 0.012 mg / kg. The relative standard deviation RSD is 2.17%-4.73% (n is equal to 8), the relative error RE is 0.54%-2.10% (n is equal to 8), and detection values are all in an uncertainty range.

The invention relates to a method for detecting heavy metal pollution by plasma emission spectrometry, which comprises the following steps: collecting the emission spectrum of a sample in real time, identifying spectral data according to the characteristic emission wavelengths of different heavy metal elements, and drawing a standard calibration curve by taking the concentration of a standard sample as an abscissa and the spectrum peak intensity as an ordinate; the spectrum peak intensity of a sample to be detected is substituted into the standard calibration curve, the concentration of the heavy metal elements is calculated, before the emission spectrum of the sample is collected in real time, the sample is treated through discharge plasma, and if the sample is liquid, the liquid sample is adsorbed to a carrier to be treated. In the detection process, heavy metal elements can be excited by using the discharge plasma, the detection efficiency is improved, and the method is suitable for quick response application scenes. Besides, the method does not need expensive vacuum equipment or complex chemical reagents, accurate quantitative analysis of heavy metal elements can be realized through standard curve calibration, the detection precision is high, and the result is stable and reliable.

The positive electrode active material according to the present invention comprises a lithium composite transition metal oxide having a nickel content of 50-80 mol% in all metals other than lithium, and a tungsten-containing coating layer formed on the surface of the lithium composite transition metal oxide, the positive electrode active material is in the form of a single particle composed of single nodules or in the form of a quasi-single particle which is a complex of 40 or less nodules, and is pretreated under conditions in which the positive electrode active material is immersed in deionized water at 25 DEG C for 1 hour. The ratio (Li / W) of the number of moles of lithium to the number of moles of tungsten measured by inductively coupled plasma emission spectroscopy (ICP-OES) analysis satisfies the range of 30 to 45.

The application discloses a spark spectrum analysis method for the inclusion content distribution on the surface of large-size metal materials, which continuously excites and scans the surface of the large-size metal materials through spark discharge to obtain the mixed distribution data of the solid solution and inclusions of the inclusion elements on the surface of the large-size metal materials, and further obtains the relative frequency distribution graph of the spectral intensity; the relative frequency distribution graph of the spectral intensity is subjected to normal distribution and Gumbel extreme value distribution peak fitting processing to obtain the Gumbel extreme value distribution data of the spectral intensity of the inclusions; the number and size information of the inclusions of the small sample are acquired to obtain the maximum inclusion size information; the inclusion size information of the small sample and the maximum inclusion size information are associated with the spectral intensity distribution data of the inclusions to determine the corresponding relationship between the size and the spectral intensity of the inclusions, and the content distribution result of the inclusions on the surface of the large-size metal materials is obtained. The application can quickly obtain the accurate distribution information of each element inclusion on the surface of the metal materials.

The present invention relates to a computer-implemented method for automatically identifying the presence of one or more elements in a sample via optical emission spectroscopy. The method comprises the following steps: obtaining sample spectral data from the sample; obtaining a list of one or more predetermined emission wavelengths for each element in the periodic table quantifiable by optical emission spectroscopy, each predetermined emission wavelength being associated with a list of one or more potentially interfering emission wavelengths; determining a list of one or more analyte wavelengths corresponding to spectral peaks in the sample spectral data based on the list of emission wavelengths; determining, for each analyte wavelength, whether the corresponding spectral peak has a probability of being affected by an interfering emission wavelength that causes spectral interference based on the list of one or more potentially interfering emission wavelengths corresponding to the analyte wavelengths; determining a revised list of one or more analyte wavelengths by removing analyte wavelengths corresponding to spectral peaks having a probability of being affected by an interfering emission wavelength from the list of analyte wavelengths; and determining a confidence level that one or more elements are present in the sample based on a set of criteria applied to the revised list of analyte wavelengths.

The present invention provides an analytical method for introducing the boron content in a positive electrode active material. The method includes the following steps: (S1) preparing a positive electrode active material sample in which boron is introduced; (S2) separating a first liquid layer and a first precipitate by dissolving the positive electrode active material sample in water, and then analyzing the solution obtained by acid-treating the first liquid layer using inductively coupled plasma optical emission spectrometry (ICP-OES) to measure the boron concentration; (S3) separating a second liquid layer and a second precipitate by dissolving the first precipitate in water, and then analyzing the solution obtained by acid-treating the second liquid layer using ICP-OES to measure the boron concentration; and (S4) analyzing the solution obtained by adding acid and hydrogen peroxide to the second precipitate using ICP-OES to measure the boron concentration. According to the present invention, by sequentially extracting and analyzing boron introduced to improve the performance of the positive electrode active material for a lithium secondary battery using the solubility differences in water and acid according to the distribution position, the optimal boron content for improving the performance of the positive electrode active material can be obtained based on the distribution of boron in the positive electrode active material.

The present invention provides a positive electrode active material for a lithium-ion rechargeable battery, wherein the positive electrode active material contains Li, M', and oxygen, where M' contains: - Ni at x with respect to the content of M' being between 60.0 mol% and 95.0 mol%; - Co at y with respect to the content of M', where 0 < y < 40.0 mol%; - Mn at z with respect to the content of M', where 0 < z < 70.0 mol%; - D at a with respect to the content of M', where 0 < a < 2.0 mol%, where D includes elements other than Li, O, Ni, Co, Mn, F, W, and B; - F at b with respect to the content of M', where b > 0, preferably between 0.1 mol% and 4.0 mol%; - W at c with respect to the content of M' being between 0.1 mol% and 4.0 mol%; - B at e with respect to the content of M', where 0 < e < 4.0 mol%; and, - where x, y, z, a, e, and c are measured by inductively coupled plasma-optical emission spectrometry (ICP-OES), - where b is measured by ion chromatography (IC), - where x + y + z + a + b + c + e = 100.0 mol%, and where the positive electrode active material has an F content F defined by formula (I) A and a W content W defined by formula (II) A , where the positive electrode active material has an F content F B and a W content W B , where F B and W B are determined by XPS analysis, where F B and W B [[ID=I6]]are each expressed as a mole fraction compared to the sum of the mole fractions of Co, Mn, Ni, F, W, and B measured by X-ray photoelectron spectroscopy, where the ratio F B / F A = 1.0, where the ratio W B / W A > 1.0.

An optical emission spectrometer is provided. The optical emission spectrometer includes a plasma source, an optical assembly, a reference light source, and a first mirror. The plasma source is arranged to emit light. The optical assembly includes a plurality of optical components arranged to direct light traveling in a first direction from the plasma source along a first optical path to an entrance slit of the optical emission spectrometer. The reference light source is used for calibrating the spectrometer, wherein the reference light source is arranged to output reference light along a reference light path. The first reflector is arranged to selectively switch the reference light to the first light path, thereby guiding the reference light to the entrance slit for calibrating the optical emission spectrometer.

A spark stand for an optical emission spectrometer, comprising: a spark chamber; and at least one auxiliary gas conduit for providing an auxiliary gas flow into the spark chamber, wherein the at least one auxiliary gas conduit is configured to provide the auxiliary gas flow into the spark chamber for a period after spark operation but not during spark operation in which analysis of a sample takes place. The auxiliary gas flow into the spark chamber improves flushing of dust from the spark chamber after spark operation.

Disclosed is a galvannealed steel sheet including: a Si-containing cold-rolled steel sheet containing Si in an amount of 0.1 mass % or more and 3.0 mass % or less; an Fe-based electroplating layer formed on at least one surface of the Si-containing cold-rolled steel sheet; and a galvannealed layer formed on the Fe-based electroplating layer, in which in an intensity profile measured by glow discharge optical emission spectrometry, ISi,Fe / ISi,bulk is 0.30 or more, and an average value of C concentration in a region ranging from 10 μm to 20 μm in the thickness direction from the interface between the galvannealed layer and the Fe-based electroplating layer towards the Fe-based electroplating layer is 0.10 mass % or less.

A spark stand assembly for an optical emission spectroscopy includes: a spark stand body on a mounting flange enabling attaching the assembly to a main housing; an exciter in a recess on the body; an elevated portion on the body adjacent the mounting flange; an elongated notch on the body connecting the recess to a passageway through the elevated portion; a spark stand plate on the body to cover the recess, the notch and part of the elevated portion so the recess forms a plasma chamber and the notch forms a path to the passageway. The plate includes an opening exposing part of a sample on the opening for excitation, the opening being spatially aligned with the exciter when the plate is on the body; and a sealing member between the top of the body and the plate enclosing the recess and notch and routed over the elevated portion.

To prevent the occurrence of difference between the details of analysis that are automatically obtained and the details of analysis when a person conducts analysis, when automating analysis of a result of ICP emission spectral analysis measurement.SOLUTION: An analysis method for a result of ICP emission spectral analysis measurement includes: a peak wavelength preparation step; a priority setting step; a weighting step of performing weighting on an analysis value from an analysis person's subjective point of view for at least one of a plurality of peak wavelengths; an analysis value acquisition step of acquiring an analysis value in each of the plurality of peak wavelengths for each element; a grouping step of grouping the plurality of peak wavelengths into groups having the analysis values close to each other; a group selection step of selecting the most weighted group in the entire groups in the weighting step; a peak wavelength selection step of selecting the peak wavelength having the highest priority among the peak wavelengths in the group selected in the group selection step; and an analysis value determination step of adopting the analysis value corresponding to the selected peak wavelength.SELECTED DRAWING: Figure 1

The present invention provides: a surface-treated titanium material which is used for adhesive bonding and with which it is possible to further improve bondability; and a bonded body which includes the surface-treated titanium material. Provided is a surface-treated titanium material in which a silane film is provided on at least a part of the surface of a titanium base material, wherein when element distribution is measured by glow discharge optical emission spectrometry with respect to a region R1 on the outermost surface and a region R2 at a depth of 10 nm from the region R1 in a region in which the silane film is provided, the atomic concentration of silicon in the region R1 is 3.0 atom% to 30.0 atom% inclusive. The decrease rate M of the silicon concentration is 50% or more as calculated by formula (1) on the basis of the atomic concentration A1 of silicon in the region R1 and the atomic concentration A2 of silicon in the region R2. (1): M = ((A1 – A2) / A1) × (100)

The invention relates to the technical field of pharmaceutical analysis, in particular to an ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometry) detection method for the content of carbomer in cyclosporine eye drops. The method comprises the following steps: fully dissociating carboxylic acid groups of carbomer under alkaline conditions, carrying out metering reaction on the carboxylic acid groups and added calcium ions, detecting the content of residual calcium elements in a solution after the reaction through ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry), and carrying out back calculation by combining with a metering relationship between the calcium ions and carbomer, so as to obtain the content of carbomer in the cyclosporine eye drops. Compared with an existing titration method, the method is easy and convenient to operate, high in detection efficiency and good in repeatability and accuracy, can effectively adapt to complex matrix systems such as cyclosporine eye drops and the like, and has good industrial application value.

Title: Method for mapping and analyzing at least one element of interest and associated device. The invention relates to a method for mapping and analyzing at least one element of interest contained in a sample (150) by optical emission spectrometry on a laser-produced plasma (160), comprising: - a step of producing a plasma (160) by focusing a laser beam (120) onto a surface of the sample (150); - a step of collecting optical emission from the plasma (160), defining an intensity signal; - a step of processing and analyzing the optical emission; and - characterized in that, during the processing and analysis step, the intensity signal is studied over its entire duration to identify a maximum intensity value. Figure for the abstract: Fig. 2

A method of characterizing a plasma in a plasma processing system that includes: generating a pulsed plasma in a plasma processing chamber of the plasma processing system, the pulsed plasma being powered with a pulsed power signal, each pulse of the pulsed plasma including three periods: a overshoot period, a stable-ON period, and a decay period; performing cyclic optical emission spectroscopy (OES) measurements for the pulsed plasma, the cyclic OES measurements including: obtaining first OES data during one of the three periods from more than one pulses of the pulsed plasma; and obtaining a characteristic of the pulsed plasma for the one of the three periods based only on the first OES data.

To provide a steel component with a sufficiently reduced friction coefficient.SOLUTION: A steel component comprises a surface quench-hardened layer, with a chemical composition, by mass%, containing C: 0.30-0.70%, Si: 0.15-1.00%, Mn: 0.30-1.00%, P: 0.030% or less, S: 0.025% or less, Cr: 0.90-2.00%, Al: 0.005-0.100%, N: 0.0250% or less, O: 0.0050% or less, Cu: 0.10-0.50%, and Ni: 0.05-2.00%, with the remainder comprising Fe and impurities. In the chemical composition of the steel component, the internal CuNi concentration Tc, defined as the sum of Cu and Ni contents, and the surface CuNi concentration Ts, defined as the sum of Cu and Ni concentrations in the region from the surface to a depth of 10 nm, in a depth direction elemental concentration profile obtained by glow discharge optical emission spectrometry from the surface of the steel component toward the depth direction of the steel component, satisfy the following expression: Ts / Tc≥0.60 (1).SELECTED DRAWING: None

The invention provides a method for controlling loss of bottom layer AlGaN in an etching process. The method comprises the following steps: (1) a pretreatment process: pre-cleaning an etching cavity; (2) an initialization process: a to-be-etched wafer is placed on an electrostatic chuck in the etching cavity, the temperature of the electrostatic chuck is a preset value, the to-be-etched wafer comprises a GaN layer and an AlGaN layer, and the thickness of the AlGaN layer is a first thickness; and (3) a two-step etching process: the wafer to be etched is etched step by step in combination with an optical emission spectrometry to obtain a target wafer, the thickness of the AlGaN layer on the target wafer is a second thickness, and the difference value between the second thickness and the first thickness is smaller than or equal to a loss threshold value. According to the method, the loss amount of AlGaN on the bottom layer of the wafer can be controlled through a simple technological process.

A secondary battery includes a positive electrode including a positive electrode active material, a negative electrode, and an electrolytic solution. The positive electrode active material includes a lithium composite oxide of a layered rock-salt type. The lithium composite oxide includes lithium, cobalt, aluminum, magnesium, an additional element, and oxygen as constituent elements. The additional element includes at least one of fluorine, phosphorus, or sulfur. According to an analysis of the positive electrode active material by inductively coupled plasma optical emission spectrometry, a content of aluminum is greater than a content of magnesium. According to an analysis of a surface of the positive electrode active material by X-ray photoelectron spectroscopy, a sum of an abundance of chemical bonds between magnesium and oxygen and an abundance of chemical bonds between magnesium and the additional element is greater than a sum of an abundance of chemical bonds between aluminum and oxygen and an abundance of chemical bonds between aluminum and the additional element.

Disclosed is an Fe-based electroplated steel sheet including: a Si-containing cold-rolled steel sheet containing Si in an amount of 0.1 mass % or more and 3.0 mass % or less; and an Fe-based electroplating layer formed on at least one surface of the Si-containing cold-rolled steel sheet with a coating weight per surface of 5.0 g / m2 or more, in which in an intensity profile measured by glow discharge optical emission spectrometry, a peak of emission intensity at wavelengths indicating Si is detected within a range from a surface of the Fe-based electroplating layer to more than 0.2 μm in a thickness direction and not more than a thickness of the Fe-based electroplating layer, and an average value of C concentration in a region ranging from 10 μm to 20 μm in the thickness direction from the surface of the Fe-based electroplating layer is 0.10 mass % or less.

Provided are: a synthetic fiber treatment agent that is capable of improving the flexibility of a synthetic fiber to which the synthetic fiber treatment agent is applied, particularly the flexibility of a twisted yarn or a cord using the synthetic fiber, and capable of reducing fluff; and a synthetic fiber. A synthetic fiber treatment agent according to the present invention is characterized by comprising a prescribed tertiary alkanolamine (A), a smoothing agent (B), and an organic phosphoric acid ester compound (C) which is at least one selected from organic phosphoric acid esters and salts thereof, and is characterized in that the mass ratio Ma / Mp of the content Ma of the tertiary alkanolamine (A) to the content Mp of phosphorus detected by ICP optical emission spectrometry is 6 or more.

The application discloses a kind of carbonate geological sample carbonate combined state chlorine extraction test methods, using deionized water to wash carbonate geological sample to no chlorine ion, after sample drying, add acetic acid solution to dissolve, obtain dissolving solution;Dissolving solution is added in cation exchange resin, and the solution after exchange is collected;10ppm In internal standard is added in the solution collected after resin exchange, the chlorine ion content in solution is detected using inductively coupled plasma mass spectrometry;Dilute dissolving solution using dilute nitric acid solution, use inductively coupled plasma optical emission spectrometry to detect the calcium magnesium content in dilution solution liquid, calculate carbonate combined state chlorine value, i.e. Cl / Ca value or Cl / (Ca+Mg) value.The application is washed by deionized water Sample, acetic acid dissolves sample, ICP-MS, ICP-OES detects solution element content, not only can effectively extract, test carbonate combined state chlorine in carbonate geological sample, avoid the pollution of non-carbonate mineral chlorine, also have the characteristics that experimental reagent is easy to obtain, simple operation, detection precision is high.

The invention relates to the technical field of elemental analysis and detection, in particular to a method for detecting impurity elements in chemicals and application of the method. The method for detecting the impurity elements in the chemicals comprises the following steps: preparing to-be-detected chemicals into a to-be-detected chemical solution; respectively mixing the to-be-tested chemical solution with the standard substance series solution, and carrying out plasma emission spectrum test to obtain response intensity of each inorganic element under different analysis spectral lines; wherein the standard substance series solutions comprise standard substance solutions with different concentrations and blank sample solutions, and the concentrations of inorganic elements in the standard substance solutions with different concentrations are different; according to the detection results of the plasma emission spectrum test, respectively constructing standard curves for reflecting the response intensity and the concentration of each inorganic element under different analysis spectral lines, and obtaining the concentration of the impurity elements in the chemical solution to be detected according to the standard curves. The detection method provided by the invention has the advantages of low impurity element detection limit and high detection speed.

The invention relates to stable cell collection for elemental analysis. Analysis of a sample injected into an inductively coupled plasma source may be improved by one or more of a stabilizing solution that may be mixed with the sample prior to injection and a heated injector. The stabilized solution can minimize osmotic pressure differences between the solution and the cells with relatively low amounts of dissolved solids (e.g., at or below about 0.2%). The stabilized solution may contain a salt (e.g., ammonium nitrate) present at a concentration of at least 5 mM. The injector may be heated before and / or during the injection. In some cases, heat from adjacent portions may be directed into the injector to improve heating of the injector. The injector heated to a sufficient temperature may minimize solute build-up and may extend the time available between cleaning. These improvements may be particularly useful in elemental analysis such as inductively coupled plasma mass spectrometry or inductively coupled plasma light emission spectroscopy.

The invention discloses a high-precision detection method for the content of zinc in complex matrix zinc powder, and belongs to the technical field of analytical chemistry. The method comprises five steps of sample weighing and blank test, sample dissolution and interference element volatilization, precipitation separation, titration determination and result calculation. Volatile impurities such as arsenic, antimony and tin are removed through perchloric acid volatilization, interfering ions such as iron, aluminum and manganese are separated through ammonia water precipitation and coprecipitation, residual trace interference is eliminated in combination with a composite masking agent composed of ascorbic acid, hydroxylamine hydrochloride and thiourea, and finally in an acetic acid-sodium acetate buffer system with the pH value being 5.5, PAN serves as an indicator, and an EDTA standard solution is used for titration of the zinc content. The method has the advantages of strong anti-interference capability, sharp end point, simplicity and convenience in operation, low cost and the like, is suitable for accurate determination of zinc in medium-low-purity or high-impurity zinc powder, is well matched with an ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry) method in result, and is convenient to popularize and use in medium-sized and small enterprises.