146 results about "Isotopic ratio" patented technology

A method and apparatus are provided that assess reservoir compartmentalization by determining whether there are compositional differences such as whether the isotopic ratios of carbon (13C/12C) or of oxygen (17O/18O) are the same or different in various parts of the reservoir. A quartz enhanced photoacoustic spectrometer is provided for analysis of reservoir samples taken in various parts of the reservoir for comparison of geochemical composition to estimate reservoir compartmentalization.

A neutron detector composed of a matrix of scintillating particles imbedded in a lithiated glass is disclosed. The neutron detector detects the neutrons by absorbing the neutron in the lithium-6 isotope which has been enriched from the natural isotopic ratio to a commercial ninety five percent. The utility of the detector is optimized by suitably selecting scintillating particle sizes in the range of the alpha and the triton. Nominal particle sizes are in the range of five to twenty five microns depending upon the specific scintillating particle selected.

The present invention provides a method and apparatus for detecting, by absorption spectroscopy, an isotopic ratio of a sample, by passing first and second laser beams of different frequencies through the sample. Two IR absorption cells are used, a first containing a reference gas of known isotopic ratio and the second containing a sample of unknown isotopic ratio. An interlacer or reflective chopper may be used so that as the laser frequencies are scanned the absorption of the sample cell and the reference cell are detected alternately. This ensures that the apparatus is continuously calibrated and rejects the baseline noise when phase sensitive detection is used.

A method and apparatus are provided that assess reservoir compartmentalization by determining whether there are compositional differences such as whether the isotopic ratios of carbon (13C/12C) or of oxygen (17O/18O) are the same or different in various parts of the reservoir. A quartz enhanced photoacoustic spectrometer is provided for analysis of reservoir samples taken in various parts of the reservoir for comparison of geochemical composition to estimate reservoir compartmentalization.

Embodiments of the present invention provide for a system for accelerating hydrogen ions. A hydrogen generator holding a supply of water is configured to generate a flow of hydrogen gas from the supply of water. An ion source structure is configured to generate a plurality of hydrogen ions from the flow of hydrogen gas. An accelerator tube is configured to accelerate the plurality of hydrogen ions. The supply of water has an isotopic ratio of deuterium that is smaller than the isotopic ratio of deuterium in Vienna Standard Mean Ocean Water.

An isotope ratio mass spectrometer is described that obtains direct ratios of atomic isotopes in a monoenergetic beam of negative ions by passing them through a collision cell at specific kinetic energies for which the relative production of positive ions from the negative ions is calculable from the isotopic masses.

An apparatus and method (and related kit) for determination of the isotopic ratio of ¹³C to ¹²C in a gas sample containing carbon dioxide comprising introducing gas into a gas sample chamber, directing light into the sample chamber from a laser light source, the laser light source being capable of accessing one or more of the wavelength pairs 2054.37 and 2052.42; 2054.96 and 2051.67; or 2760.53 and 2760.08 nanometers, and with a detector detecting the laser light energy after passage through the sample chamber.

There is described a method for measuring a concentration of a gas component in a measuring gas, wherein the light of a wavelength tunable light source is passed along a single optical path through a measuring volume containing the measuring gas and a reference cell containing a reference gas to a detector. The reference cell is selected to contain a selected isotope of the gas component to be measured in a known abundance ratio higher than the known natural-abundance isotope ratio of the gas component in the measuring volume; the light source is tuned to sweep the wavelength of the light over the absorption lines of the selected isotope and the remaining gas component; and the concentration of the gas component in the measuring volume is calculated from the ratio of the detector signals at the peaks of the absorption lines, based on Lambert's law and taking into account the known abundance isotope ratios.

Method and apparatus for detecting, by absorption spectroscopy, an isotopic ratio of a sample, by passing first and second laser beams of different frequencies through the sample. Two IR absorption cells are used, a first containing a reference gas of known isotopic ratio and the second containing a sample of unknown isotopic ratio. An interlacer or reflective chopper may be used so that as the laser frequencies are scanned the absorption of the sample cell and the reference cell are detected alternately. This ensures that the apparatus is continuously calibrated and rejects the baseline noise when phase sensitive detection is used.

The invention discloses a method for measuring the uranium isotope ratio of a single particle by SEM-ICP-MS. The method comprises the following steps: (1) preparation of a uranium particle sample; (2) search, identification and transfer of the uranium particle; (3) Dissolution of uranium particles; (4) determination of uranium isotope ratio, described step (3) is to put the silicon chip with uranium particles into the reagent bottle, add HNO3, heat on the electric heating plate to dissolve the particles, and then add Deionized water is used to adjust the acidity; in the step (4), a multi-receiver inductively coupled plasma mass spectrometer (MC-ICP-MS) is used to simultaneously receive 235U and 238U signals for sample measurement. The invention provides a SEM-ICP-MS method for determining the uranium isotope ratio of a single particle with fast particle dissolution rate, large sample processing capacity, small amount of sample required for measurement, relatively high measurement precision and short measurement time.

Method and apparatus for detecting, by absorption spectroscopy, an isotopic ratio of a sample, by passing first and second laser beams of different frequencies through the sample. Two IR absorption cells are used, a first containing a reference gas of known isotopic ratio and the second containing a sample of unknown isotopic ratio. An interlacer or reflective chopper may be used so that as the laser frequencies are scanned the absorption of the sample cell and the reference cell are detected alternately. This ensures that the apparatus is continuously calibrated and rejects the baseline noise when phase sensitive detection is used.

The invention relates to an isotope based surface water pollution source analytical method, which comprises the steps of: 1) sampling: laying sampling points and conducting sampling according to industry standards; 2) isotope detection: taking isotopes of hydrogen, oxygen, carbon and nitrogen, namely D, <18>O, <13>C, and <15>N as the indexes; employing an isotope ratio mass spectrometer to detect the ratios of isotopes of hydrogen, oxygen, carbon and nitrogen, namely D, <18>O, <13>C, and <15>N in samples, and conducting comparison with international standard substances, and working out isotope ratios of the samples; and 3) data analysis: drawing a hydrogen and oxygen isotope ratio diagram according to the ratios of isotopes of hydrogen and oxygen, namely D and <18>O in source and convergence samples; selecting analysis nodes, calculating a pollution source contribution rate through a source convergence isotope ratio of the nodes, and determining a new pollution source by judging whether the source convergence isotope ratio of outflow nodes is balanced, and then making use of analysis of the isotopes of carbon and nitrogen, namely <13>C and <15>N to verify the accuracy of the result. The method provided by the invention has the advantages of improving the accuracy and efficiency.

The present innovation is related with chemical instrumental analysis, i.e. to the domain of analysis of stable isotopes in food products, and it is related to the method for preparation of ethanol samples and mode for determination of isotopic ratio of non-exchangeable hydrogen stable isotopes sited on the methyl site of ethanol by means of instrumental technique CF-TC/EA-IRMS (Continuous Flow-Temperature Conversion/Elemental Analyzer-Isotope Ratio Mass Spectrometry), and for the purpose of establishing authenticity and geographical origin of wine and grape must, beer, alcoholic beverages, fruit juices, honey, vinegars and other food products which contain alcohol and/or fermentable sugars. This method is based on full enzymatic (or organic) transformation of ethanol samples to gain ethanoic acid (acetic acid), controlled neutralization of acetic acid and further concentration, purification of prepared acetate salt and its drying to the constant mass and further determination of δD values in prepared samples by means of CF-TC/EA-IRMS.

A process and an apparatus for isotope ratio analysis, the process having the following steps: performing a liquid chromatography process and thus providing an eluate which comprises at least one liquid carrier fluid and at least one analytes, collecting a portion of interest from the eluate, processing the eluate portion to form at least one gaseous conversion products of the analytes, and supplying the gaseous conversion products, especially with gaseous carrier fluid, to an isotope analyzer and determining the isotrope ratios.

The invention relates to an online analysis method for hydrocarbon carbon isotope of a light dydrocarbon monomer of source rock pyrolysis products. The method comprises the following steps: placing source rock sample particles into a sample pipe; connecting the sample pipe with a sample inlet of a gas chromatograph; adjusting the pressure of carrier gas of a pyrolyzer to 15 to 18psi; introducing the carrier gas to a pyrolyzing furnace for 5 to 10 minutes, and fully filling a liquid nitrogen cold trap with liquid nitrogen; heating the pyrolyzing furnace to be at a preset temperature, keeping the temperature for 30 minutes to obtain a hydrocarbon compound; lowering the temperature of the pyrolyzing furnace to 80 to 85 DEG C, removing the liquid nitrogen cold trap, and starting the gas chromatograph and an isotope ratio mass spectrometry; separating the hydrocarbon compound to single-molecule hydrocarbon compounds by the gas chromatograph; burning the single-molecule hydrocarbon compounds to obtain CO2; measuring the carbon isotope ratio of the CO2 by the isotope ratio mass spectrometry; and recording the carbon isotope ratio and generating a mass spectrum. The method provided by the invention has the characteristics of being high in reliability, convenient to operate, quick in analysis, and low in analysis cost.

Biological fluid samples containing proteins (e.g., blood plasma or saliva) are prepared for isotopic analysis by precipitating the proteins while leaving the isotopic ratio unaffected. This precipitation can involve adding metal ions, salts, organic solvents, or organic polymers. The sample is then centrifuged to allow transfer of the supernatant for isotopic analysis, e.g. by tunable diode laser absorption spectrometry to obtain a quantitative measure of the ²H and ¹⁸O isotope levels in the water relative to reference standards.

The invention relates to the field of element isotope analysis, and particularly discloses an element isotope analysis system, an analysis method of sulfur isotopes in a trace sulfate sample and application of the analysis method. The system comprises an element analyzer, an enrichment device, a gas chromatographic column, an isotope ratio mass spectrometer and a heating device which are connectedin sequence, and pipelines for connecting or communicating equipment, wherein the pipeline used for connecting or communicating the equipment is a Teflon pipe, the gas chromatographic column is a chromatographic column made of a Teflon material, the enrichment device comprises a multi-way valve, a sample tube and a cooling trap, at least one part of the sample tube can be arranged in the coolingtrap to realize enrichment, and the heating device is arranged around the sample inlet, the sample inlet valve and the ion source of the isotope ratio mass spectrometer. The analysis method is simple,controllable, easy to operate, capable of utilizing the sample to the maximum extent, low in instrument detection limit, high in sensitivity, small in analysis error and high in accuracy.

The invention belongs to the technical field of monitoring of nuclear technology, and discloses a method for measuring the isotope ratio of uranium in a single particle. The method comprises the following steps: firstly seeking a uranium-containing particle by using a scanning electron microscope, using a micro-operation system to transfer the uranium-containing particle to a conductive adhesive with a marked metal mesh on the surface, positioning and fixing the uranium-containing particle, and then analyzing the isotope ratio by using a laser ablation-inductively coupled plasma mass spectrometry. The method has the advantages of simple and quick pre-treatment method, simplified analysis flow, and high analysis precision which can reach to 1%.

A process and to an apparatus for isotope ratio analysis having the steps of: performing an LC process and thus providing a first eluate which comprises at least one first liquid carrier fluid and one or more analytes, collecting a portion of interest from the eluate, processing the eluate portion of interest by combining with a second liquid carrier fluid and removing the first carrier fluid to form a processed eluate portion, processing the processed eluate portion to form one or more gaseous conversion products of the analytes, and supplying the gaseous conversion products with gaseous carrier fluid to an isotope analyzer and determining the isotope ratios.