43 results about "Carbon isotope composition" patented technology

Method and apparatus for providing real-time data indicative of the isotopic composition of formation fluids during drilling. The method includes the steps of: (a) providing a reference fluid having a known isotopic composition in a reference cell; (b) capturing a sample of formation; (c) providing at least one laser beam; (e) passing a beam through the reference fluid, measuring the reference-measurement beam before and after it passes through the reference fluid; (f) and passing a beam through the sample, measuring the beam before and after it passes through the sample, and calculating a first isotope concentration from those measurements. The measurements can provide information relating to the carbon isotopic composition of individual compounds in hydrocarbon gas mixtures, with the individual compounds including methane, ethane, propane, iso- or normal butane, or iso- or normal pentane.

The invention discloses a method for measuring the bicarbonate ion utilizing capability of a plant. The method comprises the following steps of: (1) respectively measuring stable carbon isotope compositions, i.e. delta 13C values of leaves of a plant to be studied and a reference plant; (2) measuring the stable carbon isotope composition, i.e. delta 13C value of microalgae; (3) substituting the delta 13C value of the leaves of the plant to be studied, the delta 13C value of the leaves of the reference plant and the delta 13C value of the microalgae into a two-end-member model and calculating the proportional share of bicarbonate ions utilized by the plant to be studied in an inorganic carbon source; (4) measuring the net photosynthetic rate of the leaves of the plant to be studied; and (5) deriving the bicarbonate ion utilizing capability of the plant to be studied according to the net photosynthetic rate of the leaves of the plant to be studied and the proportional share of the bicarbonate ions utilized by the plant to be studied in the inorganic carbon source. The invention can be used for quantitatively measuring the bicarbonate ion utilizing capability of the plant with less plant materials and less steps and simple calculation.

The invention relates to a method for analyzing a source of secondary organic carbon in ambient air fine particles. The method comprises: determining concentrations and stable carbon isotope compositions of organic carbon and elemental carbon in ambient air fine particle PM2.5; calculating to obtain stable carbon isotope composition of secondary organic carbon in the ambient air fine particle PM2.5; and finally adopting a stable carbon isotope technology to analyze a source of the secondary organic carbon in the ambient air fine particle PM2.5. According to the present invention, a binary composite isotope mass balance model is adopted to calculate the carbon isotope composition of the secondary organic carbon, such that problems that the secondary organic carbon is difficultly separated from the organic carbon and determination of the carbon isotope composition of the secondary organic carbon is difficult are solved, a new method for analyzing the source of the secondary organic carbon is provided, and problems that tracers are limited and identification is difficult of the existing organic molecule tracer method are avoided.

The invention discloses a method for detecting and quantifying utilization of carbon source in calcium carbonate by microalgae. The method comprises the following steps: adding two types of calcium carbonate powder with great difference in Epsilon 13 C value but same crystal form respectively to cultivate the to-be-detected microalgae, measuring the protein content of the microalage at different incubation time and Epsilon 13 C value of the stable carbon isotope composition of the microalage after a harvest; then, remedying the measured Epsilon 13 C value of the microalage at the time of the harvest by using the protein content of the initial microalage and Epsilon 13 C value, and obtaining the share of carbon source in the added calcium carbonate utilized by the microalgae by using the isotope mixed model; through the data about the protein content of the microalage at different incubation time and Redfield value, fitting an exponential growth equation about the biomass and time; finally, calculating the amount of carbon source in calcium carbonate obtained by the detected microalgae of biomass per unit in unit time according to the share of carbon source in the added calcium carbonate utilized by the microalgae and the equation about the biomass and time.

The invention discloses a determination method for the fractional value of stable carbon isotopes in the carbon dioxide assimilation process of microalgae. The determination method comprises the following steps: respectively adding two types of sodium bicarbonate with large delta<13>C value difference into a detection culture solution added with 10mM acetazolamide to culture the microalgae to be detected; obtaining a composition of the stable carbon isotopes of a newly born algae body of detected microalgae cultured in the detection culture solution labelled by two types of isotopes and the portion of added inorganic carbon source utilized by the microalgae to be detected; according to the result and the composition of the average stable carbon isotopes of atmospheric carbon dioxide in the culture environment during the culture period, obtaining the fractional value of the stable carbon isotopes in the carbon dioxide assimilation process of the microalgae. The determination method disclosed by the invention has the advantages that the fractional value of the stable carbon isotopes can be determined in vivo, and not only can the fractional value of the stable carbon isotopes of a single microalgae seed be detected, but also the fractional value of the stable carbon isotopes of mixed microalgaes can be detected, and the detected data are reliable and the accuracy of a result is high.

The invention discloses a method for measuring the daily mean stable carbon isotope composition of atmospheric carbon dioxide, which is characterized by comprising the steps of (I) measuring sodium bicarbonate produced by different manufacturers as tracer agents; (II) adding sodium bicarbonate into a nutrient solution respectively, and setting the concentration of sodium bicarbonate in the nutrient solution to 10mM and the pH value to 8.30; (III) cultivating the plants with same growth cycle by use of the prepared solution at the same time, and after 24 hours of cultivation, separately measuring the values of the stable carbon isotope composition (delta)13C in two isotope-labeled nutrition solutions, namely a value of (delta)1 and a value of (delta)2; (IV) substituting the measured values of (delta)C1, (delta)C2, (delta)1 and (delta)2 into an equation, and calculating the proportion fB of added sodium bicarbonate to total inorganic carbon in the solution; (V) judging whether the value of fB is less than 0.6, fetching the measured values obtained by an experiment when the value of fB is less than 0.60, substituting the measured values into an equation, and calculating the average value of inorganic carbon (delta)13C entering the culture solution in atmospheric carbon dioxide within the time period (delta)a; (VI) substituting the calculated (delta)a into an equation (delta)Ca=(delta)a+(Delta)CO2(air)-HCO3(aq), and calculating the daily mean stable carbon isotope composition (delta)Ca of atmospheric carbon dioxide.

A carbon nanotube array is provided. The carbon nanotube array includes at least two isotope-doped carbon nanotube sub-arrays. Each isotope-doped carbon nanotube sub-array includes a plurality of carbon nanotubes. The carbon nanotubes in different isotope-doped carbon nanotube sub-array are composed of different kinds of carbon isotopes. The present disclosure also provides a method for making the carbon nanotube arrays.

The invention belongs to the technical field of determination of carbon dioxide and carbon isotope composition in mineral inclusion, and particularly relates to a determination device and a determination method for carbon dioxide and carbon isotope composition in mineral inclusion. The device comprises a first helium inlet, a first valve, a first water trap, a second helium inlet, a second valve, a second water trap, a third water trap, a temperature control heating furnace, a six-way valve, a carbon dioxide trap, a single-opening quartz tube, a carbon dioxide collecting tube, a liquid nitrogen cup, a stable isotope mass spectrometer, a sample injection needle, a sample tube and a plurality of connecting pipelines. A continuous flow sampling device is adopted, a mineral inclusion bursting device and the carbon dioxide collecting device are connected with the stable isotope mass spectrometer, and online heating bursting of the mineral inclusion, online collecting of carbon dioxide gas and online testing of carbon dioxide carbon isotope are achieved.

The invention belongs to the technical field of determination of carbon isotope composition of methane in gas, and particularly discloses an online continuous flow extraction device for methane in gasand a carbon isotope composition analysis method. The device comprises a first six-way valve, a plurality of helium inlets communicated with the first six-way valve, a second six-way valve communicated with the first six-way valve, a helium inlet communicated with the second six-way valve, a carbon dioxide collecting pipe communicated with the second six-way valve, a single-opening quartz tube communicated with the second six-way valve, and a stable isotope mass spectrometer communicated with the second six-way valve. The method comprises the following steps of: 1, loading a gas sample; 2, conducting blow-back degassing, and completely exhausting air in pipelines at the two ends of a gas collecting pipe; 3, oxidizing, purifying and collecting methane in the gas; 4, sublimating and injecting carbon dioxide; and 5, determining methane carbon isotopes. According to the invention, the problems of excessive use amount of off-line pretreatment sample preparation gas, complicated operation process and low efficiency are solved.

The invention discloses a method for acquiring bicarbonate using share of plants in field habitat, and belongs to the field of crop information detection technologies and ecological environmental management. The method includes acquiring extracellular atmospheric carbon dioxide concentration and intercellular carbon dioxide concentration data by the aid of portable photosynthetic apparatuses, measuring air carbon dioxide and soil bicarbonate using stable carbon isotope fractionation values of the plants at different seedling ages and different growth periods in different environments, and combining atmospheric carbon dioxide stable carbon isotope composition and rhizosphere soil bicarbonate stable carbon isotope composition of the plants with each other; acquiring instant information of the bicarbonate using share of the plants at the different seedling ages and the different growth periods in the different environments according to double-end-member isotope hybrid models. The method has the advantages that atmospheric carbon dioxide using share of the plants at the different seedling ages and the different growth periods in the field habitat can be quickly, conveniently and accurately acquired in real time by the aid of the method, and the bicarbonate using share of the plants in the field habitat also can be acquired by the aid of the method.

The invention relates to a method for detecting exogenously added ethyl caproate in liquor based on stable isotope technology and principles, and belongs to the technical field of authenticity identification of liquor. The main steps are as follows: (1) measure the carbon isotope composition of the target compound (ethyl hexanoate) in a real liquor sample of a certain flavor, measure the carbon isotope composition of the carbon isotope endogenous marker of the target compound, and determine the target compound and The average difference and standard deviation (σ) of the δ13C values ​​between the internal standards; (2) measure the δ13C values ​​of the target compound and its endogenous markers in the liquor samples to be tested, and calculate the difference between the two Δ13C samples to be tested; ( 3) Determine whether the sample to be tested contains ethyl hexanoate added from an external source. The invention utilizes the stable isotope technology to establish a method capable of accurately detecting whether the liquor contains ethyl hexanoate added from an external source.

The invention provides a reservoir fluid property identification method, comprising: analyzing a sandstone sample of a target reservoir section to be identified in a single well, obtaining first carbon isotope data constituting the sandstone sample, and processing the first carbon isotope data , to obtain the second carbon isotope data that meets the carbon content standard; according to the second carbon isotope data, a reservoir fluid property identification chart is established, and then according to the reservoir fluid property identification chart, the tight sandstone target reservoir section to be identified in a single well is The properties of the fluid are identified. The technical scheme of the invention significantly improves the accuracy rate of fluid property identification of the target reservoir section to be identified, deepens the understanding of gas reservoirs, and has high application value.

The invention discloses a method and a system for high-resolution determination of organic carbon isotopes in stalagmite. The method comprises the following steps: loading a stalagmite powder sample into an inverted Y-shaped sample bottle; at the bottom of a first branch, adding 1 mol / L of hydrochloric acid into the stalagmite powder sample; after chromic acid is added to the bottom of a second branch, screwing a bottle pad and a bottle cap which are used for sealing to the first branch; connecting the first branch with a vacuum pipeline of a vacuum system; separating the vacuum system from the first branch, and then inserting a double-hole needle into the bottle cap and the bottle pad; filling the sample bottle with helium through the double-hole needle; fully mixing chromic acid in the second branch with the acidified stalagmite powder sample in the first branch; and inserting the double-hole needle into the bottle cap and the bottle pad. Organic CO2 flowing through a silver wire purification tube is enriched and purified, and then is introduced into a mass spectrometer to determine the carbon isotope composition, so that high-resolution determination of the organic carbon isotope in the stalagmite powder sample is realized.

A carbon nanotube array is provided. The carbon nanotube array includes at least two isotope-doped carbon nanotube sub-arrays. Each isotope-doped carbon nanotube sub-array includes a plurality of carbon nanotubes. The carbon nanotubes in different isotope-doped carbon nanotube sub-array are composed of different kinds of carbon isotopes. The present disclosure also provides a method for making the carbon nanotube arrays.

The invention belongs to the technical field of analysis methods for natural gas and especially relates to a carbon isotope analysis method for a series of hydrocarbon compounds in natural gas. The method comprises the following steps: step A, carrying out solid-phase micro-extraction enrichment on a series of hydrocarbon compounds in natural gas; step B, separating the hydrocarbon compounds and carrying out qualitative analysis on unknown hydrocarbon compounds; and step C, carrying out carbon isotope determination on the hydrocarbon compounds. According to the invention, solid-phase micro-extraction technology is introduced into a natural gas isotope analysis method and combined with a GC-IRMS analysis system, influence of factors like equilibrium time and equilibrium temperature on difference of adsorption capability of the hydrocarbon compounds and on carbon isotope values are analyzed, and operation conditions are optimized, so effective enrichment and carbon isotope composition analysis of the series of hydrocarbon compounds in natural gas are realized. The method provided by the invention can realize rapid and effective enrichment and carbon isotope composition analysis of the series of hydrocarbon compounds in natural gas.

The invention relates to a method for detecting exogenously added ethyl caproate and ethyl lactate in liquor on the basis of a stable isotope technique and principle and belongs to the technical field of authenticity identification of liquor. The method mainly comprises steps as follows: (1), the carbon isotope composition of a target chemical compound (ethyl caproate and / or ethyl lactate) in a fragrance type real liquor sample is detected, and the carbon isotope composition of a carbon isotope endogenous marker of the target chemical compound is detected, and the average difference of delta13C values between the target chemical compound and an internal standard substance as well as the standard deviation sigma is determined; (2), delta13C values of the target chemical compound and the internal standard substance of the target chemical compound in the to-be-detected liquor sample are detected, and the difference value delta13C (to-be-detected sample) of the target chemical compound and the internal standard substance is calculated; (3), whether the to-be-detected sample contains the exogenously added ethyl caproate and / or ethyl lactate is judged. The method used for effectively detecting whether the liquor contains exogenously added ethyl caproate and / or ethyl lactate is established with a stable isotope technique.

The invention relates to a method for detecting exogenous addition of ethyl lactate in liquor based on stable isotope technology and principle, and belongs to the technical field of authenticity identification of liquor. The main steps are as follows: (1) Determination of the carbon isotope composition of the target compound (ethyl lactate) in a real liquor sample of a certain flavor, determining the carbon isotope composition of the carbon isotope endogenous marker of the target compound, and determining the target compound and the endogenous marker. The average difference and standard deviation (σ) of the δ13C value between the standard substances; (2) Measure the δ13C value of the target compound and its endogenous marker in the liquor sample to be tested, and calculate the difference Δ13C of the sample to be tested; (3) ) to determine whether the sample to be tested contains exogenously added ethyl lactate. The present invention establishes a method capable of accurately detecting whether the liquor contains exogenously added ethyl lactate by using the stable isotope technology.