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 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.

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.