稳定碳同位素技术能有效地应用在各类食品的掺杂和溯源检测中。由于光合作用对稳定碳同位素产生的分馏效应,可运用稳定碳同位素比值分析法(Stable Carbon Isotope Ratio Analysis,SCIRA)检测不同光合途径的食品掺杂;同时,气候和地理因...稳定碳同位素技术能有效地应用在各类食品的掺杂和溯源检测中。由于光合作用对稳定碳同位素产生的分馏效应,可运用稳定碳同位素比值分析法(Stable Carbon Isotope Ratio Analysis,SCIRA)检测不同光合途径的食品掺杂;同时,气候和地理因素也对稳定碳同位素分馏有一定影响,可单独或者联合其他因素作为溯源检测指标;各种分解反应也导致同一分子内稳定碳同位素产生了一定的分馏规律,运用特异性天然同位素分馏核磁共振(Specific Natural isotope Fractionation Of Nuclear Magnetic Resonance,SNIF-NMR)可进行检测;此外,稳定碳同位素还可在同位素稀释质谱法(IDMS,Isotope Dilution Mass Spectrometry)中作为标记去检测食品中的兽药残留。本文综述了稳定碳同位素技术在各类食品掺杂和溯源检测中的研究进展,并对其应用前景进行展望,旨在推动稳定碳同位素技术在我国的应用步伐,并完善我国现有的食品检测技术。展开更多
The Tertiary in the West Depression Region of the Qaidam Basin has the typical inland salty lacustrine deposits in China. 34 natural gas samples were collected from 13 oil fields in the West Depression Region in the b...The Tertiary in the West Depression Region of the Qaidam Basin has the typical inland salty lacustrine deposits in China. 34 natural gas samples were collected from 13 oil fields in the West Depression Region in the basin, the chemical compositions and carbon isotopes of methane, ethane, propane, and butane were measured. According to the carbon isotope characteristics of natural gases in combination with geochemical characteristics of the source rocks and crude oils, the natural gases can be divided into sapropelic associated gas, mixed organic matter-derived associated gas, coal-derived gas and mixed gas. The carbon isotope characteristics, origin and distribution of the natural gases are considered to be related with the types and distribution of organic inputs in lake environments with different salinities. The lake salinity can regionally forecast the distribution of the different genetic types of natural gas. Compared with the different genetic types of natural gas from other Chinese basins, the carbon isotopes of the heavy hydrocarbons of the natural gas from the Tertiary salt lacustrine facies in the Qaidam Basin are extremely heavier. Therefore, this should be considered when natural gases are genetically classified in the basin.展开更多
文摘稳定碳同位素技术能有效地应用在各类食品的掺杂和溯源检测中。由于光合作用对稳定碳同位素产生的分馏效应,可运用稳定碳同位素比值分析法(Stable Carbon Isotope Ratio Analysis,SCIRA)检测不同光合途径的食品掺杂;同时,气候和地理因素也对稳定碳同位素分馏有一定影响,可单独或者联合其他因素作为溯源检测指标;各种分解反应也导致同一分子内稳定碳同位素产生了一定的分馏规律,运用特异性天然同位素分馏核磁共振(Specific Natural isotope Fractionation Of Nuclear Magnetic Resonance,SNIF-NMR)可进行检测;此外,稳定碳同位素还可在同位素稀释质谱法(IDMS,Isotope Dilution Mass Spectrometry)中作为标记去检测食品中的兽药残留。本文综述了稳定碳同位素技术在各类食品掺杂和溯源检测中的研究进展,并对其应用前景进行展望,旨在推动稳定碳同位素技术在我国的应用步伐,并完善我国现有的食品检测技术。
基金This work was supported by the Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.KZCX2-111)the National Natural Science Foundation of China(Grant Nos.49972051 and 40172053).
文摘The Tertiary in the West Depression Region of the Qaidam Basin has the typical inland salty lacustrine deposits in China. 34 natural gas samples were collected from 13 oil fields in the West Depression Region in the basin, the chemical compositions and carbon isotopes of methane, ethane, propane, and butane were measured. According to the carbon isotope characteristics of natural gases in combination with geochemical characteristics of the source rocks and crude oils, the natural gases can be divided into sapropelic associated gas, mixed organic matter-derived associated gas, coal-derived gas and mixed gas. The carbon isotope characteristics, origin and distribution of the natural gases are considered to be related with the types and distribution of organic inputs in lake environments with different salinities. The lake salinity can regionally forecast the distribution of the different genetic types of natural gas. Compared with the different genetic types of natural gas from other Chinese basins, the carbon isotopes of the heavy hydrocarbons of the natural gas from the Tertiary salt lacustrine facies in the Qaidam Basin are extremely heavier. Therefore, this should be considered when natural gases are genetically classified in the basin.
