生物标志化合物对于煤炭产地溯源的指示

Indication of biomarkers for coal origin traceability

为了保障进口煤炭质量和安全,急需建立起一套行之有效的产地溯源方法对进口煤炭进行产地溯源和掺假识别。利用气相色谱-质谱联用仪(GC-MS)对来自5个进口国家的煤炭样品进行了分析,并对有机质中代表性生物标志化合物进行了定性和定量分析,以期对煤炭产地溯源新方法新技术提供启示。结果表明:根据样品饱和烃Ph/nC_(18)和Pr/nC_(17)关系结果认为这5个国家的煤炭样品基本都处于低成熟-成熟阶段,澳大利亚、俄罗斯、马来西亚和菲律宾的煤炭主要为陆源氧化环境下的Ⅲ型有机质;除来自印度尼西亚的c56号样品外,印尼其他煤炭样品和菲律宾全部煤炭样品的正构烷烃分布以中高相对分子质量为主,暗示母质来源可能为陆源高等植物。研究结果证明不同的样品来自于不同的沉积环境,有着不同的有机质输入类型等,采用特定的指标可在一定程度上对溯源可起到指示作用。

As the second-largest economy in the world,China has extremely rich coal resources,but the coal resources available for direct mining and utilization are relatively limited and need to rely heavily on imports.To ensure the quality and safety of imported coal,it is urgent to establish a set of effective origin traceability methods to trace the origin and identify the adulteration of imported coal.In this study,coal samples from five importing countries were analysed by gas chromatography-mass spectrometry(GC-MS),and representative biological fingerprint compounds in the organic matter were analysed qualitatively and quantitatively to provide enlightenment for new methods and technologies of coal origin traceability.According to the relationship between Ph/nC_(18) and Pr/nC_(17),the coal samples of these five countries are considered to be in the low maturity stage.The coal of Australia,Russia,Malaysia and the Philippines is mainly typeⅢorganic matter in a terrestrial oxidation environment.Except for the C_(56) sample from Indonesia,the distribution of n-alkanes in other coal samples from Indonesia and all coal samples from the Philippines mainly have medium and high molecular weight,suggesting that the source of parent material may be terrestrial higher plants.Different samples from different sedimentary environments have different types of organic matter input,and the application of specific indicators of organic matters is an effective method for geographical origin traceability of imported coal to a certain extent.