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Identification, fluxes and stable isotope composition of halocarbons released from halogen rich semi-arid environments

富卤半干旱环境释放卤代烃的鉴定、通量和稳定同位素组成

基本信息

批准号：
193269096
负责人：
Professor Dr. Frank Keppler
金额：
--
依托单位：
Max-Planck-Institut für Chemie (Otto-Hahn-Institut)
依托单位国家：
德国
项目类别：
Research Units
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/193269096?language=en
关键词：
Identification fluxes stable isotope composition

项目摘要

Although it has recently been established that terrestrial ecosystems play an important role in production, consumption and emission of volatile halogenated compounds, they are still very poorly characterized. The objective of these proposed research activities as part of the DFG research unit HALOPROC is to further explore the formation of environmentally-relevant halocarbons such as the halomethanes, chloromethane, bromomethane, iodomethane, chloroform and bromoform; and look for previously uncharacterized emissions of short-lived larger halocarbons from halogen rich soils and associated vegetation. A recently developed fast GC-MS system will be employed to assess these emissions in the laboratory using samples collected in semi-arid salt rich environments (including samples from the first and second phase of the project). In addition stable isotope values of abundant volatile halogenated compounds will be measured from these soil and plant samples. The stable carbon and hydrogen isotope composition (δ13C and δ2H values) of halocarbons will be used to investigate their biogeochemical cycles and global source-sink relationships, as well as the underlying mechanisms. Laboratory based investigations of several environmental parameters influencing the emissions of halocarbons will be conducted. Furthermore, a series of laboratory experiments with varying degrees of complexity will be conducted to gain more information about the underlying mechanisms involved in halocarbon formation in saline soils and halophytes. Instrumentation used in these investigation will also be linked into other activities such as the photochemical/aerosol chamber.

虽然最近已确定陆地生态系统在挥发性卤代化合物的生产、消费和排放方面发挥着重要作用，但对这些生态系统的特征描述仍然很少。这些拟议的研究活动是DFG研究单位HALOPROC的一部分，其目的是进一步探索与环境有关的卤代烃的形成，如卤代甲烷、氯甲烷、溴甲烷、碘甲烷、氯仿和溴仿;并寻找以前未定性的来自卤素丰富的土壤和相关植被的寿命短的较大的卤代烃排放。将采用最近开发的快速GC-MS系统，利用在半干旱富盐环境中收集的样本（包括项目第一和第二阶段的样本），在实验室评估这些排放。此外，将从这些土壤和植物样本中测量大量挥发性卤化化合物的稳定同位素值。利用卤代烃的稳定碳、氢同位素组成（δ 13 C和δ 2 H值）研究其地球化学循环和全球源-汇关系，并探讨其形成机制。将对影响卤化碳排放的若干环境参数进行实验室调查。此外，还将进行一系列复杂程度不同的实验室实验，以获得更多关于盐渍土和盐生植物中卤化碳形成的基本机制的信息。这些调查中使用的仪器也将与其他活动联系起来，如光化学/气溶胶室。