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首页> 外文期刊>Marine Chemistry >Different pools of black carbon in sediments from the Gulf of Cadiz (SW Spain): Method comparison and spatial distribution
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Different pools of black carbon in sediments from the Gulf of Cadiz (SW Spain): Method comparison and spatial distribution

机译：加的斯湾（西班牙西南）沉积物中不同的黑碳库：方法比较和空间分布

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摘要

Black carbon (BC) accounts for a quantitatively important fraction of the carbon sink in marine sediments. Yet, the determination of its role in the environment remains controversial largely due to the large variability of BC estimates yielded by the diversity of analytical techniques presently used. In this study, we combine the application of a thermal oxidation technique (graphitic BC, or GBC) with a molecular method (benzene polycarboxylic acids, or BPCA) for determining the presence of different types of BC in 15 marine sediments from the Gulf of Cadiz (GoC). Accounting for the two condensation end-members of the BC set (chars and graphitic carbon) constitutes the first approach to a comprehensive estimate of the BC burial in the GoC Continental Shelf. Measurements of BC in the GoC sediments ranged from 0.01 to 0.23% dw, with different ranges obtained with each technique (0.01-0.11 for GBC versus 0.01-0.23 for BPCA). BC resulting from the use of the thermal GBC method (measuring soot and graphitic carbon) or the BPCA as molecular markers (detecting mostly char) showed different spatial distributions in the GoC and varied from 13 · 10~3 to 26 · 10~3 t of BC/yr depending on the method used. Mostly petrogenic in origin GBC was less abundant and more homogeneously distributed along the Guadiana River plume, whereas largely pyrogenic BPCA-BC was generally more abundant but specifically enriched in the mid-region of the plume. The Guadiana River plume combined with hydrodynamic sorting is argued to be the main distribution factors for graphitic carbon and charcoals, whereas airborne soot seems to compose an undetermined and potentially overlapping fraction of both analytical measurements (GBC and BPCA). The structural analysis of the thermal residues and the molecular markers provided valuable information on the BC nature in the environmental matrices. The results of this study illustrate the importance of considering different analytical windows of the BC catchall for constraining regional burial sinks of heterogeneous BC sources.
机译：在海洋沉积物中，黑碳（BC）占碳汇数量的重要组成部分。然而，由于目前使用的分析技术的多样性，BC估计值的巨大差异，确定其在环境中的作用仍然存在争议。在这项研究中，我们将热氧化技术（石墨BC或GBC）的应用与分子方法（苯多元羧酸或BPCA）相结合，以确定来自加的斯湾的15种海洋沉积物中不同类型BC的存在。 （GoC）。考虑到BC集的两个冷凝末端成员（炭和石墨碳）是对GoC大陆架中BC埋葬进行综合评估的第一种方法。 GoC沉积物中BC的测量范围为0.01至0.23％dw，每种技术的测量范围都不同（GBC为0.01-0.11，而BPCA为0.01-0.23）。使用热GBC方法（测量烟灰和石墨碳）或BPCA作为分子标记（主要检测炭）产生的BC在GoC中显示出不同的空间分布，范围从13·10〜3到26·10〜3 t BC / yr取决于所使用的方法。沿瓜迪亚纳河羽流起因的主要是成岩作用的GBC较少，分布较均匀，而热成因的BPCA-BC大多较丰富，但在羽流的中部区域特别富集。瓜迪亚纳河的羽状流与流体力学分选相结合被认为是石墨碳和木炭的主要分布因素，而空气中的烟灰似乎构成了两种分析方法（GBC和BPCA）中不确定且可能重叠的部分。对热残留物和分子标记的结构分析提供了有关环境基质中BC性质的有价值的信息。这项研究的结果表明，考虑约束不列颠哥伦比亚省捕捞袋的不同分析窗口对于限制异类不列颠哥伦比亚省污染源的区域性埋藏的重要性。

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