Determination of refractory organic matter in marine sediments by chemical oxidation, analytical pyrolysis and solid-state 13C nuclear magnetic resonance spectroscopy
Determination of refractory organic matter in marine sediments by chemical oxidation, analytical pyrolysis and solid-state 13C nuclear magnetic resonance spectroscopy
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DOI：
10.1111/j.1365-2389.2007.00979.x
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发表时间：
2008-06-01
影响因子：
4.2
通讯作者：
Gonzalez-Vila, F. J.
中科院分区：
文献类型：
--
作者：
De La Rosa, J. M.;Gonzalez-Perez, J. A.;Gonzalez-Vila, F. J.
寻求量化的难降解有机物（ROM），其中包括黑色碳类物质（BC），在海洋沉积物中的量，我们已经应用了两个步骤的程序，包括化学氧化与钠的脱矿质沉积物，然后通过整合的芳香族C区域的剩余残留物的固态C-13核磁共振（NMR）光谱。在四甲基氢氧化铵（TMAH）存在下通过分析热解测试木质素去除的功效。河流，河口和近海海洋沉积物样品采集自西班牙西南大西洋海岸，地质和环境利益的网站。BC类物质的测定含量在总有机碳的3.0和45.7%之间。较大的相对BC含量被发现在河流沉积物靠近城市地区，这表明人为有机物质的输入升高。近海沉积物中类硼化合物的含量（5.5-6.1%）与前人报道的这类样品的含量相近。然而，NMR和热解-GC/MS的分离ROM显示，丰富的难熔脂肪族有机物质仍然在大多数海洋样品后，反硝化氧化。我们认为，这个脂肪族碳库可能在全球碳循环中发挥重要作用，作为一个稳定的碳库。
Seeking to quantify the amount of refractory organic matter (ROM), which includes black carbon-like material (BC), in marine sediments, we have applied a two-step procedure that consists of a chemical oxidation with sodium chlorite of the demineralized sediments followed by integration of the aromatic C region in the remaining residues by solid-state C-13 nuclear magnetic resonance (NMR) spectroscopy. The efficacy for lignin removal was tested by analytical pyrolysis in the presence of tetramethyl ammonium hydroxide (TMAH). Riverine, estuarine and offshore marine sediment samples were collected from the southwest Atlantic coast of Spain, a site of geological and environmental interest. Measured contents of BC-like material ranged between 3.0 and 45.7% of the total organic carbon. Greater relative BC contents were found in riverine sediments close to urban areas, which show an elevated input of anthropogenic organic material. The contents of BC-like material in offshore marine sediments (5.5-6.1%) were similar to those previously reported for these kinds of samples. However, NMR and pyrolysis-GC/MS of the isolated ROM reveals that abundant refractory aliphatic organic material remains in most of the marine samples after chlorite oxidation. We suggest that this pool of aliphatic carbon may play an important role as a stable carbon pool within the global C cycle.