Samples from a pristine raised peat bog runoff in Austria, the Tannermoor creek, were analysed for their iron linked to natural organic matter (NOM) content. Dissolved organic carbon < 0.45 μm (DOC) was 41–64 mg L−1, iron 4.4–5.5 mg L−1. Samples were analysed applying asymmetric field flow fractionation (AsFlFFF) coupled to UV–vis absorption, fluorescence and inductively coupled plasma mass spectrometry (ICP-MS). The samples showed an iron peak associated with the NOM peak, one sample exhibiting a second peak of iron independent from the NOM peak. As highland peat bogs with similar climatic conditions and vegetation to the Tanner Moor are found throughout the world, including areas adjacent to the sea, we examined the behaviour of NOM and iron in samples brought to euhaline (35‰) conditions with artificial sea salt. The enhanced ionic strength reduced NOM by 53% and iron by 82%. Size exclusion chromatography (SEC) of the samples at sea-like salinity revealed two major fractions of NOM associated with different iron concentrations. The larger one, eluting sharply after the upper exclusion limits of 4000–5000 g mol−1, seems to be most important for iron chelating. The results outline the global importance of sub-mountainous and mountainous raised peat bogs as a source of iron chelators to the marine environment at sites where such peat bogs release their run-offs into the sea.

中文翻译：

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来自奥地利坦纳摩尔的天然有机物和铁出口

对来自奥地利坦纳穆尔溪原始泥炭沼泽径流的样品进行了分析，以确定与天然有机物 (NOM) 含量相关的铁。溶解的有机碳 < 0.45 μm (DOC) 为 41–64 mg L-1，铁为 4.4–5.5 mg L-1。应用不对称场流分馏 (AsFlFFF) 与 UV-vis 吸收、荧光和电感耦合等离子体质谱 (ICP-MS) 耦合分析样品。样品显示出与 NOM 峰相关的铁峰，一个样品表现出独立于 NOM 峰的第二个铁峰。由于在世界各地都发现了气候条件和植被与坦纳沼泽相似的高原泥炭沼泽，包括毗邻大海的地区，我们检查了用人工海盐带到 euhaline (35‰) 条件的样品中 NOM 和铁的行为。增强的离子强度使 NOM 减少了 53%，铁减少了 82%。在类似海洋的盐度下对样品进行尺寸排阻色谱 (SEC) 显示，NOM 的两个主要部分与不同的铁浓度相关。较大的在 4000-5000 g mol-1 的排除上限后急剧洗脱，似乎对铁螯合最重要。结果概述了山下和山区凸起的泥炭沼作为海洋环境中铁螯合剂来源的全球重要性，这些泥炭沼将其径流释放到海中。似乎对铁螯合最重要。结果概述了山下和山区凸起的泥炭沼作为海洋环境中铁螯合剂来源的全球重要性，这些泥炭沼将其径流释放到海中。似乎对铁螯合最重要。结果概述了山下和山区凸起的泥炭沼作为海洋环境中铁螯合剂来源的全球重要性，这些泥炭沼将其径流释放到海中。