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首页> 外文期刊>Marine pollution bulletin >Iron mineralogy and speciation of sediment iron-bearing minerals in mangrove forest: Case study of Zhangjiang estuary, China
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Iron mineralogy and speciation of sediment iron-bearing minerals in mangrove forest: Case study of Zhangjiang estuary, China

机译：红树林中铁矿物学和沉积物中含铁矿物的形态研究-以张江口为例

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摘要

Few investigations of iron speciation exist in intertidal conditions with little attention given to understanding the geochemical behavior of Fe3+-Fe2+ and its biogeochemical processes. Here, one sediment core was collected in Yunxiao mangrove forests, Zhangjiang estuary, China and iron mineralogy was determined by magnetic methods and Mossbauer spectroscopy. Changes in magnetic susceptibility, susceptibility of anhysteretic remanent magnetization, and saturation isothermal remanent magnetization were linked to changes of pseudo-single domain soft coercive components with minor antiferromagnetic fractions and the presence of minimal concentrations of superparamagnetic particles was confirmed by the no frequency dependent of AC magnetization. A positive correlation between L-ratio and hard isothermal remanent magnetization is congruent with the distribution of high-coercivity antiferromagnetic minerals. At 295 K, the Mossbauer spectrum of specimens was well fitted with a single magnetic sextet, hematite and two magnetic doublets, paramagnetic Fe2+ and paramagnetic Fe3+. The usefulness of magnetic data and Mossbauer spectroscopy could offer valuable analytical tools for tracking changes of iron speciation and phase in the intertidal conditions.
机译：潮间条件下对铁形态的研究很少，很少关注了解Fe3 + -Fe2 +的地球化学行为及其生物地球化学过程。在这里，在中国张江河口的云霄红树林中收集到一个沉积物核，并通过磁法和莫斯鲍尔光谱法测定了铁的矿物学。磁化率的变化，磁滞剩磁的磁化率和饱和等温剩余磁化的变化与反铁磁分数较小的拟单畴软矫顽成分的变化有关，并且通过不依赖于频率的交流证实了最低浓度的超顺磁性粒子的存在磁化。 L比与硬等温剩余磁化强度之间的正相关关系与高矫顽力反铁磁性矿物的分布有关。在295 K时，样品的Mossbauer光谱很好地拟合了一个单磁六边形，赤铁矿和两个复线，顺磁性Fe2 +和顺磁性Fe3 +。磁数据和Mossbauer光谱的有用性可以为跟踪潮间条件下铁的形态和相变提供有价值的分析工具。

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