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首页> 外文期刊>海洋理工学会誌 >Characterization and binding of Fe (II) in organic matter in a fertilizer including steel slag and compost to supply soluble Fe (II) to barren ground in coastal areas
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Characterization and binding of Fe (II) in organic matter in a fertilizer including steel slag and compost to supply soluble Fe (II) to barren ground in coastal areas

机译：包括钢渣和堆肥在内的肥料中有机物中铁（II）的表征和结合，以向沿海地区的贫瘠土地供应可溶性铁（II）

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摘要

One reason for the evolution of barren ground in coastal areas is a deficiency of dissolved Fe (II) species. A fertilizer that included steel slag and compost was evaluated, in an attempt to supply dissolved Fe (II) to coastal such areas. Basing on previously reported data, it is thought that the presence of fulvic acid (FA) in the compost permits Fe (II) in the steel slag to be eluted in the form of Fe (II) -FA complexes. However, in our observation and some previous reports, humic acid (HA) and FA are flocculated and precipitated in seawater, which suggests that FA cannot function as a carrier for the elution of Fe (II) from the fertilizer. To better understand the mechanisms that control the elution of Fe (II) from such a fertilizer, this paper introduced following two topics: (1) the seawater extractable organic matter (SEOM) in the compost and its binding to Fe (II), and (2) the alteration of HA in the fertilizer during fertilization. For the first topic, the SEOM contained less carboxylic and phenolic hydroxyl groups that can serve as binding sites to Fe (II), compared to HA and FA. However, the binding constant of the Fe (II) -SEOM complex was comparable to that of the Fe (II) -fulvic acid complex. These results suggest that SEOM in the compost has strong binding sites to Fe (II) and can serve as a carrier of Fe (II) in seawater. For the second topic, the structural features of the organic matter in the fertilizer were monitored during 6 months of fertilization, in which HA was characterized as an abundant organic matter in the fertilizer. While no significant structural alterations of the HA were observed in the absence of steel slag, the structures were dramatically altered in the presence of steel slag. Higher levels of sulfur and a fatty acid biomarker (C_(16:lω7)) were found in the HA after fertilization, suggesting that sulfate reducing bacteria are involved in the observed structural alterations.
机译：沿海地区贫瘠土地演变的原因之一是缺乏溶解的Fe（II）物种。对包括钢渣和堆肥的肥料进行了评估，以尝试向沿海地区提供溶解的铁（II）。根据先前报道的数据，认为堆肥中存在富勒酸（FA）可使铁渣中的Fe（II）以Fe（II）-FA络合物的形式洗脱。然而，在我们的观察和以前的报道中，腐殖酸（HA）和FA在海水中絮凝并沉淀，这表明FA不能充当从肥料中洗脱Fe（II）的载体。为了更好地了解控制从这种肥料中洗脱Fe（II）的机理，本文介绍了以下两个主题：（1）堆肥中的海水可萃取有机物（SEOM）及其与Fe（II）的结合，以及（2）施肥过程中肥料中HA的变化。对于第一个主题，与HA和FA相比，SEOM包含的羧基和酚羟基较少，可作为与Fe（II）的结合位点。但是，Fe（II）-SEOM络合物的结合常数与Fe（II）-富里夫酸络合物的结合常数相当。这些结果表明，堆肥中的SEOM与Fe（II）具有很强的结合位点，可以作为海水中Fe（II）的载体。对于第二个主题，在施肥6个月期间监测肥料中有机物的结构特征，其中HA被表征为肥料中丰富的有机物。尽管在没有钢渣的情况下没有观察到HA的明显结构变化，但在有钢渣的情况下其结构发生了显着变化。受精后在HA中发现较高水平的硫和脂肪酸生物标记（C_（16：1ω7）），这表明所观察到的结构改变与硫酸盐还原菌有关。

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