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首页> 外文期刊>Geochimica et Cosmochimica Acta: Journal of the Geochemical Society and the Meteoritical Society >Sorption and desorption of dissolved organic phosphorus onto iron (oxyhydr)oxides in seawater
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Sorption and desorption of dissolved organic phosphorus onto iron (oxyhydr)oxides in seawater

机译：将溶解的有机磷吸附和解吸到海水中的氧化铁中

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摘要

Sorption of phosphorus (P) onto particulate surfaces significantly influences dissolved P concentrations in aquatic environments. We present results of a study contrasting the sorption behavior of several dissolved organic phosphorus (DOP) compounds and phosphate onto three commonly occurring iron (oxyhydr)oxides (Fe_(ox)): ferrihydrite, goethite, and hematite. The DOP compounds were chosen to represent a range of molecular weights and structures, and include: adenosine triphosphate (ATP), adenosine monophosphate (AMP), glucose-6-phosphate (G6P), and aminoethylphosphonic acid (AEP). All P compounds displayed decreasing sorption as a function of crystallinity of the Fe_(ox) substrate, with ferrihydrite adsorbing the most, hematite the least. In general, maximum sorption density decreased with increasing molecular weight of P compound; sorption of G6P onto goethite and hematite excepted. P compound size and structure, and the nature of the Fe_(ox) substrate all appear to play a role dictating relative sorption capacity. Failure of a simple, 1-step sorption-desorption model to describe the data suggests that P sorption cannot be explained by a simple balance between sorption and desorption. Instead, the data are consistent with a 2-step sorption model consisting of an initial rapid surface sorption, followed by a slow, solid-state diffusion of P from surface sites into particle interiors. Desorption experiments provide additional support for the 2-step sorption model. Without exception, DOP compounds showed less efficient sorption than did orthophosphate. This suggests that in aquatic systems enriched in reactive Fe_(ox), whether as suspended particulates in the water column or in benthic sediments, DOP bioavailability may exceed that of orthophosphate. Since biological uptake of P from DOP requires enzymatic cleavage of orthophosphate, a system enriched in DOP relative to orthophosphate may impact ecosystem community structure.
机译：磷（P）在颗粒表面的吸附会显着影响水生环境中溶解的磷浓度。我们目前的研究结果对比了几种溶解的有机磷（DOP）化合物和磷酸盐在三种常见的氧化铁（Fe_（ox））上的吸附行为：三水铁矿，针铁矿和赤铁矿。选择DOP化合物以代表一定范围的分子量和结构，包括：三磷酸腺苷（ATP），单磷酸腺苷（AMP），6-磷酸葡萄糖（G6P）和氨乙基膦酸（AEP）。所有的P化合物都显示出随着Fe_（ox）底物的结晶度降低的吸附作用，其中亚铁水合物吸附最多，赤铁矿吸附最少。通常，最大吸附密度随P化合物分子量的增加而降低; G6P在针铁矿和赤铁矿上的吸附除外。 P化合物的大小和结构以及Fe_（ox）底物的性质似乎都起着决定相对吸附容量的作用。一个简单的一步吸附-解吸模型无法描述数据表明，P的吸附不能用吸附和解吸之间的简单平衡来解释。取而代之的是，数据与两步吸附模型一致，该模型由初始的快速表面吸附，随后的P缓慢，固态扩散（从表面位置到颗粒内部）组成。解吸实验为两步吸附模型提供了额外的支持。无一例外，DOP化合物的吸附效率低于正磷酸盐。这表明在富含反应性Fe_（ox）的水生系统中，无论是作为水柱中还是底栖沉积物中的悬浮颗粒，DOP的生物利用度都可能超过正磷酸盐。由于从DOP吸收P的生物需要对正磷酸盐的酶促裂解，因此相对于正磷酸盐富含DOP的系统可能会影响生态系统的群落结构。

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