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首页> 外文期刊>Aquacultural Engineering: An International Journal >Fulvic acid increases iron bioavailability in aquaponic systems: Theoretical designs and practical considerations to prevent iron deficiency in plants
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Fulvic acid increases iron bioavailability in aquaponic systems: Theoretical designs and practical considerations to prevent iron deficiency in plants

机译：富含酸增加了Aquaponic系统中的铁生物利用度：理论设计和实践考虑，以防止植物的粘性缺乏症

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Plants grown in aquaponics frequently develop iron deficiency, which is generally corrected via supplementation with iron chelates. However, the solid waste excreted by fish contains considerable amounts iron, which are lost in the system by precipitation of insoluble iron oxides. Thus, the present study proposed the use of fulvic acid (FA), a humic substance with metal complexing capacity, to prevent iron precipitation and enhance its bioavailability in the aquaculture wastewater. An aquaponic solution was added with levels of fulvic acid (0, 69, 138, 345, and 690 mg L-1), and analyzed for dissolved iron after incubation and centrifugation. Visual MINTEQ was used to characterize and quantify the effect of fulvic acid levels on iron precipitation, species of possible solid forms, and concentration of dissolved bioavailable iron forms. Dissolved iron concentration increased with the inclusion of fulvic acid in the nutrient solution, and the highest iron concentration (22.4 mu M) was obtained by treating the solution with 690 mg L-1 of fulvic acid. Visual MINTEQ simulations demonstrated that, in the absence of fulvic acid, iron precipitated in the form of alpha Fe2O3, and the concentration of available iron increased with the inclusion of FA due to its complexing properties. Solution pH had no effect on iron availability with the absence of fulvic acid; in its presence, the effect of pH was only significant at values below 4.5. This study shows that fulvic acid seems to play an important role in transporting low-soluble iron from fish tanks to plant roots in aquaponic systems.
机译：在Aquaponics中生长的植物经常发展缺铁，这通常通过辅助用铁螯合物进行矫正。然而，鱼排出的固体废物含有相当大量的铁，通过不溶性氧化铁沉淀在系统中丢失。因此，本研究提出使用富甲酸（FA），具有金属络合能力的腐殖质物质，以防止铁沉淀并提高水产养殖废水中的生物利用度。加入水平水平的水平溶液（0,69,138,345和690mg L-1），并在孵育和离心后分析溶解铁。 Visual Minteq用于表征和量化富钙水平对铁沉淀，可能的固体形式的种类的影响，以及溶解的生物可利用的铁形式的浓度。溶解的铁浓度随着营养溶液中的包含富乙酸而增加，通过用690mg L-1的富甲酸处理溶液，获得最高的铁浓度（22.4μm）。视觉minteq模拟表明，在没有富甲酸的情况下，以αFe2O3的形式沉淀的铁，并且由于其络合性能，可获得的铁的浓度增加。溶液pH对缺乏富甲酸的铁可用性没有影响;在其存在下，pH的效果仅在低于4.5以下的值下显着。本研究表明，富钙酸似乎在从鱼缸运输到植物根系中的低可溶性铁来发挥重要作用。

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