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Iron and ligand are absorbed separately by the plant roots whereby the highly stable ferric chelate is first reduced to the less stable ferrous chelate. [6] In horticulture, iron chelate is often referred to as 'sequestered iron' and is used as a plant tonic, often mixed with other nutrients and plant foods (e.g. seaweed).
Ethylenediaminetetraacetic acid (EDTA), also called EDTA acid, is an aminopolycarboxylic acid with the formula [CH 2 N(CH 2 CO 2 H) 2] 2. This white, slightly water-soluble solid is widely used to bind to iron (Fe 2+ /Fe 3+ ) and calcium ions (Ca 2+ ), forming water-soluble complexes even at neutral pH.
Metal chelate compounds are common components of fertilizers to provide micronutrients. These micronutrients (manganese, iron, zinc, copper) are required for the health of the plants. Most fertilizers contain phosphate salts that, in the absence of chelating agents, typically convert these metal ions into insoluble solids that are of no ...
Iron can be made available immediately to the plant by the use of iron sulphate or iron chelate compounds. Two common iron chelates are Fe EDTA and Fe EDDHA. Iron sulphate (Iron(II) sulfate) and iron EDTA are only useful in soil up to PH 7.1 but they can be used as a foliar spray (Foliar feeding).
Sprint 138 iron chelate is produced as Na-Fe-EDDHA (C 18 H 16 FeN 2 NaO 6), while Hoagland's original solution formulations contain ferric tartrate (C 12 H 12 Fe 2 O 18), but no sodium ions. [1] [2] [3] Synthesizing a sodium-free ferric EDTA complex (C 10 H 12 FeN 2 O 8 −) in a laboratory is sometimes preferred to buying ready-made products.
Chelation removes, when it works right, metal ions from a solution. It matters not whether the solution is a river, an ocean, or a sample in a test tube. --Smokefoot 13:52, 5 December 2016 (UTC) The use of chelation in environmental remediation (not just rivers) seems like a notable application that is worth mentioning in this article.