Theoretical Speciation of Ethylenediamine-N-(o-hydroxyphenylacetic)-N‘-(p-hydroxyphenylacetic) Acid (o,p-EDDHA) in Agronomic Conditions

Yunta, Felipe; García‐Marco, Sonia; Lucena, Juan J.

doi:10.1021/jf034304r

Cited by 37 publications

(68 citation statements)

References 23 publications

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“…Percentage of Fe in solution was the same than the chelated Fe since no inorganic Fe forms are present in significant amounts. These results show the high stability of the Fe chelates used in this study (o,o-EDDHA and o,p-EDDHA) in agreement with other authors (Yunta et al, 2003a;López-Rayo et al, 2009). Results obtained for Zn in solution indicates than no precipitation occurs and that 100% of Zn was in solution in all the pH ranges.…”

Section: Theoretical Speciation Of Fe Mn and Zn Chelates In Hydroponsupporting

confidence: 92%

“…Synthetic polyamino polyphenolic polycarboxylic iron chelates are the most efficient soil fertilisers to treat iron chlorosis in plants growing in calcareous soil, the iron chelates derived from EDDHA/Fe 3+ being the standard treatment to alleviate this plant disease (Chen and Barak, 1982;Mengel and Kirby, 2001 (Cremonini et al, 2001;Hernández-Apaolaza et al, 2006). Although o,p-EDDHA/Fe 3+ can be used as an effective Fe source for plant nutrition Rojas et al, 2008), it presents lower stability than o,o-EDDHA/Fe 3+ (Yunta et al, 2003a) so other micronutrients can compete with Fe to bind with o,p-EDDHA. However, this fact could be useful to form chelates with other micronutrients, such as Mn and Zn, in order to obtain a fertiliser with several micronutrients in one product.…”

Section: Introductionmentioning

confidence: 99%

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Novel chelating agents as manganese and zinc fertilisers: characterisation, theoretical speciation and stability in solution

López-Rayo

Correas

Lucena

2012

Chemical Speciation & Bioavailability

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Mineral, complex and chelated micronutrient fertilisers are widely used in agriculture. However, there have been few studies on manganese and zinc fertilisers. In fact, specific chelating agents to provide these micronutrients to plants have not been found, in contrast to iron. This work considers the interactions of novel and traditional ligands in micronutrient mixtures used in hydroponics and fertigation. Theoretical speciation studies comparing the stability in solution have been carried out to simulate the possible interactions that can affect Fe, Mn and Zn in aqueous formulations containing these micronutrients. Unknown stability constants of ligands with Zn and Mn have been determined. Also, theoretical speciation investigations in hydroponic conditions have been carried out. It has been found that the new chelating agents, IDHA and EDDS, and the poorly studied o,p-EDDHA, can be good alternatives to the traditional sources such as EDTA, HEEDTA and DTPA principally for Zn fertilisers. The Mn and Zn chelates with o,p-EDDHA and complexes with lignosulfonate and gluconate have also shown high stability in a hydroponic nutrient solution, maintaining more than 80% Mn in solution until pH 10. The presence of o,o-EDDHA/Fe 3+ and o,p-EDDHA/Fe 3+ enhances the stability of Zn in solution in the mixed fertilisers. More studies with substrates are necessary to confirm these results and to extend them to other agronomic conditions.

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Section: Theoretical Speciation Of Fe Mn and Zn Chelates In Hydroponsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Novel chelating agents as manganese and zinc fertilisers: characterisation, theoretical speciation and stability in solution

López-Rayo

Correas

Lucena

2012

Chemical Speciation & Bioavailability

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“…A similar mechanism has been demonstrated for the adsorption of DOC to clay (Muneer and Oades 1989). The sixth position on the coordination complex of Fe chelated by o,p-EDDHA is not occupied by a phenolic hydroxyl group of the chelating agent, but, depending on pH, by either a separate hydroxide anion or a water molecule (Yunta et al 2003a) (Fig. 1c).…”

Section: Reactive Surfacessupporting

confidence: 71%

The behaviour of EDDHA isomers in soils as influenced by soil properties

et al. 2006

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FeEDDHA products are applied to correct iron chlorosis in plants and consist of a mixture of EDDHA isomers chelated to iron. In this study such mixtures have been divided into four (groups of) isomers: racemic o,o-EDDHA, meso o,o-EDDHA, o,p-EDDHA and rest-EDDHA. The physical and chemical properties of these isomers differ and hence does their ability to deliver Fe to plants. To come to a soil-specific iron fertilization recommendation, the behaviour of the EDDHA isomers in the soil needs to be understood. This behaviour has been examined in a soil interaction experiment as a function of time, and it has been related to soil properties. The isomer fractions remaining in solution can be ranked racemic

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“…These isomers are o,o-EDDHA, o,p-EDDHA and p,p-EDDHA (1, 2 and 3, respectively, in Figure 1), which show different abilities to chelate metallic ions, the o,o-EDDHA being the most efficient chelating agent, because of its high stability metallic complexes (Yunta et al, 2003b).…”

Section: Introductionmentioning

confidence: 99%

Iron sources for citrus rootstock development grown on pine bark/vermiculite mixed substrate

Ferrarezi

Bataglia

Furlani

et al. 2007

Sci. agric. (Piracicaba, Braz.)

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For high technology seedling production systems, nutrition plays an important role, mainly the fertigation with iron chelates to prevent its deficiency. This study had the goal of searching for alternative iron sources with the same nutrient efficiency but lower cost in relation to nutrient solution total cost. An experiment was carried out in 56 cm 3 -conic-containers tilled with a pine bark/ vermiculite mixed substrate using Fe-DTPA, Fe-EDDHA, Fe-EDDHMA, Fe-EDTA, Fe-HEDTA, FeCl 3 , FeSO 4 , FeSO 4 +citric acid plus a control, and the rootstocks Swingle, Rangpur, Trifoliata and Cleopatra, in a randomized complete block design, with four replicates. Seedlings were evaluated for height, relative chlorophyll index, total and soluble iron leaf concentrations. Cleopatra was the only rootstock observed without visual iron chlorosis symptoms. There was a low relative chlorophyll index for Rangpur, Swingle and Trifoliata rootstocks in the control plots, in agreement with the observed symptoms. High total iron concentrations were found in the control and Fe-EDTA plots, whereas soluble iron represented only a low percent of the total iron. The economical analysis showed the following cost values of iron sources in relation to the nutrient solution total costs: Fe-HEDTA (37.25%) > FeCl 3 (4.61%) > Fe-EDDHMA (4.53%) > Fe-EDDHA (3.35%) > Fe-DTPA (2.91%) > Fe-EDTA (1.08%) > FeSO 4 +citric acid (0.78%) > FeSO 4 (0.25%). However, only plants from Fe-EDDHA and Fe-EDDHMA treatments did not present any deficiency visual symptoms. The relative cost of Fe-EDDHA application is low, its efficiency in maintaining iron available in solution resulted in high plant heights, making it recommendable for citric rootstock production in nurseries.

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Theoretical Speciation of Ethylenediamine-N-(o-hydroxyphenylacetic)-N‘-(p-hydroxyphenylacetic) Acid (o,p-EDDHA) in Agronomic Conditions

Cited by 37 publications

References 23 publications

Novel chelating agents as manganese and zinc fertilisers: characterisation, theoretical speciation and stability in solution

Novel chelating agents as manganese and zinc fertilisers: characterisation, theoretical speciation and stability in solution

The behaviour of EDDHA isomers in soils as influenced by soil properties

Iron sources for citrus rootstock development grown on pine bark/vermiculite mixed substrate

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