A New Chelating Agent, α, α′-Diamino-o-xylene-N,N,N′,N′-tetraacetic Acid

1966 ◽  
Vol 39 (9) ◽  
pp. 2053-2053 ◽  
Author(s):  
Takeshi Ando ◽  
Keihei Ueno
Keyword(s):  
Chelating Agent ◽  
Tetraacetic Acid

PHYTOREMEDIATION OF CADMIUM-CONTAMINATED SOIL BY BRASSICA SPECIES

2001 ◽  
Vol 49 (4) ◽  
pp. 351-360 ◽  
Author(s):  
K. S. AHMED ◽  
◽  
Keyword(s):  
Brassica Juncea ◽  
Contaminated Soil ◽  
Indian Mustard ◽  
Chelating Agent ◽  
Brassica Species ◽  
Green Technology ◽  
Tetraacetic Acid ◽  
Toxic Heavy Metals ◽  
Stem Leaf ◽  
Cadmium Contaminated Soil

Phytoremediation is a green technology for the sustainable remediation of surface soils contaminated with toxic heavy metals. When added to soils the chelating agent ethylenediamine tetraacetic acid (EDTA) increased the solubility of heavy elements for plant uptake during phytoremediation. A greenhouse experiment was carried out with two Brassica species (Brassica juncea and Brassica carinata) grown on artificially contaminated soil (20 and 40 mg Cd kg-1) with EDTA added at a rate of 1 g kg-1 soil. With increasing Cd (0, 20 and 40 mg Cd kg-1 soil) contamination the biomass of both the Brassica species decreased. However, Brassica juncea was more tolerant of high levels of Cd in the soil in comparison to B. carinata. The results indicated that EDTA made the cadmium more available to the plants and lowered the Cd content of the soil. The magnitude of the increase in tissue (stem, leaf and root) Cd concentration was higher in B.juncea than in B. carinata and after the application of chelating agent (EDTA). The Brassica juncea species of Indian mustard has better potential for the phytoremediation of soil heavily contaminated with Cd (40 mg Cd kg-1 soil).

scholarly journals Kinetics and Possible Mechanisms of the Ce(IV) Oxidation of EDTA, CDTA, DTPA and NTA in Perchloric Acid Media

1975 ◽  
Vol 30 (5-6) ◽  
pp. 409-415 ◽  
Author(s):  
Samir B. Hanna ◽  
William R. Cabrroll ◽  
Salem A. Attiga ◽  
William H. Webb
Keyword(s):  
Acid Concentration ◽  
Perchloric Acid ◽  
Chelating Agents ◽  
Chelating Agent ◽  
Nitrilotriacetic Acid ◽  
Stopped Flow ◽  
Tetraacetic Acid ◽  
Diethylenetriaminepentaacetic Acid ◽  
Acid Media ◽  
Oxidation Decrease

The rates of oxidation of four chelating agents with Ce(IV) in HClO4 solutions, have been studied by the stopped-flow technique. The rates first increase with increasing acidity, reach maxima which are characteristic of the chelating agent and the medium, then progressively decrease with further increasing acid concentration. At their maximum reactivities, the tendencies for oxidation decrease in the following order: trans-1,2-diaminocyclohexane tetraacetic acid (CDTA) > ethylenedinitrilotetraacetic acid (EDTA) > diethylenetriaminepentaacetic acid (DTPA) > nitrilotriacetic acid (NTA). A mechanism for the oxidation of EDTA, involving Ce4+ and Ce(OH)8+ and both unprotonated and monoprotonated chelating agent, is proposed.

scholarly journals A NEW METHOD FOR CONSTANT ESTIMATE STABILITY OF COMPLEX WITH EDTA

2019 ◽  
Vol 16 (33) ◽  
pp. 148-158
Author(s):  
F. C. PEREIRA ◽  
F. J. S. LIMA
Keyword(s):  
Alkali Metals ◽  
Ph Value ◽  
Wide Spectrum ◽  
Chelating Agent ◽  
Food Product ◽  
Complexing Agent ◽  
Human Consumption ◽  
Chloride Salt ◽  
Tetraacetic Acid ◽  
Chemical Laboratory

The present work describes a new methodology in analytical chemistry, which makes it possible to calculate the stability constant (equilibrium or formation) of the coordination compounds generated between all metallic cations in the periodic table, except for alkali metals (group 1 ) together with the ethylene diamine tetraacetic acid binder. The system is simple to use, inexpensive, and allows the knowledge of the size of the conditional formation constants for all metals coordinated with the complexing agent to be investigated at any pH value investigated. In addition, the method is also extensive for other binders having the same chemical reaction property as ethylenediamine tetraacetic acid performs with metal ions in the same stoichiometric bonding ratio. For the execution of this study, solutions of copper (II) cation was employed, at a concentration of 1.0x10-2 mol L-1 and the complexing agent, also presenting the same concentration of metal. The assay was conducted in a buffering system consisting of ammonium hydroxide and ammonium chloride salt at a constant pH of 10.0. The method allows its use in experimental procedures developed both in a chemical laboratory and in a classroom, used during the theoretical activities. The chelating agent has a wide spectrum of application in the food product industries, also in the generation of cleaning materials in general, as well as in the photography industry, textile production, paper manufacture and the like, rubbers and the like, polymers and derivatives, among other production lines intended for its manufacture for human consumption.

ChemInform Abstract: Preparation of Highly Active NiW Hydrotreating Model Catalysts with 1,2-Cyclohexanediamine-N,N,N′N′-tetraacetic Acid (CyDTA) as a Chelating Agent.

ChemInform ◽  
2000 ◽  
Vol 31 (40) ◽  
pp. no-no ◽  
Author(s):  
G. Kishan ◽  
L. Coulier ◽  
V. H. J. de Beer ◽  
J. A. R. van Veen ◽  
J. W. Niemantsverdriet
Keyword(s):  
Chelating Agent ◽  
Model Catalysts ◽  
Tetraacetic Acid ◽  
Highly Active

scholarly journals Calcium Variously Mediates the Effect of Cytokinin on Chlorophyll and LHCPII Accumulation During Greening in Barley Leaves and Cucumber Cotyledons

2015 ◽  
Vol 56 (2) ◽  
pp. 27-34 ◽  
Author(s):  
Jolanta Legocka ◽  
Ewa Sobieszczuk-Nowicka
Keyword(s):  
Photosystem Ii ◽  
Channel Blocker ◽  
Indirect Evidence ◽  
Chelating Agent ◽  
Tetraacetic Acid ◽  
Plant Materials ◽  
Hormonal Effect ◽  
Chlorophyll Accumulation ◽  
Barley Leaves ◽  
Cucumber Cotyledons

Abstract During greening, excised etiolated barley leaves and cucumber cotyledons that were depleted of exogenous Ca2+ by a chelating agent (ethylene glycol-bis (beta aminoethyl ether)-N,N,N`N`-tetraacetic acid, EGTA) showed ∼50% reduced chlorophyll (Chl) accumulation and ∼30% accumulation of apoprotein of the light-harvesting chlorophyll a/b-binding protein complex of photosystem II (LHCPII). The Ca2+ channel blocker lanthanum chloride (LaCl3) applied to cucumber cotyledons reduced LHCPII accumulation more than EGTA did. In both plant mate-rials, cytokinins enhanced chlorophyll accumulation by 50-60% and this effect was completely canceled by EGTA application. Hormones significantly increased LHCPII accumulation but EGTA application reduced that effect in barley leaves by ∼30% and in cucumber cotyledons by ∼80%. A similar effect was observed in LaCl3-treated cotyledons. CaCl2 application boosted chlorophyll accumulation in both plant materials. CaCl2 applied together with cytokinin reduced the hormonal effect on chlorophyll accumulation by ∼38% in barley leaves and 23% in cucumber cotyledons, but almost totally inhibited cytokinin-stimulated LHCPII accumulation. Our results indicate that calcium variously mediates the effect of cytokinin on chlorophyll and LHCPII accumulation. Cytokinin-induced enhancement of chlorophyll accumulation seems totally dependent on the exogenous pool of Ca2+, while Ca2+-dependent and Ca2+-independent pathways are involved in the hormonal effect on LHCPII accumulation. The effect of cytokinin on the increase of light-induced LHCPII accumulation appears to be sensitive to exogenously applied Ca2+, which almost totally blocked the hormonal effect. Our results give indirect evidence that the responses to cytokinin and light act on different events leading to Chl and LHCPII accumulation.

Preparation of highly active NiW hydrotreating model catalysts with 1,2-cyclohexanediamine-N,N,N′N′-tetraacetic acid (CyDTA) as a chelating agent

2000 ◽  
pp. 1103-1104 ◽  
Author(s):  
G. Kishan ◽  
L. Coulier ◽  
V. H. J. de Beer ◽  
J. A. R. van Veen ◽  
J. W. Niemantsverdriet
Keyword(s):  
Chelating Agent ◽  
Model Catalysts ◽  
Tetraacetic Acid ◽  
Highly Active

scholarly journals Aluminium Involvement in Neurotoxicity

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Alessandro Fulgenzi ◽  
Daniele Vietti ◽  
Maria Elena Ferrero
Keyword(s):  
Multiple Sclerosis ◽  
Environmental Factors ◽  
Neurodegenerative Diseases ◽  
Ethylene Diamine Tetraacetic Acid ◽  
Toxic Metals ◽  
Healthy Subjects ◽  
Environmental Pollutants ◽  
Chelating Agent ◽  
Tetraacetic Acid ◽  
Intravenous Treatment

The aetiology of neurodegenerative diseases (ND) seems to involve susceptibility genes and environmental factors. Toxic metals are considered major environmental pollutants. Following our study of a case of multiple sclerosis (MS) improvement due to removal of aluminium (Al) and other toxic metals, we have examined the possible relationship between Al intoxication and ND. We used the slow intravenous treatment with the chelating agent EDTA (calcium disodium ethylene diamine tetraacetic acid) (chelation test) to remove Al and detected it in the urine collected from the patients for 12 hours. Patients affected by MS represented 85.6% of total ND. Al was present in 44.8% of cases comprehensive of ND and healthy patients. Al levels were significantly higher in ND patients than in healthy subjects. We here show that treatment of patients affected by Al burden with ten EDTA chelation therapies (EDTA intravenous administration once a week) was able to significantly reduce Al intoxication.

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