Iron ethylenediaminetetraacetic acid

Aelterman et al. demonstrated that it is possible to replace ferricyanide with an iron ethylenediaminetetraacetic acid (Fe-EDTA) catholyte [68]. Although the maximum power was 50% lower, no replenishment of the Fe-EDTA catholyte was needed. Simply pyrolyzing carbon mixed iron-chelated ethylenedia-minetetraacetic acid (PFeEDTA/C) in an argon atmosphere may greatly improve its performance, with quaternary N-iron as the possible active site for the oxygen reduction reaction [48]. The MFC with a PFeEDTA/C cathode produced a maximum power density of 1122 mW m , which was close to that with a Pt/C cathode (1166 mW m ) and which was stable during an operation period of 31 days. 

Wang, X, Liang, P., Zhang, J., and Huang, X. (2011) Activity and stability of pyrolyzed iron ethylenediaminetetraacetic acid as cathode catalyst in microbial fuel cells. Bioresource Technology, 102 (8), 5093-5097. 

Chromium (ITT) can be analy2ed to a lower limit of 5 x 10 ° M by luminol—hydrogen peroxide without separating from other metals. Ethylenediaminetetraacetic acid (EDTA) is added to deactivate most interferences. Chromium (ITT) itself is deactivated slowly by complexation with EDTA measurement of the sample after Cr(III) deactivation is complete provides a blank which can be subtracted to eliminate interference from such ions as iron(II), inon(III), and cobalt(II), which are not sufficiently deactivated by EDTA (275). 

Iron can be controlled with certain complexing agents, in particular glucono-5-lactone, citric acid, ethylenediaminetetraacetic acid, nitrilotriacetic acid, hydroxyethylethylene diaminetriacetic acid, hydroxyethyliminodiacetic acid, and the salts from the aforementioned compounds. These compounds must be added together with nitrogen-containing compounds such as hydroxylamine salts or hydrazine salts [486,643,1815]. 

Figure 17-26. Complexing agents for iron control glucono-6-lactone, nitrilotriacetic acid, hydroxyethylene diaminetetraacetic acid, and ethylenediaminetetraacetic acid.

One of the earlier observations concerning the activation process was that it was inhibited by iron chelators (9,27). Kennedy et al. (46) demtmstrated that the metal chelator ethylenediaminetetraacetic acid (EDTA) inlubits the activation process, even... 

Secondary antioxidants, i.e., sequestrants or chelators, are important compounds in the prevention of lipid oxidation. The effect of chelators tested varied with the different compounds. Of those chelators tested, ethylenediaminetetraacetic acid (EDTA, tetrasodium salt) and sodium phytate were the most effective inhibitors of lipid oxidation (so indicated by low hexanal and TEARS values) and MFD (as seen by high CBB and low PIT and CBD intensity values), see Table 5. Sodium phytate was previously shown to chelate iron and thus, was proposed as a food antioxidant(7J). Sodium citrate at a concentration of 500... 

Iion(II) ethylenediaminetetraacetic acid [15651 -72-6], Fe(EDTA) or N,.NM,2-ethanediylbis[IV-(carboxymethyl)glycinato]ferrate(2—), is a colorless, air-sensitive anion. It is a good reducing agent, having E° = —0.117 V, and has been used as a probe of outer sphere electron-transfer mechanisms. It can be prepared by addition of an equivalent amount of the disodium salt, Na2H2EDTA, to a solution of iron(II) in hydrochloric acid. Diammonium [56174-59-5] and disodium [14729-89-6] salts of Fe(EDTA) 2— are known. 

Croft et al. [15] reported significant increases in kt when iron was chelated by DTPA, ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), and several aminophosphonic acids. Compared to aqueous Fe2+, increases in /cj from 1000-fold to 50,000-fold were indicated. They also note that DTPA inhibits reaction (3). Graf et al. [10] suggest that reaction (3) is completely inhibited by DTPA, EHPG, phytate, and desferal. These two studies are not entirely consistent in their findings, possibly due to the... 

EDTA Complexes. Ethylenediaminetetraacetic acid (EDTA) and its homologues form the most stable known complexes of plutonium. This discussion will be limited to EDTA, which is most likely to be found in the environment as a result of its use as a medium for the addition of soluble iron to soils. The equilibrium constant for formation of the 1 1 chelate of plutonium(III), as given by the expression... 

Chelants at concentrations of 0.1 to 0.2% improve the oxidative stabihty through the complexation of the trace metal ions, eg, iron, which catalyze the oxidative processes. Examples of the chelants commonly used are pentasodium diethylenetriaminepentaacetic acid (DTPA), tetrasodium ethylenediaminetetraacetic acid (EDTA), sodium etidronate (EHDP), and citric acid. Magnesium silicate, formed in wet soap through the reaction of magnesium and siHcate ions, is another chelant commonly used in simple soap bars. 

Ethylenediaminetetraacetic acid (EDTA) is a chelating agent that binds certain metals, especially iron and copper, which are essential to the nutrition of certain microorganisms. In this manner, it is a strong booster or enhancer of the activity of preservatives especially the parabens. Alone, it has the ability to increase the permeability of the bacterial cell wall and can kill Pseudomonas aeruginosa and E. coli by this activity effective concentration is 0.05-0.10%. 

Oral iron preparations Ferrous sulfate (tablets) Ferrous fumarate (tablets) Ferrous gluconate (tablets) Ferrous glycine sulfate (tablets or solution) Ferrous succinate (solution ) Sodium ironedetate (solution) Iron(ii) sulfate (40-105 mg Fe ) Iron(ii) fumarate (65-10 mg Fe ) Iron(ii) gluconate (35 mg Fe) Iron(n) glycine sulfate (25 100 mg Fe ) Iron(ii) succinate (37 mg Fe) Iron(n) chelate of ethylenediaminetetraacetic acid (FLDTA) (27.5 mg Fe)... 

Imanari et al. has reported a spectrophotometric detection of many inorganic anions using a post-column reactor [42]. A stream of ferric perchlorate, which is essentially colorless, is mixed with the column effluent. The ferric perchlorate is colorless because perchlorate is a poor complexing anion, but most anions will complex the iron and form colored species that can be detected at 330-340 nm (Table 4.3). A similar detection method works for ions such as orthophosphate, pyrophosphate, nitrilo-triacetic acid (NTA), and ethylenediaminetetraacetic acid (EDTA) [46]. 

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