Ethylenediaminetetraacetic acid, solution

Lee SH, Koo HY, Lee SM, Kang YC (2010) Characteristics of Y3AI5O12 Ce phosphor powders prepared by spray pyrolysis from ethylenediaminetetraacetic acid solution. Ceram Int 36 611-615... 

Test E Variation of the ternary solvent mixture. According to the standard operation procedure for sample preparation equal amounts (by volume) of CDCI3, methanol and Cs-EDTA (caesium ethylenediaminetetraacetic acid) solution were used. Cs-EDTA was held constant at 1 ml, CDCI3 was changed from 1 ml to 0.6 ml and MeOH from 1 ml to 1.4 ml. 

EDTA (ethylenediaminetetraacetic acid, [60-00-4]) chelates any trace metals that would otherwise decompose the hydrogen peroxide [7722-84-1]. The amine is preheated to 55—65°C and the hydrogen peroxide is added over one hour with agitation the temperature is maintained between 60 —70°C. The reaction is exothermic and cooling must be appHed to maintain the temperature below 70°C. After all the peroxide has been added, the temperature of the reaction mixture is raised to 75°C and held there from three to four hours until the unreacted amine is less than 2.0%. The solution is cooled and the unreacted hydrogen peroxide can be destroyed by addition of a stoichiometric amount of sodium bisulfite. This may not be desirable if a low colored product is desired, ia which case residual amounts of hydrogen peroxide enhance long-term color stabiUty. 

A method suitable for analysis of sulfur dioxide in ambient air and sensitive to 0.003—5 ppm involves aspirating a measured air sample through a solution of potassium or sodium tetrachloromercurate, with the resultant formation of a dichlorosulfitomercurate. Ethylenediaminetetraacetic acid (EDTA) disodium salt is added to this solution to complex heavy metals which can interfere by oxidation of the sulfur dioxide. The sample is also treated with 0.6 wt % sulfamic acid to destroy any nitrite anions. Then the sample is treated with formaldehyde and specially purified acid-bleached rosaniline containing phosphoric acid to control pH. This reacts with the dichlorosulfitomercurate to form an intensely colored rosaniline—methanesulfonic acid. The pH of the solution is adjusted to 1.6 0.1 with phosphoric acid, and the absorbance is read spectrophotometricaHy at 548 nm (273). 

A mixture of dimethyl sulfate with SO is probably dimethyl pyrosulfate [10506-59-9] CH2OSO2OSO2OCH2, and, with chlorobenzene, it yields the 4,4 -dichlorodiphenylsulfone (153). Trivalent rare earths can be separated by a slow release of acid into a solution of rare earth chelated with an ethylenediaminetetraacetic acid agent and iodate anion. As dimethyl sulfate slowly hydrolyzes and pH decreases, each metal is released from the chelate in turn and precipitates as the iodate, resulting in improved separations (154). 

From this material, samples are cut and swelled to constant weight in a buffered saline solution prepared from 8.43 g sodium chloride (NaCl), 9.26 g boric acid (H3BO3), 1.0 g sodium borate (Na3B03), and 0.1 g of the disodium salt of the dihydrate of ethylenediaminetetraacetic acid [Na2 EDTA -(/ 0)21 ini L of distilled water. 

Takahashi M, Muramatsu Y, Suzuki T, Sato S, Watanabe M, Wakita K, Uchida T (2003) Preparation of Bi2Te3 films by electrodeposition from solution containing bi-ethylenediaminetetraacetic acid complex and Te02. J Electrochem Soc 150 C169-C174... 

A detailed physical examination of the purple complex formed in alkaline solution between Fe(III), ethylenediaminetetraacetic acid (EDTA) and peroxide shows it to have a composition [Fe "(EDTA)02] (togA, 3 c =4.33). This complex catalyses decomposition of peroxide, the rate-pH profile going through a maximum at pH 9-10 . 

A 1-liter three-necked flask was fitted with a Claisen head equipped with two dropping funnels, a mechanical stirrer, and a pH electrode. A solution containing 5g (0.012 mol) of the dye prepared above, 210 ml of water, and 0.2 g of ethylenediaminetetraacetic acid was added to the flask and stirred, while 250 ml of methylene chloride was added. The system was closed and flushed with argon, the pH was adjusted to 10, then 2.44 g (0.014 mol) of sodium dithionite was added. The solution turned orange and the pH dropped to 3.7. Aqueous 25% NaOH solution was added to bring the pH to 4.5, and then 7.53 g (0.027 mol) of 4-phenylsulfonylbenzoylchloride in 60 ml of methylene chloride was added dropwise. After l h the pH was raised to 10-11. The methylene chloride layer was separated and dried over... 

Precipitation of Fe(IIl) compounds from acid solutions as the pH increases above 2.2 is a particular problem. Complexing agents that have been used include 5-sulfosalicylic acid and citric acid (136) dihydroxymaleic acid (137) ethylenediaminetetraacetic acid (138) lactic acid (138) blends of hydroxylamine hydrochloride, citric acid, and glucono-delta-lactone (139) nitriloacetic acid blends of citric acid and acetic acid lactic acid and gluconic acid (140). 

Another attempted synthesis of Tc(III)-EDTA and Tc(III)-HEDTA complexes (EDTA ethylenediaminetetraacetic acid HEDTA A -(2-hydroxy-methyl)ethylenediamine-N,AT, iV -triacetic acid) was carried out using [Tc(tu)6]3+ as the starting complex [40]. Technetium-EDTA complexes have been synthesized by the direct reduction of pertechnetate with a suitable reduc-tant in the presence of excess EDTA [41-43]. On addition of EDTA to the Tc(tu) + solution, the intensity of the absorption spectrum decreased with time and the solution color changed from reddish orange to light brown. An electrophoretic analysis for the Tc(III)-EDTA complex showed that more than 70%... 

It is common for acid extracting solutions to contain ligands, such as fluoride, that, when combined with metals, increase their solubility. Chelates such as ethylenediaminetetraacetic acid (EDTA), which combine with metals and either bring them into solution or keep them in solution, are also commonly used. 

As heavy metals were known to influence the degradation pathway, experiments were carried ont to determine if excess levels of metals could be the root cause of the degradation. EDTA (ethylenediaminetetraacetic acid) is a known metal chelator and is often used in ampoule formulations. The addition of EDTA to samples of ampoule solutions prepared in the lab was shown to halt the degradation (Table 2). 

A common reagent used in complexometric titrations is ethylenediaminetetraacetic acid (EDTA). It is often used to determine the concentration of metal ions present in a solution. 

Electroless Deposition of Copper. The basic ideas of the mixed-potential theory were tested by Paunovic (10) for the case of electroless copper deposition from a cupric sulfate solution containing ethylenediaminetetraacetic acid (EDTA) as a complexing agent and formaldehyde (HCHO) as the reducing agent (Red). The test involved a comparison between direct experimental values for and the rate of deposition with those derived theoretically from the current-potential curves for partial reactions on the basis of the mixed-potential theory. 

Cell lysis buffer stock solution (lOx) 1.21 g Tris base (pH 7.4), 4.39 g NaCl, 0.19 g ethylenediaminetetraacetic acid (EDTA), 0.19 g ethylene glycol tetraacetic acid (EGTA),... 

Radium in hydrochloric acid solution may be separated effectively by ion exchange methods using cation exchange-resin columns. A weak HCl solution is passed through the column. The absorbed metals on the ion-exchange column are eluted with ethylenediaminetetraacetic acid (EDTA) at pH 6.25 or with ammonium citrate at pH 7.8. With either eluant, radium is eluted last, after removing barium and then lanthanum, calcium, magnesium, and other metals. 

Ethylenediaminetetraacetic acid disodium salt dehydrate (EDTA) buffer solution... 

Sodium acetate p.a. (Merck) stock solution sodium acetate (1 M) is prepared by dissolving 82 g of sodium acetate and 375 mg ethylenediaminetetraacetic acid (EDTA) in 1000 ml H20. 

Fibroblast cultures for each patient and control are grown to confluency in T-75 culture flasks. The assay is then performed in triplicate using six-well plates. First, 1 ml of 0.25% trypsin-ethylenediaminetetraacetic acid (EDTA) solution (Sigma T4049) is added to each T-75 flask. After the cells have lifted from the flask, they are resuspended in 6 ml complete MEM. A 1-ml aliquot of the cell suspension is transferred to a 50-ml conical tube containing 14 ml of MEM complete medium (see above). Following further resuspension, 4 mL is plated into each of three wells in a six-well culture plate and placed into an incubator. Once the cells have attached to the seeded plates and are approximately 90-100% confluent (3-4 days), complete MEM is replaced with 1.5 ml of complete IVPM (see above). 

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