Salt of ethylenediamine-tetraacetic acid

The difficulty in obtaining this monomer in the pure state arises from the fact that the known methods of preparation involve the simultaneous formation of considerable amounts of the isomers of spiropentane which are difficult to remove. The method adopted as giving the most satisfactory yields is that of Applequist, Fanta, and Henrickson (I, 2). The spiropentane is prepared by reaction of zinc dust with pentaerythrityl tetrabromide in alcohol in presence of the sodium salt of ethylenediamine-tetraacetic acid as complexing agent. The yield of hydrocarbon (spiropentane plus various ethylenic compounds) is of the order of 84%. The spiropentane is obtained in the pure state by treating the mixture with bromine in dibromomethane. The yield of pure spiropentane was found to be 62%. 

BURCENE 100 is an aqueous solution of the tetrasodium salt of ethylenediamine tetraacetic acid. It is very versatile chelating agent for controlling unwanted metal ions over a broad pH range. 

Sodium formaldehyde sulfoxylate Tetrasodium salt of ethylenediamine tetraacetic acid (EDTA)... 

All the reagents were of analytical reagent grade and all the solutions were prepared in doubly distilled (first time from alkaline KMnO ) and CO free deionized water. A solution of paracetamol (99%, Acros organics, NJ, USA) 1.0 °— 10 mol dm was prepared by dissolving 0.151 g of paracetamol in water, and the solution was diluted to the mark in 100 cm3 volumetric flask. Stock Solutions of potassium dichromate (1.0 °— 10 mol dm" ) and manganese(II) chloride (1.0°—10" mol dm" ), disodium salt of ethylenediamine tetraacetic acid (EDTA) (1.0°— 10 mol dm ), and sodiumdodecyl sulphate (SDS) (1.0°—10 mol dm ) were prepared in a similar manner. The solution of EDTA was stored in a polythene... 

Cobalt salts and oxides are used in the glass industry, for paints and colored pottery (10). They are also used as fodder additives for ruminants, as fertilizers, as catalysts in chemistry, as vitamin and radiation sources ( Co in medicine), as amalgam in dentistry, and as antidotes of cyanides in the form of ethylenediamine tetraacetic acid (EDTA) complexes. Several years ago, C0SO4, C0CI2, and Co(OAc)2 were used as foam stabilizers in the brewing of malt beverages. This is no longer allowed due to the cardiovascular diseases that were induced. 

Ethylenediamine tetraacetic acid (EDTA) [60-00-4] (Sequestrene), an anticoagulent at 1 mg of the disodium salt per mL blood, complexes with and removes calcium, Ca ", from the blood. Oxalate, citrate, and fluoride ions form insoluble salts with Ca " and chelate calcium from the blood. Salts containing these anticoagulants include lithium oxalate [553-91-3] 1 mg/mL blood sodium oxalate [62-76-0]2 mg/mL blood ... 

Tris(hydroxymethyl)methylamine (TRIS), sodium chloride, sodium citrate, ethylenediamine tetraacetic acid disodium salt (EDTA), lithium chloride, Tween 20, streptavidin 10 nm colloidal gold labelled, hydrochloric acid (37%), nitric acid, streptavidin-coated paramagnetic beads (MB) with a diameter of 2.8 pm, Dynabeads M-280 Streptavidin (Dynal Biotech, Oslo, Norway) biotinylated probe oligonucleotides which sequences are shown in Table 53.1. 

The ZEALEX Process Researchers from KRI have shown that the zirconium salt of dibutyl phosphoric acid (ZS-HDBP) was soluble in Isopar-L in the presence of 30% TBP. This super PUREX solvent, known as ZEALEX, extracts actinides (Np-Am) together with lanthanides and other fission products, such as Ba, Cs, Fe, Mo, and Sr from nitric acid solutions. The extraction yields depend on both the molar ratio between Zr and HDBP in the 30% TBP/Isopar-L mixture and the concentration of HN03 (232). Trivalent transplutonium and lanthanide elements can be stripped together from the loaded ZEALEX solvent by a complexing solution, mixing ammonium carbonate, (NH4)2C03, and ethylenediamine-N.N.N. N -tetraacetic acid (EDTA). An optimized version of the process should allow the separation of... 

EDTA is ethylenediamine tetraacetic acid, an important compiexing agent for metals. This is the salt formed with just two equivalents of ammonia. 

Hydrated lanthanide salts may also be obtained by the addition of an excess of lanthanide oxide to a concentrated acid solution, heating at 80°C until the pH is between 5 and 6. The residual oxide is removed by filtration, and the filtrate is subjected to rotary evaporation. This procedure may lead to the presence of oxo and hydroxy species in solution. At present hydrated lanthanide salts of 99.9% purity are available commercially. Salts of the highest purity are generally used in spectroscopic and magnetic studies. The purity of lanthanide salts can be determined by complexometric titration with ethylenediamine tetraacetic acid [1]. 

As a means of decreasing side reactions in the dehydrogenation of tertiary amines with mercuric acetate, Knabe studied the oxidation of alkaloids of the type of papaverine (1) in the presence of an equivalent amount of the sequestering agent ethylenediamine tetraacetic acid (EDTA) as the disodium salt. The products were the papaverinium salt (2) and the dihydro salt (3) in the yields noted- In the absence of the complexing agent, papaverine is cleaved at the methylene bridge. 

This bond strength is considerably higher than any value for the adhesion to smooth dentin surfaces which has been previously reported. The bond strength is slightly decreased when more dilute citric acid solutions are used. Other pretreatments yielding tensile adhesion values above 10 MPa include solutions of 1% alcoholic (1 2) citraconic anhydride, 1% alcoholic tetrahydrofuran -2,3,4,5-tetracarboxylic acid, and 1% aqueous ethylenediamine-tetraacetic acid tetrasodium salt. 

Salts of polyacetic acids, e.g., ethylenediamine tetraacetic acid (EDTA) and nitrilotriacetic acid (NTA), have long been known to be very effective chelating agents [95], The chelating ability of NTA has been found to be comparable to that... 

Chelation with di- and trivalent metal ions showed even more drastic permeability changes. The experiment was performed by alternating addition of and ETA (ethylenediamine-tetraacetic acid disodium salt), an effective polydentate ligand for Cu. The result is shown in Fig. 25. It is seen that the alternating addition of Cu ... 

Vanadium(V) oxide is amphoteric, dissolving in alkali to give salts of tetrahedral VO " anion, and in acid to give V02. The latter cation is almost certainly cis-[V02(H20)4]+, as in [V02(ox)2]3- and [V02(edta)]3 (ox = oxalate dianion edta = ethylenediamine tetraacetate tetraanion). All dioxo complexes of d° metals have cis configurations, an arrangement that maximizes dji-pjt interactions. 

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