Density, conductivity, and viscosity data are reported in the 25°–50°C range for the neat liquid Et3NHCuCl2 and for solutions containing normalCuCl and CuCl2 . The Walden product of the room temperature fused salt is not much lower than that of a molten alkali metal halide. A relation proposed by Frenkel, μnormalΛfalse(Eμ≠/EnormalΛ≠false)=normalconstant , is followed closely by triethylammonium dichlorocuprate (I) and by solutions containing normalCuCl and CuCl2 . The normalCu/Et3NHCuCl2 electrode was found usable as a reference electrode. A solution of CuCl2 in Et3NHCuCl2 has an absorption maximum at 402 nm false(∈=2.02×103 normalliters mole−1 cm−1false) . Spectrophotometric studies in an optically transparent gold minigrid electrode cell are reported. Potentiometric data from this and from a normalCu/Et3NHCuCl2/Et3NHCuCl2 , CuCl2false(Mfalse)/normalPt cell show approximate Nernstian behavior. Overpotential‐current studies permit calculation of the exchange current density at each of the above electrode interfaces. Anodic and cathodic current‐voltage plots obtained with a platinum working electrode in neat Et3NHCuCl2 in the region of the Cu(I)/Cu(II) redox couple have a remarkable appearance. They resemble a conventional cyclic voltammogram of a dilute solution even though the electrode reaction involves a constituent ion of the solvent itself. This is due to formation of a viscous film of the anodic product CuCl2 on the electrode surface. Practical development of galvanic cells based on Et3NHCuCl2 electrolytes is limited by their high internal resistance.
An atomic absorption Spectrophotometric (AAS) method for determining chelated iron in iron chelate concentrates was collaboratively studied by 13 laboratories. Nonchelated iron was selectively precipitated as ferric hydroxide from an aqueous solution of the sample by adjusting to pH 8.5 with sodium hydroxide. A filtered portion of the sample solution was diluted with 0.5N HC1, and the iron was determined by AAS using standards containing disodium EDTA. Six pairs of iron chelate materials (12 samples) were analyzed and the average coefficients of variation were iron EDTA 3.52%, iron HEDTA 4.16%, iron DTPA 3.55%, iron EDDHA 3.52%, iron citrate 2.86%, and iron DPS 8.47%. The method has been adopted official first action.
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