Note on Polarographic Determination of Small Amounts of Lead

The composition and characteristics of a new supporting electrolyte for the polarographic determination of small amounts of lead are described. The electrolyte is a 0.5 N aqueous solution of succinic acid containing 0.008 % gelatine. The analysis of the results obtained with this electrolyte shows that it can be used even when concentrations of the order of 10-6 M Pb (or 1 ug Pb/ml.) are involved. It has been shown that the electrode reaction consists in a reversible cathodic reduction of bivalent lead ions to the uncharged metallic lead

Treatment of Polarographic Data by the Least-Squares Method I. Estimation of the Half-wave Potential

The application of the half-wave potential in polarographic investigations is reviewed. In view of the fact that the methods currently used for computation of the half-wave potential do not give very reliable values and do not allow the estimation of experimental errors, an attempt is made to apply the least-squares method to the computation of the half-wave potential from the current-voltage data

Regge Behaviour from an Environmentally Friendly Renormalization Group

The asymptotic behaviour of cubic field theories is investigated in the Regge limit using the techniques of environmentally friendly renormalization, environmentally friendly in the present context meaning asymmetric in its momentum dependence. In particular we consider the crossover between large and small energies at fixed momentum transfer for a model scalar theory of the type phi^2 psi. The asymptotic forms of the crossover scaling functions are exhibited for all two particle scattering processes in this channel to one loop in a renormalization group improved perturbation theory.Comment: 9 pages text, one figure, LaTeX, uses psfig.sty. Revised version submitted to Phys. Lett. B., besides minor changes a figure to illustrate the conventions and a discussion of the full crossover function have been adde

On the Stability of Metal Complexes with Racemic Ligands

Although the amino-acid chelates have b een ext ensively inve·stigated on account of their stability, mo.st of the work was done without regard to the optical properties of such ligands1. The same also applies t o optically active Hgainds other than ami1no-ac1ds. Before trying to elucidate the experimental evidence this communication was originated with the question: can useful evaluation of stability data be made in systems consisting of a metal \u27ion and racemic or enantiomeric forms of an optically active ligand

Polarographic Determination of Uranium in Blood

A polarograiphic method has been developed for the determination of uranium in blood. Blood is destroyed with nitric acid and hydrogen peroxide and the uranium extracted with tetra hydropyrane in a micro liquid-liquid extractor. The polarographic determination is performed in a supporting electrolyte containing 0.16% salicylic acid, 0.4% v/v sulphuric acid, and 0.009 % thymol. The method is applicable to the determination of uranium in blood in amounts ranging from 5 μg upwards

Polarographic Determination of Uranium in Blood

A polarograiphic method has been developed for the determination of uranium in blood. Blood is destroyed with nitric acid and hydrogen peroxide and the uranium extracted with tetra hydropyrane in a micro liquid-liquid extractor. The polarographic determination is performed in a supporting electrolyte containing 0.16% salicylic acid, 0.4% v/v sulphuric acid, and 0.009 % thymol. The method is applicable to the determination of uranium in blood in amounts ranging from 5 μg upwards

Chelation of Some Bivalent Metal Ions with Alanine and Phenylalanine

The interaction of D, L, or racemic forms of alanine and phenylalanine with some bipositive metal ions (Cd, Cu, Ni, Pb and Zn) has been studied. The proton dissociation constants of the ligands and stability constants of the complex species formed have been determined. No stereospecific effects have been observed, i.e. no significant differences h ave been found between the stability constants of the corresponding MD or ML, and MD 2, ML 2 or MLD complexes in aqueous solution at 20°C and an ionic strength of 0.37 (NaN03). The MLD complex is considered as being the predominant species in t he system consisting of ·metal ions and a racemic ligand