[en] A polarographic study of Pr(III) and Nd(III) complexes with ethylenediamine has been carried out at a pH 2.40 +- 0.02. It is observed that the metals as well as their complexes are reversibly reduced at the dme surface. The composition and stability constants of the complexes have been calculated by Lingane method from the observed polarographic data. Both the metals form 1:2 complexes with ethylenediamine. The order of stability constants of the complexes is [Pr(III)-(En)sub(2)]³⁺ less than [Nd(III)-(En)s ub(2)]³⁺. (author)

No abstract available

[en] A rapid method for the trace estimations of Pr(III) and Nd(III) with MTB at the dropping mercury electrode has been developed. Amperometric titrations have been performed at 1.15 V vs S.C.E. in Britton-Robinson buffer pH 5.8 and μ=0.2. The present method is selective, less tedious and more effective even in presence of large number of diverse ions. (author)

[en] Cupferron has been employed as a reagent for the amperometric titrations of La³⁺ and Ce³⁺ in very dilute solution using d.m.e. Hydrochloric acid (pH=2.75) has been used as supporting electrolyte. These titrations revealed cupferron to metal ratio of 1:1. Titrations are not hampered by the presence of a fairly large amount of Li⁺, Na⁺, K⁺, Mg³⁺, Zn³⁺, Al³⁺, Cl^-, Br^-, I^-, NO₃^-, NO₂^-, CH₂COO^-and ClO₄^- ions. Furthermore, micro and ultramicro quantities of La³⁺ and Ce²⁺ have been successfully determined with an error of less than +- 0.70%. (author)

[en] Xylenol orange has been employed successfully as a titrant for the amperometric estimation of Sm³⁺ and Gd³⁺ in very dilute solutions. All the titrations have been performed in Britton-Robinson's buffer at pH 5.5 and at an ionic strength of 0.2. The molar ratio of the titled rare earth ions with xylenol orange is found to be 1:1 respectively. The method has been successfully applicable with an error of less than 0.93 percent and in presence of various diverse ions. (author)

No abstract available

[en] In the present communication the authors have reported the polarographic study of Nd(III) complexes with glycine, iminodiacetic acid and nitrilotriacetic acids. (author)

[en] 4-(2-Pyridylazo) resorcinol has been employed successfully as an amperometric reagent for the precise determination of Pr³⁺ and Nd³⁺. The reagent's sensitivity is high. 0.1409 mg of Pr³⁺ and 0.1442 mg of Nd³⁺ could be detected successfully in 10 ml solution of each ion with an error of less than +- 0.8%. The titrations have been performed at pH 6.1 +- 0.02 and ionic strength of 0.5 M 1:2. Titrations are not hampered by the presence of fairly large amounts of K⁺, Na⁺, NH₄⁺, Mg²⁺, Tl⁺, Ca²⁺, Mo⁶⁺, Cl^-,ClO₄^-, CH₃COO^-, NO₃^- and SO₄^2- ions. Experimental and calculated statistical data support the utility of the method. (author)

[en] Polarographic behaviour and kinetics of electrode reaction of Nd(III) in potassium chloride in presence of 0.01 per cent gelatin between pH 1.9 to 3.0 value has been investigated. It is observed that Nd(III) gives an irreversible polarographic wave in 0.1 to 0.5 mol dm^-3 potassium chloride, which attains a quasi-reversible nature on increasing the supporting electrolyte concentration and finally it becomes almost a reversible reduction wave in 1.0 mol dm^-3 potassium chloride. The reduction wave is of diffusion controlled nature. A shift in the half-wave potential to more negative value is observed with increasing pH of the test solutions. Reversible half-wave potentials have been calculated by Gelling's method. Kinetic parameters of quasi-reversible and irreversible waves have also been evaluated. (author)

[en] A polarographic study of binary complexes of Nd(III) with phthalic acid and anthranilic acid (abbreviated as PhA and AA) has been carried out at a pH 2.4+-0.02. Single well defined reversible three electron reduction waves were obtained for Nd(III) and of its complexes under study. The reduction was found to be diffusion controlled. Ionic strength μ=1.0 was kept constant by potassium chloride. Both the ligands formed 1:2 complex with Nd(III). The stoichiometry of complexes was [Nd(III)-(Ph A)₂]^- and [Nd(III)-(AA)₂]⁺. The stability constants were calculated by the Lingane method and followed the order: [Nd(III)-(Ph A)₂]^-<[Nd(III)(AA)₂]⁺. (author)