Spectrophotometric Simultaneous Determination of Zinc(II), Manganese(II) and Iron(II) in Pharmaceutical Preparations Using OSC-PLS

The purpose of this paper is to develop a fast and sensitive spectrophotometric method for the simultaneous determination of zinc(II), manganese(II) and iron(II) in pharmaceutical preparations. The method presented in this work is based on the well-known reaction of these ions with 4-(pyridylazo)resorcinol (PAR)1. The application of quantitative chemometric methods, particularly PLS to multivariate chemical data is becoming more widespread owing to the availability of digitized spectroscop…     

Cation thin-layer chromatography in mixed organic solvents containing s-butylamine: Separation of Zn(II) from Cd(II) and Cu(II)

Summary A TLC method has been developed for the separation of Zn(II) from Cd(II) and Cu(II) on silica gel alyers with mixed organic solvents containing s-butylamine. The separation of Zn(II) from Cd(II) in the presence of certain anions and at various pH values of sample solution was examined. A mixture containign s-butylamine, acetone and formic acid in 262 was found to be the best solvent.     

Unbounded symmetrysets

Unbounded symmetrysets R Z_pⁿ are introduced which, in the presence of a Jacobi condition, are classified and can be written as R = Z_p^n₁ + + Z_pⁿ_k (inner direct sum), where n_i n for all i = 1, , k. The properties of these unbounded symmetrysets are easily verified for the set R of roots of Witt Lie algebras. This paper is a step in the direction of classifying simple Lie algebras of characteristic, p, by studying their rootsystems.     

In search of photon’s elementary axial magnetostatic field

 Experimental investigations of the photon’s B ⁽³⁾-field (third longitudinal polarization) are reported. The existence of an “axial magnetostatic field of photon” has been predicted in B _π or B ⁽³⁾-theory as the fundamental property of the circularly polarized light, and reported in numerous papers and monographs. High-sensitivity detection has been employed in photomagnetic induction, Faraday, and inverse Faraday effects (IFE) originating from such a field. The results of all three experiments clearly disprove the claims of B _π-theory. Putting together these results and theoretical calculations in perspective, it is concluded that such fields are non-existent. Received: 25 January 1996 / Revised version: 24 May 1996