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Cyanides, whether organic or inorganic, are highly toxic to all forms of life, i.e., animals and plants alike. This necessitates its detection and determination even when present in trace amounts. Various optical, electrometric, radiochemical and chromatographic methods so far reported for this purpose have been reviewed. An exhaustive bibliography of 154 references is given.

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The complexation behaviour of 2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one thiosemicarbazone (DMPPOT) has been studied palladium(I1 manganese(I1 and oxovanad on the basis Metal complexes of chromium(III), iron(III), , cobalt(II), copper(II), nickel(II), , zinc(II), cadmium(II), mercuryfII), lead(I1) um(1V) have been synthesised and characterised of elemental analysis, molecular weights, magnetic moments, infrared and electronic spectral studies, and conductance measurements. The complexes have been screened for their possible antimicrobial activity.

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