English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Complexation of Co(II), Ni(II) and Cu(II) with 2, 2– bipyridine (bpy) have been studied spectrophotometrically at absorption maxima for Co(bpy), Ni(bpy) and Cu(bpy), of 400, 400 and 680nm respectively. The complexations were carried out at temperatures 30°C, 40°C, 50°C and 60°C at the wavelengths of the respective complexes. The stoichiometry of the complexes were determined using Job’s continuous variation method and the value was found to be 1:2 metal to ligand ratio. Stability constants (K) values were calculated using the continuous variation method and found to be in the order 3.51 x 10 3 , 3.30 x 10 3 and 2.88 x 10 3 respectively for Cu-bpy, Ni-bpy and Co-bpy. The complexes were found to be stable over the temperature range used as there was slight change in the color intensity and absorbance values. From the thermodynamic parameters ΔG, ΔS and ΔH values, the reactions were all spontaneous and exothermic. Keywords : Cobalt(II), Copper(II), Nickel(II), Spectrophotometric, Stability constant, Thermodynamic parameters

Determination of Some Heavy Metals in Selected Poultry Feeds Available in Kano Metropolis, Nigeria.