A radiochemical method for the determination of fluoride has been developed. The effect of fluoride on the extraction of the Fe/III/ thiocyanate complex into TBP in nitrobenzene has been utilized. Microgram quantities of F– have been determined. Effect of diverse ions has also been reported. The method is applied for the determination of F– in a natural sample of apetite.
Isotope exchange behaviour of bis/diethyl dithiocarbamate/ copper/II/ complex has been studied at 30 °C and 40 °C varying the concentration of the complex and metal ion. Results indicate that the complex is labile in chloroform dimethyl sulphoxide medium. Increase in concentration has significant effect on the rate of the reaction. Similarly the increase in temperature increased the rate of the reaction.
Authors:T. Balaji, R. Acharya, A. Nair, A. Reddy, K. Rao, G. Naidu, and S. Manohar
Elemental concentrations of a few medicinal leaves are determined by instrumental neutron activation analysis using the single comparator (k0) method. Data obtained for neem leaves, collected from two different places, have been used to see the effect of soil condition. The applicability of the method particularly for the simultaneous determination of Ca, Mg, V and Al in biological matrices has been evaluated in terms of the detection limit, precision and accuracy. The method was validated by analysing the NIST Standard Reference Material (SRM-1571) and it was found that the elemental concentrations measured in SRM-1571 are within ±10% of the reported values.