The appararent equilibrium constants of 1:2 complexes are determined by general absorbance - extinction concentration scheme and also by the method of Turner and Anderson at 31°C ± 1°C and at constant ionic strength (0.0075 M) by spectrophotometric technique.        
          

Kinetics and mechanism of oxidation of mixture of oxalic acid+malic acid by chromic acid in presence of hydrochloric acid has been investigated. The observed order in mixture of oxalic acid+malic acid is two, while order with respect to Cr (VI) is one. Rate of reaction is definitely altered in presence of hydrochloric acid hence reaction is catalysed. The rate however does not depend on the hydrogen ion concentration only. Thus acid effect is not due to specific acid catalysis, it seems to be due to general acid catalysis. The salt effect has been studied for the reaction. Effect of manganous sulphate has also been observed. Different parameters have also been calculated, like, temperature coefficient, dielectric constant, catalytic constant, activation energy etc. The resultant compound obtained was identified as formic acid by specific qualitative test and carbondioxide was tested as  usual.            

Complexation of therapeutic compounds with metals present in human body in trace amount may influence their nature, properties and pharmacokinetics. Electrochemical studies on complexes of cobalt with antihypertensive drug, Atenolol [RS, 4-{2-hydroxy-3-isopropylaminopropoxy}phenylacetamide] have been carried out at dropping mercury electrode. Direct current polarographic technique has been employed to study the process. It is found that reduction of Co(II) at d.m.e was irreversible in aqueous medium. Succesive addition of drug shifts half wave potential of cobalt, towards more negative direction. As the system is found to be irreversible and diffusion controlled hence kinetic parameters (K0fh, an) have been calculated using Gaur-Bhargav as well as Meites-Israel method at different temperatures. Results obtained by these methods are in good agreement with each other.           

Nitrophenol derivatives are known for their harmful insecticidal properties. It is mainly used to control plant pests and diseases. Infected rice plant by rice weevil sitophylus oryzae were taken as sample and effect of various nitrophenol derivatives on soil in different concentration were observed. After insecticidal activity sample were tested and it has been found that in case of water insoluble insecticides, it remains on the surface of sample and affects the user. On the other hand water soluble insecticides don't affect directly sample but insecticide containing water affect useful micro organisms present in soil. It increases soil degradation.         

Forty one (41) ground water samples collected from different areas of Khaniyadhana block (shivpuri,M.P.) were analysed for fluoride .The maximum concentration of fluoride has been observed as 6.71 mg/L in the sample from Mamroni. The high concentration of fluoride is of serious concern, as it causes health problem to the local population.              

The present study deals with the investigation of ground water quality of sample collected from different areas from Ater (Bhind, M.P.). Seven sampling point were selected on the basis of their importance. Some parameters are within the permissible limits as prescribed by ISI and W.H.O. While other are beyond the Iimits.   
 

Physico-chemical analysis of Hand pumps& bore wells drinking water has been done in winter season. Ten sampling points were selected on the basis of their importance. The water analysis was carried out for the parameters namely pH, Total alkality, total hardness, Mg2+, Ca2+, Na+, K+ Cl–,  E.C., T.D.S.