Kinetics and mechanism of hallogenative oligomerization of mesityl oxide by Chloramin-T. Evidence for a novel pathway in aqueous sulphuric acid

The kinetics of the reaction between mesityl oxide and chloramine-T (CAT) in aqueous sulphuric acid in the presence of KHSO4 has been studied. The results indicate a radical chain mechanism to be operative which is quite novel in CAT kinetics

One-dimensional analysis of salinity intrusion in estuaries

This report describes a mathematical model that was developed to predict salinity intrusion in estuaries as it is affected by control and abstraction of fresh water. The need for such a model, particularly for estuaries in tropical areas with large variations in fresh water flow, capable of giving satisfactory predictions of salinity movement from limited field data is brought out. The difficulties in using existing mathematical models for such purposes are discussed. The model outlined in this report overcomes these difficulties by relying on an approximate analytical solution of the unsteady one dimensional high water slack mass balance equation. The model relies on estimating the value of the longitudinal dispersion coefficient from field data obtained within a period of about six months. The predictions made for a continuous period of over two years for the Gambia estuary are shown to agree well with observations. The predictions made by the model for salinity movement under different fresh water abstraction and regulation patterns are also presented.O