The bases used in quantum mechanics, in general, are orthonormal. The relations in orthonormal basis vectors are simpler than those in nonorthogonal basis vectors. Also, the operators that represent different physical quantities are Hermitian and the eigenvectors of these operators belonging to different eigenvalues are orthonormal to each other. But, in many cases, such as sets of screened hydrogenic wavefunctions, nonorthogonal sets of basis vectors occur. It is, therefore, necessary to consider the representation of vectors and operators in nonorthogonal bases. Making use of the set of vectors reciprocal to the given set of nonorthogonal base vectors, the expression for the norms of vectors and for the matrix elements has been found. Also, adjoint and Hermitian matrices in nonorthogonal bases have been worked out using a set of reciprocal basis vectors.

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Wastewater generated from a pesticide industry containing 15 to 20% HCl was neutralised and stored in three solar evaporation ponds (SEP)lined with Flexible Membrane Liner(FML). Characteristics of the pond water showed the presence of high concentration of dissolved solids which were mainly due to salts such as chloride and sulfate of calcium and sodium. High performance liquid chromatographic (HPLC) analysis of pond water did not indicate the presence of sevin. A variation in the chemical composition of the sediment samples was observed from top to bottom layers. The study revealed that the salts and organics were retained mostly in the upper portion of the pond * 303, Block F Majestic Mansions 1 -11 -200, Begampet, HYDERABAD -500016

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