Application of orthogonal functions to spectrophotometric analysis: The Δpj method

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Abstract
A general method is outlined for the use of orthogonal functions to eliminate interference in differential spectrophotometric analysis. The method is particularly useful when (i) the optimum conditions of the ΔA method are not fulfilled and (ii) the irrelevant absorption is linearly dependent upon the spectrum of the pure compound or its shape is completely unknown. The results obtained for the determination of clemizole in tablets are encouraging and suggest that the method warrants a careful study over a wide field of applications.

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