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A modification of the standard additions method called the "H-point standard additions method" IS proposed in order to obtain an unbiased analyte concentration when both analyte and interferents are present in a sample It also permits the determination of an interferent known to be present The method uses the analytical signal data at two selected wavelengths, giving two straight lines that have a common point with coordinates H {-& AH), where -G IS the unknown analyte concentration and 4 the analytical signal due to an intetferent Examples of the application of the proposed method are given Keywords H-point, standard additions method, analyte and interferent concentration, bias error Paper A71501

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