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Bring an additive in the second flask – standard solution of copper in such quantity that copper peak height on a polyarogramma doubled in comparison with the initial. The additive should be brought in small volume (no more than 1 cm ³) to prevent change of concentration of background electrolyte and cindery elements. Further arrive as with solution without additive.

Value of a mean square deviation of a casual component of an error of measurements of a mass fraction of arsenic of the same test in different laboratories at the influencing factors allowed by a technique makes 0,18X.