Reproducibility of extinctions measured on the slopes of absorption curves

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Abstract
Errors in setting the wavelength scale of an ultra‐violet spectrophotometer cause an increase in the variance of extinctions measured on the slope of an absorption curve. For a given instrument and operator, the coefficient of variation of extinctions measured on a steep slope was ten times the normal value for zero slope. A method is described for obtaining reasonably precise estimates of (E/), where “S” refers to the displacement of the wavelength scale. The coefficient of variation bears a linear relationship to (E), which is relevant to the choice of wavelengths for Vierordt's method.
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  • Colombo Plan Authority

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