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Enhancement of precision and accuracy in derivative spectrophotometry of highly absorbing samples

Isabel Dol, Mois�s Knochen, Carmen Altesor

Open publisher page 11 citations

Abstract

The extension of relative absorptiometric methods to derivative spectrophotometry is proposed as a way of improving precision and accuracy for extremely high absorbance values. The concept was developed by applying the transmittance-ratio method to second-derivative measurements of two model systems where the total absorbance is kept very high, leading to a significant enhancement of precision and accuracy. The variation of the signal to noise ratio and of the total error as a function of absolute and relative absorbance was studied. Some of the factors affecting the analytical behaviour of this method are discussed.

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What this paper is about

The extension of relative absorptiometric methods to derivative spectrophotometry is proposed as a way of improving precision and accuracy for extremely high absorbance values. The concept was developed by applying the transmittance-ratio method to second-derivative measurements of two model systems where the total absorbance is kept very high, leading to a significant enhancement of precision and accuracy. The variation of the signal to noise ratio and of the total error as a function of absolute and relative absorbance was studied. Some of the factors affecting the analytical behaviour of this method are discussed.

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OpenAlex reports 11 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

The extension of relative absorptiometric methods to derivative spectrophotometry is proposed as a way of improving precision and accuracy for extremely high absorbance values. The concept was developed by applying the transmittance-ratio method to second-derivative measurements of two model systems where the total absorbance is kept very high, leading to a significant enhancement of precision and accuracy. The variation of the signal to noise ratio and of the total error as a function of absolute and relative absorbance was studied. Some of the factors affecting the analytical behaviour of this method are discussed.

Key concepts: Absorbance, Spectrophotometry, Accuracy and precision, Derivative (finance), Analytical Chemistry (journal), Chemistry, Transmittance, Approximation error

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