Issue 7, 1986

Ratios of first-derivative maxima and compensated derivative absorption curves

Abstract

General procedures are outlined for the detection of the presence of interferences during spectrophotometric analysis using first-derivative absorption spectra. These involve (i) ratios of first-derivative maxima, which are independent of concentration, and (ii) the compensated derivative curves. Thus, selecting two suitable maxima at λ1 and λ2, D11/D12, |D11D12|/D11 and D1(corr.)1/|D11D12| are used to reveal the shape of the interference curve and the possibility of eliminating its effect. These ratios are highly reproducible with coefficients of variation of less than 1%. The methods are illustrated by the determination of phenol in a pharmaceutical preparation. The results obtained were in good agreement with those of the official bromimetric method.

Article information

Article type
Paper

Analyst, 1986,111, 777-780

Ratios of first-derivative maxima and compensated derivative absorption curves

A. M. Wahbi, M. A. Abounassif and H. M. G. Al-Kahtani, Analyst, 1986, 111, 777 DOI: 10.1039/AN9861100777

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