Ratios of first-derivative maxima and compensated derivative absorption curves
1986; Royal Society of Chemistry; Volume: 111; Issue: 7 Linguagem: Inglês
10.1039/an9861100777
ISSN1364-5528
AutoresAbdel-Aziz M. Wahbi, Mohammad A. Abounassif, Hussein M. G. Al-Kahtani,
Tópico(s)Analytical Chemistry and Chromatography
ResumoGeneral 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, |D11–D12|/D11 and D1(corr.)1/|D11–D12| 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.
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