Direct Atomic Absorption Spectrometric Determination of Selenium in Biological Fluids by a Graphite Filter Furnace Atomizer with Carbon Thread

• Published in: Analytical letters Vol. 51; no. 15; pp. 2390 - 2400
• Main Authors: Zacharia, Alexander, Gucer, Şeref, Arabadji, Michael, Chebotarev, Alexander
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 13.10.2018; Taylor & Francis Ltd
• Subjects: Atomic absorption analysis; Atomic beam spectroscopy; Atomizing; Biological fluids; electrothermal atomic absorption spectroscopy; Graphite; graphite filter tube-in-tube atomizer; Heating furnaces; Organic chemistry; Palladium; Saliva; Selenium; Spectrometry; Urine
• ISSN: 0003-2719; 1532-236X
• DOI: 10.1080/00032719.2018.1424887

A rapid and simple method was developed for the determination of selenium in biological fluids by direct electrothermal atomic absorption spectroscopy. The operation parameters of a commercial longitude heating furnace combined with a graphite filter furnace, graphite thread (tube-in-tube atomization system), and a Pd-Mg chemical modifier were proposed, and the corresponding analytical characteristics for the determination of Se at concentrations greater than or equal to 0.0025 mg/kg in blood, urine, saliva, and breast milk samples were established. Recovery values of Se with the proposed method varied within 93 to 107% for these matrices. Relative standard deviations for the analysis of certified material were also compatible; values of 5 and 7% were achieved for blood serum and urine, respectively. The relative standard deviation obtained by the proposed method did not exceed 8%, and the total time for Se determination was 5 to 7 min. The novelty of this technique is that it offers an effective tool for removing the interferences from 10 to 20 g/L organic and 1.0 to 1.5 g/L mineral components in the materials and for significantly reducing the background absorption of light caused by their presence.