Determination of essential metals in complete diet feed by flow injection and flame atomic absorption spectrometry

• Published in: Microchemical journal Vol. 72; no. 2; pp. 221 - 228
• Main Authors: Vidal, M.T, Pascual-Martı́, M.C, Salvador, A, Llabata, C
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier B.V 01-07-2002; Elsevier
• Subjects: Analytical chemistry; Animal feed; Atomic absorption spectrometry; Biological and medical sciences; Chemistry; Exact sciences and technology; Feed and pet food industries; Flow injection analysis; Food industries; Fundamental and applied biological sciences. Psychology; On-line pre-concentration; Spectrometric and optical methods; Cu; Flow injection analysis; On-line pre-concentration; Ca; Animal feed; Fe; Atomic absorption spectrometry; Chemical analysis; Calcium; Animal feeding; Transition metal; Iron; Alkaline earth metal; Flame spectrometry; Chemical enrichment; Multicomponent analysis; Sample preparation; Quality control; Preconcentration; Copper; Feed; Quantitative analysis; Flow injection
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/S0026-265X(02)00037-1

A prior study of different sample pre-treatments for the determination of metallic elements in complete diet feeds was performed in order to choose the most suitable for these samples. The studied pre-treatment were: acid extraction (lixiviation), wet digestion (on microwave oven) and dry ashing mineralization (calcination). Lixiviation (acid extraction) with hydrochloric acid was selected due to its accuracy, fast and simple pre-treatment procedure. Due of the different levels of concentration of the metallic elements in the samples, the same manifold was used but with small variations. Copper (with on-line pre-concentration by chelating Chelex-100 resin), calcium (with on-line dilution) and iron determination gave suitable accuracy and precision and required a little time for analysis. Five different samples were analyzed by flow injection and the results were contrasted with dry ashing mineralization in batch procedure and with the labeled contents.