Evaluation of acid digestion techniques to estimate chromium contents in cattle feces

• Main Authors: Gabriel Cipriano Rocha, Malber Nathan Nobre Palma, Edenio Detmann, Sebastião de Campos Valadares Filho
• Format: Article
• Language: English
• Published: Embrapa Informação Tecnológica 2015-01-01
• Series: Pesquisa Agropecuária Brasileira
• Subjects: óxido de cromo; recuperação de cromo; indicadores.
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000100092&lng=en&tlng=en

The objective of this work was to evaluate the accuracy of digestion techniques using nitric and perchloric acid at the ratios of 2:1, 3:1, and 4:1 v v-1, in one- or two-step digestion, to estimate chromium contents in cattle feces, using sodium molybdate as a catalyst. Fecal standards containing known chromium contents (0, 2, 4, 6, 8, and 10 g kg-1) were produced from feces of five animals. The chromium content in cattle feces is accurately estimated using digestion techniques based on nitric and perchloric acids, at a 3:1 v v-1 ratio, in one-step digestion, with sodium molybdate as a catalyst.