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Automatic Titration of Fecal Indicator Chromium and Micro-Kjeldahl Nitrogen

Department of Dairy Science, Auburn University, Auburn, Alabama

ABSTRACT

Many problems associated with time-consuming analytical titration procedures can be circumvented with automatic derivative titrimetry. The apparatus developed by Malmstadt and Hadjiioannou (3) can reduce operator error and increase speed and precision.¹ The two methods outlined in this report are proposed for the routine analysis for chromic oxide in feces and total nitrogen in feed and feces with this apparatus. However, they may be altered for either manual or other instrumental devices.

EXPERIMENTAL PROCEDURES

Critical reagents and apparatus for optimum titration conditions are listed in Table 1. I. Procedure for the determination of chromic oxide in feces: a. Sample preparation. Dried, ground, 1-g fecal samples are wet-ashed according to the procedure of Kimura and Miller (2), modified by the use of special reflux condensers following the addition of HClO₄. Condensers prevent the loss of volatilized HClO₄ and subsequent accumulation of condensate on the inside walls of the fume hood.

When the digestion flasks have cooled, transfer residues quantitatively to the titration beakers, add 10 ml of reductant solution, and dilute solutions to approximately 160 ml with distilled water.