Seven laboratories participated in a collaborative study to extend the applicability of the AOAC generic combustion method for determination of crude protein in animal feed (990.03) to include determination in cereal grains and oilseeds. In the study, method 990.03 was compared with the AOAC mercury catalyst Kjeldahl method for determination of protein in grains (979.09) and crude protein in animal feed (954.01). The study also evaluated the effect on the results of fineness of grind. For determination of crude protein in grains and oilseeds by the combustion method, standard deviations for repeatability and reproducibility ranged from 0.10 to 0.37 and from 0.25 to 0.54, respectively, and relative standard deviations for repeatability and reproducibility ranged from 0.77 to 2.57% and from 1.24 to 3.15%, respectively. The combustion method was adopted first action by AOAC International for determination of crude protein in cereal grains and oilseeds containing 0.2- 20% nitrogen.

The objective of this study was to compare the flooding characteristics of Fluorothene Raschig rings at low liquid rates with the existing literature data on carbon rings.Visual ^observations of flooding in the air-water system were correlated with pressure drop using a 3-in. i.d. glass' column having an 18-in. long Fluorothene Raschig ring packed section. A comparison of extrapolated literature data with these experimental data indicates the gas flow rates required to flood Fluorothene packing are slightly higher than for carbon packing. At a liquid flow rate of 537 lbs/hr-ft 2 , Fluorothene rings flooded at a gas velocity of 8^2 lbs/hr-ft 2 whereas carbon rings are reported to flood at a gas velocity of approximately 755 lbs/hr-ft. NOTICEThis document contains information of a preliminary nature and was prepared primarily for internal use at the Oak Ridge National Laboratory. It is subject to revision or correction and therefore does not represent a final report. The information is not to be'abstracted, reprinted or otherwise given public dissemination without the approval of the ORNL patent branch, "Legal and Information Control Department.