"Feed Industry Standards," 2002 edition (volume I) GB/T 6434-1994 Determination of crude fiber content in the arbitration law provisions: sour boiling after filtration ", with boiling distilled water to neutrality; and then filtered after cooking" It is first washed with 25 ml sulfuric acid solution and then washed with boiling distilled water until neutral." In the crude fiber tester, both filtrations were washed with boiling distilled water. However, it is inconvenient to perform the operation at an excessively high temperature. If you change to room temperature distilled water, does it affect the measurement results? Can I use a room temperature test solution to wash? For this purpose, the following comparative experiments were designed: Washing with distilled water at room temperature and washing with boiling distilled water as specified in the national standard method, and determining the crude fiber content in feed ingredients and feed products, respectively, to provide certain theoretical data for convenient operation.
According to the GB/T6434-1994 arbitration law, feed samples were weighed about 1.5g (W, accurate to 0.0002g), respectively, without loss of high-grade beaker (boiler), adding 0.128mol/l boiling sulfuric acid solution 200 ml and 1 drop of n-octanol boil in 2 min and remain micro-boiling for 30 min. During this process, the concentration of sulfuric acid remains unchanged. The results of the two groups A and B were similar. The absolute value difference between the two groups was 0-0.3%, which was less than the requirement of 0.4%. The average difference was 0.1%; the differences between the indicators in the groups were not significant, indicating the washing temperature in the determination process The effect of the results is not great, and it can be washed with room temperature distilled water.
Experiments show that the crude fiber analyzer can be washed with room temperature distilled water to determine the content of crude fiber in the feed, which facilitates the operation and simplifies the procedure. Although GB/T6434-1994 has been replaced with GB/T6434-2006 for the 2008 edition of the Feed Industry Standard (Part 2), no changes have been made to the temperature of the washing reagents. Therefore, the comparison experiment still has a discussion on the new standard. value.
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