Crude protein in crude protein can not generally be absorbed and used, so there is a limit to the crude fiber content of feed, but the method for determining crude fiber content in feed is not perfect, and the results of the determination are often biased. Select a more advantageous instrument for the determination. We recommend the use of a crude fiber analyzer for the measurement study.
Weigh 1 to 2g sample accurate to 0.00029, defatted with ether (with less than 1% fat can not degrease), into the digester, add the concentration of 0.128mol/L and the boiling point of sulfuric acid solution 200ml and 1 drop is Xin Alcohol, immediately heated to make it boil in Zmin, and continuous micro-boiler 30 persons lmin, pay attention to maintaining the same concentration of sulfuric acid, the sample should not leave the solution stained on the bottle wall (can add boiling distilled water). It is then filtered and washed with boiling distilled water until acid-free.
Insoluble material was taken out and placed in the original container, and 200 ml of an accurately boiled sodium hydroxide solution was added. The same accurate boiling of 30min, immediately on the ashes of asbestos Guchen addiction filter, first with sulfuric acid solution 25ml, and then washed with boiling distilled water to neutral.
Compared with the sour-cooking stage, the alkali cooking stage also has the same result that the sample is boiled for more than 3omin, resulting in low accuracy, which is due to the fact that the sample becomes thick after caustic digestion. It was found in the determination that when the cook time was extended to 15 minutes, the average relative deviation of 10 measurements was 9.0%; when the cooking time was extended to 30 minutes, the average relative deviation of 10 measurements was 16.6%; when the cooking time was up to 1 hour When the average of 10 measurements is 27.6, the error is written. Therefore, the deviation of the measurement results caused by the prolonged causticization time can not be ignored.
When the cooking time is 30 ± 1 min, 15 ml of a sulfuric acid solution of 16 mol/L (corresponding to 150 ml of a standard sulfuric acid solution of 0.157 mol/L) can be added immediately, so that the liquid sample in the boiler is basically maintained in a neutral state, and then immediately For asbestos-blasted Gushizhuangli filter, it is first washed with sulfuric acid solution (25ml) and then washed with boiling distilled water to neutrality. According to the above suggested practice, the use of crude fiber analyzers to improve the detection of crude fibers can improve the detection accuracy.
Weigh 1 to 2g sample accurate to 0.00029, defatted with ether (with less than 1% fat can not degrease), into the digester, add the concentration of 0.128mol/L and the boiling point of sulfuric acid solution 200ml and 1 drop is Xin Alcohol, immediately heated to make it boil in Zmin, and continuous micro-boiler 30 persons lmin, pay attention to maintaining the same concentration of sulfuric acid, the sample should not leave the solution stained on the bottle wall (can add boiling distilled water). It is then filtered and washed with boiling distilled water until acid-free.
Insoluble material was taken out and placed in the original container, and 200 ml of an accurately boiled sodium hydroxide solution was added. The same accurate boiling of 30min, immediately on the ashes of asbestos Guchen addiction filter, first with sulfuric acid solution 25ml, and then washed with boiling distilled water to neutral.
Compared with the sour-cooking stage, the alkali cooking stage also has the same result that the sample is boiled for more than 3omin, resulting in low accuracy, which is due to the fact that the sample becomes thick after caustic digestion. It was found in the determination that when the cook time was extended to 15 minutes, the average relative deviation of 10 measurements was 9.0%; when the cooking time was extended to 30 minutes, the average relative deviation of 10 measurements was 16.6%; when the cooking time was up to 1 hour When the average of 10 measurements is 27.6, the error is written. Therefore, the deviation of the measurement results caused by the prolonged causticization time can not be ignored.
When the cooking time is 30 ± 1 min, 15 ml of a sulfuric acid solution of 16 mol/L (corresponding to 150 ml of a standard sulfuric acid solution of 0.157 mol/L) can be added immediately, so that the liquid sample in the boiler is basically maintained in a neutral state, and then immediately For asbestos-blasted Gushizhuangli filter, it is first washed with sulfuric acid solution (25ml) and then washed with boiling distilled water to neutrality. According to the above suggested practice, the use of crude fiber analyzers to improve the detection of crude fibers can improve the detection accuracy.
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