In the determination of the acid value of fishmeal, which step is prone to problems?
When determining the acid value of fishmeal, which step is prone to problems?
When the acid value of fishmeal exceeds the range specified in the contract, which step in the determination is prone to problems?
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This post was last edited by dustrunner on 2009-11-30 13:39
You can grind it and then run parallel samples; if it meets the requirements of the test method, then the quality of the fishmeal itself is the problem!
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Fishmeal is rather dark in color, so it should be filtered during determination, and the amount weighed should be appropriate. I think 2-4 grams is suitable; too much makes the endpoint color hard to observe, too little is not representative. In addition, the concentration of the KOH ethanol standard solution should be calibrated frequently, because ethanol is volatile.
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This post was last edited by dustrunner on 2009-11-30 13:39
You can grind it and then run parallel samples; if it meets the requirements of the test method, then the quality of the fishmeal itself is the problem!
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Fishmeal is rather dark in color, so it should be filtered during determination, and the amount weighed should be appropriate. I think 2-4 grams is suitable; too much makes the endpoint color hard to observe, too little is not representative. In addition, the concentration of the KOH ethanol standard solution should be calibrated frequently, because ethanol is volatile.