Which link is easy to go wrong when determining the acid value of fishmeal?

When the acid price of fishmeal exceeds the scope stipulated in the contract, which link is easy to cause problems during the determination? This post was finally edited by dustrunner at 13:39 on 2009-11-30. It can be crushed and done in parallel. If it meets the requirements of the detection method, there is something wrong with the quality of fishmeal itself! -- Fish meal is dark in color and should be filtered in determination, and the amount should be appropriate. I think it is appropriate to have 2-4 grams, too much end color is not easy to observe, and too little is not representative. In addition, the concentration of KOH ethanol standard solution should be often corrected because ethanol is volatile.