Conclusions
This experiment utilized external standards and high-performance liquid chromatogrpahy to determine the amount of citric acid in various orange juices, orange flavored drinks, and a navel orange. The navel orange had the highest citric acid concentration, followed by the 100% orange juices, the orange flavored juices, and then the 100% mixed fruit juice. Although the total citric acid concentration was determined, differentiating between natural and added manufactured citric acid was not possible. Phase collapse was not an issue until the third analysis of the juices at which point the experiment was stopped to rewet the column. To determine multiple organic acids simultaneously it is