Study on Decreasing Effect of Ascorbic Acid on Algae Killing Ability of UV

Abstract

In this paper, the Nostoc 106 has been taken as the test algae and the antioxidant effect of ascorbic acid in the process of killing cyanobacteria by UV-C radiation has been discussed through employing the ascorbic acid as the experimental subject. At the same time, the resistance effect of ascorbic acid on UV-C in different concentrations has been also analyzed. Under normal conditions, UV-C has a strong oxidation killing ability for Nostoc 106. When the reaction temperature is 25 degrees C, the ultraviolet light intensity is 0.5mW/cm(2) and pH is 6.8. Under the condition of 30min reaction time, the killing rate of test algae can reach 77% after 5 days. However, with the addition of ascorbic acid, the killing rate of Nostoc 106 can reach 35%. During the experiment, the ascorbic acid has a decreased effect on UV killing power.