, ultrapure water, and a waterless (air) condition) were established. In addition, UVA340 lamp was selected as simulated natural sunlight because it can give a good reproduction of natural sunlight . First, the samples were placed evenly on glass dishes, and the samples were just submerged in the simulated seawater or ultrapure water solution environments using a dropper. Then, the glass dishes were transferred into homemade environmental chamber (60 cm × 30 cm × 30 cm for length, width, height, respectively) that was equipped with a UV lamp (UVA340).