FIG. 1.

Inactivation of MS-2 by silver (0.1 mg/liter for 130 min) (column 1) and UV radiation (ca. 40 mJ/cm²) (column 2); (column 3) sum of columns 1 and 2; (column 4) silver (0.1 mg/liter for 10 min) followed by UV radiation (ca. 40 mJ/cm²) and then neutralized immediately (10-min total silver exposure); (column 5) silver (0.1 mg/liter for 10 min) followed by UV radiation (ca. 40 mJ/cm²) and then neutralized 120 min after exposure to UV (130-min total silver exposure). The difference between column 3 and column 5 was found to be statistically significant (P < 0.0001). Error bars represent 1 standard deviation.