Fig. 9.

The amount of MS2 recovered from stainless-steel coupons that were inoculated with MS2 prior to control, bipolar ionization (BPI), and photocatalytic (PCO1) experiments, where the chamber coupons were placed on the chamber floor throughout the duration of testing, and the positive controls, which were held outside of the chamber but otherwise treated in the same manner as the chamber coupons. Recoveries are averaged over each test type and all of the coupon locations in the chamber, and error bars represent standard deviation in recoveries.