Table 1.
Inactivation rate constants (log10), kD, of E. coli and MS2 coliphage. For HAdV2 and B. pumilus, UV dose required for 2-log inactivation as well as log inactivation (y) as a function of UV dose (x).
| kD (cm2/mJ) ± 1SD | UV dose for 2-log reduction (mJ/cm2) (Range for ± 1SD) |
||||
|---|---|---|---|---|---|
| UV Source | E. coli | MS2 coliphage |
HAdV2 | B. pumilus spores | |
| ICC-qPCR | Cell culture | ||||
| 260 nm LED | 0.29 ± 8.1E- 3 |
0.066 ± 0.0017 |
38.3 (30.2–47.1) | 69.2 (63.2–74.9) | 143.1 (134.8–151.4) |
| 280 nm LED | 0.31 ± 0.016 | 0.052 ± 0.0013 |
41.0 (30.0–51.2) | 73.5 (64.9–79.0) | 175.9 (159.2–192.6) |
| 260|280 nm LED |
0.32 ± 0.016 | 0.061 ± 0.0010 |
41.1 (37.0–45.5) | 74.2 (65.8–79.8) | 143.6 (135.1–152.1) |
| MP UV Lamp | 0.27 ± 0.013 | 0.061 ± 0.0020 |
16.1 (14.2–17.6) | -- | 101.4 (86.8–116.0) |
| LP UV Lamp | 0.27 ± 0.010 | 0.056 ± 0.0017 |
36.9 (31.9–40.5) | -- | 188.8 (188.8–209.9) |
| Log Inactivation Curves | |||||
| UV Source | HAdV2 ICC-qPCR | HAdV2 cell culture | B. pumilus spores | ||
| 260 nm LED | y = −0.000232×2 + 0.0611x | y = 0.000219×2 + 0.0137x | y = 0.012x + 0.287 | ||
| 280 nm LED | y = −8.375E-5×2 + 0.0523x | y = 0.000272×2 + 0.00719x | y = 0.008x + 0.538 | ||
| 260|280 nm LED | y = −0.000164×2 + 0.0554x | y = 0.000353×2 + 0.00080x | y = 0.0118x + 0.311 | ||
| MP UV Lamp | y = −0.000855×2 + 0.1381x | – | y = 0.0137x + 0.608 | ||
| LP UV Lamp | y = −0.000246×2 + 0.0632x | – | y = 0.0098x + 0.143 | ||