Table 2 Effects of UV radiation on three indicator bacteria in two different semi-synthetic metal working fluids (MWFs). Values of initial and final viable counts represent mean of six replicates (n = 6)
From: Determination of the effectiveness of UV radiation as a means of disinfection of metalworking fluids
Bacteria | UV lamp intensity (μW/cm2) | MWF samplea | Condition | Initial viable count (CFU/mL) | Final viable count (CFU/mL) | Exposure time (in h) | Death rate (k, h−1) |
|---|---|---|---|---|---|---|---|
P. fluorescens | 38 | MWF-A | Staticb | 3.9(±0.05) × 107 | 1.92 (±0.04) × 107 | 0.25 | −4.43 |
P. fluorescens | 192 | MWF-A | Static | 5.3(±0.05) × 107 | 1.4 (±0.02) × 107 | 0.16 | −8.32 |
P. fluorescens | 192 | MWF-B | Mixing | 5.35(±0.2) × 107 | 6.4 (±0.01) × 105 | 0.03 | −27.70 |
P. oleovorans subsp. lubricantis | 192 | MWF-B | Mixing | 2.5(±0.005) × 107 | 2.73 (±0.01) × 105 | 0.03 | −28.24 |
M. chelonae | 192 | MWF-B | Mixing | 3.1(±0.1) × 104 | 5.50 (±0.2) × 103 | 0.03 | −10.81 |