Research Article
Rapid Determination of Escherichia coli Concentration in Water Using Multiwavelength Transmission Spectroscopy
Table 4
Comparison of E.coli concentration in water between optimal band, single wavelength, and serial dilution plate counting method.
| No. | 388–550 nm | 600 nm | Plate count |
| 1 | 1.30501 × 108 | 1.20850 × 108 | 1.30500 × 108 | Relative error | 0.001% | 7.395% | — |
| 2 | 0.65248 × 108 | 0.59425 × 108 | 0.65250 × 108 | Relative error | 0.003% | 8.927% | — |
| 3 | 0.32629 × 108 | 0.28675 × 108 | 0.32625 × 108 | Relative error | 0.012% | 12.107% | — |
| 4 | 0.16323 × 108 | 0.14613 × 108 | 0.16313 × 108 | Relative error | 0.061% | 10.421% | — |
| 5 | 0.08119 × 108 | 0.07613 × 108 | 0.08156 × 108 | Relative error | 0.450% | 6.658% | — |
| 6 | 0.04082 × 108 | 0.04300 × 108 | 0.04078 × 108 | Relative error | 0.098% | 5.444% | — |
| 7 | 0.02033 × 108 | 0.02425 × 108 | 0.02039×108 | Relative error | 0.290% | 18.931% | — |
| 8 | 0.01278 × 108 | 0.01675 × 108 | 0.01223 × 108 | Relative error | 4.500% | 36.958% | — |
| Average relative error | 0.677% | 13.355% | — |
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