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 × 10^8	1.20850 × 10^8	1.30500 × 10^8
Relative error	0.001%	7.395%	—
2	0.65248 × 10^8	0.59425 × 10^8	0.65250 × 10^8
Relative error	0.003%	8.927%	—
3	0.32629 × 10^8	0.28675 × 10^8	0.32625 × 10^8
Relative error	0.012%	12.107%	—
4	0.16323 × 10^8	0.14613 × 10^8	0.16313 × 10^8
Relative error	0.061%	10.421%	—
5	0.08119 × 10^8	0.07613 × 10^8	0.08156 × 10^8
Relative error	0.450%	6.658%	—
6	0.04082 × 10^8	0.04300 × 10^8	0.04078 × 10^8
Relative error	0.098%	5.444%	—
7	0.02033 × 10^8	0.02425 × 10^8	0.02039×10^8
Relative error	0.290%	18.931%	—
8	0.01278 × 10^8	0.01675 × 10^8	0.01223 × 10^8
Relative error	4.500%	36.958%	—
Average relative error	0.677%	13.355%	—