Rapid Determination of Escherichia coli Concentration in Water Using Multiwavelength Transmission Spectroscopy

Table 2

The absorption peak wavelength and optical density of transmittance spectra of E. coli in different concentrations (230–320 nm).

Type	Bacteria concentration (cells/ml)	Absorption peak wavelength (λ/nm)	Optical density (a.u)
Low concentration	1.09 ×	299 nm, 300 nm	0.034
	2.18 ×	287 nm, 288 nm, 289 nm	0.042
Medium concentration	4.35 × , 8.70 × , 1.740 × , 3.480 × , 6.960 ×	No absorption peak	—
High concentration	1.3920 ×	258 nm	1.215