Table 1 Ex and Em maxima of four components identified by PARAFAC modeling

From: A novel-approach for identifying sources of fluvial DOM using fluorescence spectroscopy and machine learning model

This study

Ex max 1° (2°), Em max (nm)

Description

The combination of TYLF and TRLF

230 (275), 340

Prevalent in natural waters, such as rivers, marines, and the Bay and Gulf of Maine49,50.

TRLF

235 (290), 355

Probably originated from sewage, biological excreta, and residuals54,55.

MHLF

245, 390

Terrestrially derived or produced autochthonously in aqueous environments from terrestrial organic substrates, might indicate microbial activity51,56.

FLF

265 (340), 460

Closely resembles soil-derived fulvic acids with high hydrophobicity and large molecular size49,52,53.

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