Effects of Dissolved Organic Matter on Sorption of Oxytetracycline to Sediments

Table 5

The locations of five kinds of peaks and their significance.

Peaks	-Ex/Em; (nm)	Significance	Main source and properties
P1	270/315	Protein-like	Site production, anthropogenic effluent-biodegradable
P2	285/350	Protein-like	Site production, anthropogenic effluent-biodegradable
H1	315(250)/400	Humus-like	Agricultural land, sewage-easy photolysis, poor bioavailability
	230/430
	280/380–460
H2	350(280)/460	Humus-like	Land-based, easy photodegradation, poor bioavailability
	320/366
	420/480
H3	350/450–485	Humus-like	Land-based, the degree of degradation is relatively abundant, widely spread in the water, photodegradable

() refers to the wavelength of secondly high fluorescence peaks.