Characterization of Dissolved Organic Matter in River Water by Conventional Methods and Direct Sample Analysis-Time of Flight-Mass Spectrometry

Table 2

Characterization of DOM fractions by UV-Vis spectroscopy and organic carbon content.

	Fraction
Point	Lower than 0.45 m			Greater than 1 kDa (F1)			Lower than 1 kDa (F2)
	1	2	3	1	2	3	1	2	3
(mg·L^−1)	2.4 ± <0.1	2.9 ± <0.1	4.3 ± 0.7	0.90 ± 0.30	2.0 ± 0.4	2.4 ± 0.5	0.68 ± 0.09	1.5 ± <0.1	1.2 ± 0.1
SUVA	2.19	3.41	6.97	5.09	5.46	2.14	10.7	10.2	12.9
254/436	26.0	24.5	12.0	15.0	11.2	8.50	31.5	15.1	14.6
254/204	0.117	0.119	0.116	0.170	0.251	0.111	0.034	0.228	0.128
250/365	4.19	5.23	4.67	3.93	4.33	3.47	5.27	5.12	5.18

: organic carbon content; standard deviation.