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Table 1 Calculations from optical measurements of each sample

From: Characterization of terrestrial dissolved organic matter fractionated by pH and polarity and their biological effects on plant growth

Sample SUVA254 FI EEMs Peak Areas
(L mg −1 m −1 ) % A % C % T
Whole 8.35 1.34 61% 37% 2%
Acid insoluble 8.00 1.13 62% 35% 3%
Acid soluble 6.50 1.40 59% 39% 2%
C18 filtrate 5.16 1.44 56% 41% 2%
C18 retentate 6.53 1.29 61% 36% 3%
  1. SUVA254: specific ultraviolet absorbance at 254 nm.
  2. FI: fluorescence index, emission ratio of 420:520 nm at excitation 370 nm.
  3. Peak A: 240–300 nm Ex; 400–500 nm Em.
  4. Peak C: 300–360 nm Ex; 400–500 nm Em.
  5. Peak T: 240–300 nm Ex; 250–350 nm Em.
  6. Absorbance and EEMs fluorescence spectra are shown in Figure 2.