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Fluorescence Analysis of a Standard Fulvic Acid and Tertiary Treated Wastewater

Department of Civil and Environmental Engineering, Arizona State University, Box 5306, Tempe, AZ

View larger version (21K): [in a new window]   Fig. 1. Ultraviolet and visible (UV/Vis) spectra for the unfractionated dissolved organic carbon sample from a tertiary wastewater treatment plant (MWW) (symbols) and the Suwannee River fulvic acid sample (SRF) (lines) at pH 3 and 7 (dissolved organic carbon [DOC] = 1 mg/L).

View larger version (86K): [in a new window]   Fig. 2. Excitation–emission matrix (EEM) spectra (dissolved organic carbon [DOC] = 1 mg/L): the unfractionated dissolved organic carbon sample from a tertiary wastewater treatment plant (MWW) at pH 3 (A) with and (B) without inner-filter correction; Suwannee River fulvic acid sample (SRF) at pH 3 (C) with and (D) without inner-filter correction; SRF at pH 7 (E) with and (F) without inner-filter correction.

View larger version (22K): [in a new window]   Fig. 3. Emission spectra (symbols) and Gaussian fit using Eq. [2] (lines) of the Suwannee River fulvic acid sample (SRF) and the unfractionated dissolved organic carbon sample from a tertiary wastewater treatment plant (MWW) (dissolved organic carbon = 1 mg/L; pH = 3; Excit = 370 nm; inner-filter correction applied).

View larger version (18K): [in a new window]   Fig. 4. Synchronous fluorescence spectra of the Suwannee River fulvic acid sample (SRF) (solid lines) and the unfractionated dissolved organic carbon sample from a tertiary wastewater treatment plant (MWW) (dashed lines) at variable values of (A) 20 nm, (B) 40 nm, and (C) 60 nm (dissolved organic carbon = 1 mg/L; pH = 3; inner-filter correction applied).

View larger version (16K): [in a new window]   Fig. 5. Effect of dissolved organic carbon [DOC] concentration on the synchronous fluorescence intensity at several wavelengths (275, 327, and 380 nm) for the unfractionated dissolved organic carbon sample from a tertiary wastewater treatment plant (MWW) (pH = 3; inner-filter correction applied).

View larger version (20K): [in a new window]   Fig. 6. Correlations between intensities at four different wavelengths from synchronous fluorescence spectra for mixtures with known amounts of both the Suwannee River fulvic acid sample (SRF) and the unfractionated dissolved organic carbon sample from a tertiary wastewater treatment plant (MWW) (dissolved organic carbon [DOC] of all analyzed solutions equaled 1 mg/L; pH = 3; inner-filter correction applied).