Comparing the Heterogeneity of Copper-Binding Characteristics for Two Different-Sized Soil Humic Acid Fractions Using Fluorescence Quenching Combined with 2D-COS

<table>Changes in the synchronous fluorescence spectra for (a) the 1–10 KDa fraction and (b) the &gt;100 KDa fraction of the soil HA upon the addition of copper. The thin long arrows refer to the direction of the increasing copper concentrations. The vertical shaded arrows indicate the locations of the wavelengths for a representative peak of each fraction.</table>

The Scientific World Journal

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Figure 1

Figure 1: Comparing the Heterogeneity of Copper-Binding Characteristics for Two Different-Sized Soil Humic Acid Fractions Using Fluorescence Quenching Combined with 2D-COS 

Figure 1 | Comparing the Heterogeneity of Copper-Binding Characteristics for Two Different-Sized Soil Humic Acid Fractions Using Fluorescence Quenching Combined with 2D-COS 