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Fig. 6. Scanning electron microscope (SEM) image (upper left) and elemental dot maps of alum-treated biosolids, showing a big (240-µm) Ca-P particle and the location of P, S, Ca, Fe, and Al. The color intensity (white to black, or yellow to red, pink, blue, and black in the colored figures published online) reflects elemental concentration from high to low. The chemical constituents of points 1 to 6 on the SEM image (left) are shown in Table 1.

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