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Fig. 3. Schematic of oxytetracycline (OTC) concentration measurements for metal-amended humic acid at pH 5.2: (a) sample spectrum of bag contents with dissolved OTC and 80 µM dissolved Al, and (b) comparison spectra of OTC standards prepared with 80 µM total Al. The dotted line in (b) shows the OTC spectrum in the absence of Al.

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