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Fig. 3. Polygalacturonate-C desorption from goethites during phosphate sorption for 3 wk. Solid lines indicate the fit of Eq. [1] to the C desorption data of goethites with high C loadings. Coefficients of determination were >0.97. Average SE of total organic C measurements was 27 µmol g1; the maximum SE recorded was 78 µmol g1 (n = 80).
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