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Figure 9


Fig. 9. Amounts of Fe and Zn in the solution of suspensions of sludge and 95% sludge–5% sphalerite mixtures as a function of oxidation time. A logarithmic scale is used for the y axis to accommodate data better. According to the standard error values (not shown), differences between sludge and sludge + sphalerite are significant for Zn, but not Fe in solution.





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The SCI Journals Agronomy Journal Crop Science
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