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The value of the determination coefficients indicated that the variation of 90¨C95% for extraction of Mn and Zn with HCl was attributed to the independent variables and only 5¨C10% of the total variations were not explained by the model.
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The value of the determination coefficients indicated that the variation of 90¨C95% for extraction of Mn and Zn with HCl was attributed to the independent variables and only 5¨C10% of the total variations were not explained by the model.

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