Extraction of humic substance can be done by______________________?
Correct answer: C. NaOH
- A. NH4OH
- B. NH4Cl
- C. NaOH
- D. None of the above
Explanation
Humic substances are commonly extracted from soil organic matter with alkaline sodium hydroxide, which dissolves humic and fulvic fractions. Ammonium salts and ammonium hydroxide are not the standard extractant in this procedure.
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