21. If you add a cation to soil and it adsorbs via a bidentate reaction on proto

Question

21. If you add a cation to soil and it adsorbs via a bidentate reaction on protonated functional groups, how many protons will be released?

22. What is ligand exchange and what surfaces will it be an important adsorption mechanism?

23. What pH values will you expect more sorption of anions and cations on variable charge soils? What are the dominant minerals in a variable charge soil?

24. How will pH affect sorption in permanent charge soils? Explain.

25. Give examples of how adsorption concepts are used in soil science.

Explanation / Answer

21.

If cation is monovalent like Na+ , the number of protons released is 1.

If cation is divalent like Mg+2 , the number of protons released is 2.

If cation is trivalent like Al+3 , the number of protons released is 3.

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