The natural sulfur cycle involves many sulfur- reducing and sulfur-oxidizing bacteria. For example, S2- is oxidized to elemental sulfur and to [SO4]2-, and the reverse processes convert mobile [SO4]2- to immobilized S2-. (a). At the end of the sulfur-reduction sequence, HS- may be produced instead of S2-. What influences this outcome, and what other product is possible? (b). Sulfur-reducing bacteria can be applied to the removal of mobile heavy metals (e.g. Pb,Cd,Hg) from the environment. Explain why the metals are termed 'mobile', and describe the chemical processes and equilibria that lead to the immobilization of the metals.

The natural sulfur cycle involves many sulfur- reducing and sulfur-oxidizing bacteria. For example, S2- is oxidized to elemental sulfur and to [SO4]2-, and the reverse processes convert mobile [SO4]2- to immobilized S2-. (a). At the end of the sulfur-reduction sequence, HS- may be produced instead of S2-. What influences this outcome, and what other product is possible? (b). Sulfur-reducing bacteria can be applied to the removal of mobile heavy metals (e.g. Pb,Cd,Hg) from the environment. Explain why the metals are termed 'mobile', and describe the chemical processes and equilibria that lead to the immobilization of the metals.

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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