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
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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.
Transcribed Image Text: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.
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