Term
| O is found in soil predominantly in this valence state |
|
Definition
|
|
Term
| the role of O in the O0 valence state |
|
Definition
| it is an important electron acceptor, serving as an oxidant in redox rxns |
|
|
Term
| an important and helpful rule of thumb for redox rxns |
|
Definition
| 1 electron will be consumed by 1/4 O2 when O2 is the oxidant |
|
|
Term
| when inorganic S occurs in the -II oxidation state |
|
Definition
| in highly reduced soil systems (anoxic) |
|
|
Term
| when S occurs in the VI oxidation state |
|
Definition
| in systems other than highly reducing environments |
|
|
Term
| where 95-99% of the total soil S is found |
|
Definition
|
|
Term
| where S can occur in both the -II and VI oxidation states |
|
Definition
|
|
Term
| the behavior of inorganic S in soil is generally controlled by... |
|
Definition
| the interactions of the SO42- ion |
|
|
Term
| the importance of sulfate in soil solution |
|
Definition
-it's an important ligand in soil solutions, forming stable, soluble complexes with a host of metal cations
-generally an exchangeable anion and a significant component of the anion exchange |
|
|
Term
| when sulfate may participate in ligand exchange rxns |
|
Definition
| under strongly acidic conditions |
|
|
Term
| oxidation states in which Se can occur |
|
Definition
|
|
Term
| Se species that are stable in the presence of O2 |
|
Definition
| -selenite (HSeO3- and SeO32-)
-selenate (SeO42-) |
|
|
Term
| the species of Se that are stable in highly reduced (anoxic) environments |
|
Definition
| -elemental Se
-selenide (H2Se and HSe-) |
|
|
Term
| the species of Se that tends to dominate in acidic systems |
|
Definition
| selenite (HSeO3- and SeO32-) |
|
|
Term
| the species of Se that tends to dominate in alkaline systems |
|
Definition
|
|
Term
| speciation of Se in soil is similar to that of... |
|
Definition
|
|
Term
| the Se content of soil is generally dictated by... |
|
Definition
|
|
Term
| Se species that form stable, soluble complexes with a host of metal cations |
|
Definition
-selenide
-selenite
-selenate |
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
| does Se form mineral precipitates in soil? |
|
Definition
|
|
