TABLE 2.
Chemical compositions of original and incubated aquatic sediments and of sediments in a black layer
| Element | Amt in sample (g/kg, unless indicated otherwise)a
|
|||||
|---|---|---|---|---|---|---|
| HCl extractable
|
Total
|
|||||
| Original sediment | Incubated sediment | Black-layer sediment | Original sediment | Incubated sediment | Black-layer sediment | |
| TOC (%) | ND | ND | ND | 1.03 | 1 | 1.16 |
| Fe(II) | 4.15 | 6.02 | 6.67 | ND | ND | ND |
| Fe(total) | 5.28 | 7.58 | 9.47 | 33.94 | 32.38 | 35.95 |
| Mn | 0.7 | 0.99 | 1.01 | 1.01 | 0.99 | 1.24 |
| S2− | 0.22 | 0.32 | 0.28 | ND | ND | ND |
| U | 0.38 | 0.59 | 0.58 | 0.5 | 0.75 | 0.76 |
a
All values are means from at least duplicate measurements and ranged within <10% error, unless indicated otherwise. ND, not determined.