Table 2.
Nitrate-N balance for the denitrification linked to As(III) oxidation in the batch experiment to determine terminal products of N
| Parameters | Abiotic | As(III)+Nitrate | As(III)+nitrate +Acetylene | Nitrate | Nitrate+ Acetylene |
|---|---|---|---|---|---|
| As(III) removed (mM) | — | 3.51±0.11 | 2.50±0.31 | — | — |
| As(V) formed (mM) | — | 3.20±0.06 | 2.16±0.43 | — | — |
| NO3− consumed (mM) | 0.06±0.05 | 1.74±0.02 | 1.44±0.13 | 0.41±0.03 | 0.51±0.05 |
| Corrected NO3− consumed (mM) | — | 1.33±0.06 | 1.10±0.19 | — | — |
| N2O-N formed (mmol/Lliquid) | 0.00±0.00 | 0.00±0.00 | 1.15±0.04 | 0.30±0.01 | 0.34±0.14 |
| N2-N formed (mmol/Lliquid) | 0.25±0.03 | 2.10±0.17 | 0.22±0.14 | 0.22±0.02 | 0.00±0.00 |
| Total gas-N formed (mmol/Lliquid) | 0.25±0.03 | 2.10±0.17 | 1.37±0.14 | 0.53±0.03 | 0.39±0.14 |
| Corrected total gas-N formed (mmol/Lliquid) | — | 1.43±0.09 | 1.03±0.12 | — | — |
| Corrected total gas-N formed/ Corrected NO3− consumed | — | 1.07±0.02 | 0.94±0.03 | — | — |
| Mol As(III) removed/corrected* mol NO3− | — | 2.65±0.09 | 2.29±0.22 | — | — |
| Mol As(V) formed/corrected* mol NO3− | — | 2.41±0.05 | 1.96±0.26 | — | — |
| Mol As(III) removed/corrected* mol total gas-N formed | — | 2.66±0.27 | 2.43±0.30 | — | — |
| Mol As(V) formed/corrected* mol total gas-N formed | — | 2.42±0.25 | 2.09±0.42 | — | — |
*
Corrected for endogenous nitrate consumption measured in nitrate treatment