Table 2. Distribution of [PX-14C]-1 in an illuminated water–sediment system.
| % of the applied 14C | |||||
|---|---|---|---|---|---|
| Days | 0 | 4 | 7 | 14 | 28 |
| Volatile 14C | na | 1.9 | 7.7 | 16.9 | 30.8 |
| 14CO2 | na | 1.6 | 7.5 | 16.8 | 29.2 |
| Others | na | 0.3 | 0.2 | 0.1 | 1.6 |
| Aqueous 14C | 94.8 | 73.6 | 53.2 | 35.0 | 14.8 |
| 1 | 93.5 | 47.9 | 38.3 | 3.2 | 2.5 |
| 2 | nd | 5.9 | 4.5 | nd | nd |
| 3 | nd | 3.5 | 2.2 | nd | nd |
| 5–9 | nd | nd | nd | nd | nd |
| Others | 1.3 | 16.2 | 8.3 | 31.8 | 12.3 |
| Sediment 14C | 4.1 | 26.6 | 19.7 | 27.8 | 21.2 |
| 1 | 4.0 | 22.9 | 14.5 | 19.2 | 18.5 |
| 2 | nd | nd | 0.5 | nd | nd |
| 3 | nd | nd | 0.5 | nd | nd |
| 5–9 | nd | nd | nd | nd | nd |
| Others | 0.1 | 3.7 | 4.2 | 8.4 | 2.7 |
| Total 1 | 97.5 | 70.8 | 52.8 | 22.4 | 21.0 |
| Bound residue 14C | 0.2 | 5.5 | 10.0 | 15.8 | 23.3 |
| Total 14C | 99.1 | 107.6 | 90.6 | 95.5 | 90.1 |
| Aqueous ORP (mV) | 210 | 195 | 151 | 163 | 172 |
| pH | 8.59 | 8.52 | 8.52 | 8.41 | 8.61 |
| DO (ppm) | 5.7 | 4.1 | 4.2 | 3.9 | 6.9 |
| Sediment ORP (mV) | −80 | −51 | −180 | −172 | −85 |
| pH | 8.07 | 7.86 | 8.16 | 8.09 | 8.30 |
na: Not analyzed. nd: Not detected. Others: Consist of multiple components, none of which exceed 6.5% AR.