Table 2. Amount of total and bioavailable cadmium in contaminated field soils before and after soil-washing *.
| Soil | Soil solution | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| total | bioavailable | total | bioavailable | ||||||||
| ICP-AES | in vivo | % of total | in vitro | % of total | ICP-AES | % of total | in vivo | % of soluble total | % of total | ||
| Field soil site | 1-before | 1.82 ±0.12 | 0.49 ±0.12 | 26.92 | 0.23 ±0.05 | 12.64 | 0.189 ±0.0046 | 10.38 | 0.029 ±0.011 | 60.42 | 1.59 |
| 1-after | 0.31 ±0.07 | 0.27 ±0.07 | 87.10 | 0.22 ±0.12 | 70.96 | 0.112 ±0.0011 | 36.13 | 0.096 ±0.029 | 85.71 | 30.96 | |
| 2-before | 3.37 ±0.12 | 0.28 ±0.10 | 8.31 | 0.30 ±0.08 | 8.90 | 0.048 ±0.0015 | 1.42 | 0.034 ±0.003 | 70.83 | 1.01 | |
| 2-after | 2.36 ±0.83 | 0.40 ±0.13 | 16.95 | 0.25 ±0.17 | 10.59 | < LOD† | - | 0.018 ±0.015 | - | 0.76 | |
| 3-before | 1.80 ±0.07 | 0.45 ±0.21 | 25.00 | 0.24 ±0.04 | 13.33 | 0.049 ±0.0015 | 2.72 | 0.027 ±0.030 | 55.10 | 1.50 | |
| 3-after | 1.62 ±0.16 | 0.22 ±0.09 | 13.58 | 0.18 ±0.07 | 11.11 | < LOD† | - | 0.025 ±0.019 | - | 1.54 | |
* The values were represented as average with standard deviation as errors from more than 3 replicated tests, the unit of values was ppm (μg of cadmium/g of soil), % of total was the percentage of determined amount out of total cadmium in samples.
† The concentration was lower than instrumental limit of detection.