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Extractable Cr for HRS and samples from the contaminated groundwater zone (the ground surface elevation at the drill-hole location is 5.0 m ASL).
| Extractable Cr (× 10−8 mol/kg) | |||||
|---|---|---|---|---|---|
| Depth (mbgs) | H2O2 extraction | RSD (%) | NaOH extraction | RSD (%) | |
| HRS | 37–48 | 102 ± 6 | 5 | 21 ± 1 | 4 |
| Sample #9 | 22.5 | 492 ± 58 | 12 | 673 ± 119 | 18 |
| Sample #85 | 39.4 | 335 ± 37 | 11 | 98 ± 17 | 18 |
| Sample #86 | 39.8 | 160 ± 15 | 10 | 25 ± 1 | 2 |
| Sample #87 | 40.1 | 331 ± 17 | 5 | 73 ± 12 | 14 |
