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Quality control materials (the ground surface elevation at the drill-hole location is 5.0 m ASL).
| QC material | Starting matrix | Spiked Cr |
|---|---|---|
| LRS | Rock (below 80 mbgs) | |
| HRS | Rock (37–48 mbgs) | |
| FRS | LRS | Cr(III)-fresh precipitated |
| Cr(III)-LRS | LRS | Cr(III) |
| Cr(VI)-LRS | LRS | Cr(VI) |
| 53Cr(III)-FRS | LRS | 53Cr(III)-fresh precipitated |
| 53Cr(VI)-FRS | FRS | Cr(III)-fresh precipitated + 53Cr(VI) |
