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Regression parameter of Cr(III) and Cr(VI) with and without preconcentration.
| Condition | Concentration range (μg.L−1) | Species | Parameter |
||
|---|---|---|---|---|---|
| A | B | R | |||
| Without preconcentration | 1000–9000 | Cr(III) | -0.0060 | 0.00003 | 0.9984 |
| Cr(VI) | -0.0028 | 0.00003 | 0.9964 | ||
| With preconcentration | 50–500 | Cr(III) | -0.0037 | 0.0003 | 0.9905 |
| Cr(VI) | -0.0046 | 0.0003 | 0.9926 | ||
