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Assays carried out for foreign ions.
| Foreign ion | Levels of concentration (µg L−1) | Masking agent (MA) |
|---|---|---|
| Arsenic | 0, 100, 200, 300 | Without MA KI L-Cysteine 1,10-Phenanthroline |
|
| ||
| Copper | 0, 300, 600, 1000 | Without MA KI L-Cysteine 1,10-Phenanthroline |
|
| ||
| Chromium | 0, 100, 200, 300 | Without MA KI L-Cysteine 1,10-Phenanthroline |
|
| ||
| Iron | 0, 100, 200, 300, 600, 1000 | Without MA |
