Table 2. Properties of Chelants Used in IFT Tests.
| chelating agents | concentration, wt % | solution pH |
|---|---|---|
| EDTA | 20 | 8 |
| 15 | 8 | |
| 10 | 8 | |
| HEDTA | 20 | 4 |
| 15 | 4 | |
| 10 | 4 |
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