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Time dependent release of sodium lignosulfonate (SLS) from the CaCO3 micro-containers under different pH values of the aqueous solutions.
| Time/(h) | pH | Absorbance/(a.u.) | Concentration/(mg/L) |
|---|---|---|---|
| 24 | 4 | 0.107 | 38.816 |
| 7 | 0.075 | 30.395 | |
| 10 | 0.039 | 20.921 | |
| 48 | 4 | 0.104 | 38.026 |
| 7 | 0.058 | 25.921 | |
| 10 | 0.038 | 20.658 | |
| 72 | 4 | 0.094 | 35.395 |
| 7 | 0.058 | 25.921 | |
| 10 | 0.049 | 23.553 |
