Dissolution Characteristics, Stearic Acid
| pH | Analyte Concentration, mg/L | ||||
|---|---|---|---|---|---|
| Prepared | Measured | Ca | Zn | Stearate | Palmitate |
| Low pH, 0.05 M sodium phosphate buffer, 0.15 g salt per100 mL of solution | |||||
| 2.5 | 2.8 | <0.01 | 0.05 | 0.14 | <0.05 |
| 3.0 | 3.1 | <0.01 | <0.01 | 0.19 | <0.05 |
| 3.5 | 3.6 | <0.01 | <0.01 | <0.05 | <0.05 |
| 4.0 | 4.1 | <0.01 | 0.03 | <0.05 | <0.05 |
| 4.5 | 4.7 | <0.01 | 0.04 | <0.05 | <0.05 |
| Intermediate pH, 0.05 M potassium phosphate buffer, 0.15 g salt per100 mL of solution | |||||
| 5.0 | 5.1 | 0.09 | 0.02 | 0.10 | <0.05 |
| 5.5 | 5.5 | 0.10 | 0.05 | <0.05 | <0.05 |
| 6.0 | 6.0 | 0.07 | 0.02 | <0.05 | <0.05 |
| 6.5 | 6.5 | 0.07 | 0.02 | 0.45 | <0.05 |
| 7.0 | 7.0 | 0.07 | 0.01 | 0.90 | <0.05 |
| 7.5 | 7.5 | 0.04 | 0.01 | 0.44 | <0.05 |
| High pH, 0.025 M borate (sodium borate decihydrate) buffer, 0.5 g salt per 100 mL of solution | |||||
| 8.0 | 7.9 | 0.03 | <0.01 | 0.31 | <0.05 |
| 8.5 | 8.5 | 0.01 | <0.01 | 0.35 | <0.05 |
| 9.0 | 9.0 | 0.27 | 0.02 | 0.53 | <0.05 |
| 9.5 | 9.3 | 0.07 | <0.01 | 0.31 | <0.05 |
| 10.0 | 9.8 | 0.02 | <0.01 | 0.37 | <0.05 |
| 10.5 | 10.1 | 0.03 | <0.01 | 0.23 | <0.05 |
| 11.0 | 10.3 | <0.01 | <0.01 | 0.09 | <0.05 |