Table 1. pH Studies of NDRM.
| pH of solution | initial weight (g) | final weight (g) | percentage weight loss |
|---|---|---|---|
| pH 4 | 1.5738 | 1.5722 | 0.1% |
| pH 7.5 | 1.6553 | 1.6518 | 0.06% |
| pH 9 | 3.0801 | 3.0534 | 0.8% |
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