Inorganic Elements Identified from the Water Extracts of the Various SU Bags Studied
| SU system | B (ng/cm2) | Na (ng/cm2) | Si (ng/cm2) | Ca (ng/cm2) | K (ng/cm2) |
|---|---|---|---|---|---|
| Bag 1 | 58 | 63 | 25 | ND | ND |
| Bag 2 | 50 | 58 | 18 | 9 | ND |
| Bag 3 | 84 | 91 | 90 | ND | ND |
| Bag 4 | ND | 3 | 252 | 5 | 2 |
*ND: Not detected.