TABLE 3.
Profile of metals bound to PE12 and ability of the polymer to desorb sediment-adsorbed metals under nonionic (deionized water) and ionic (0.6 M NaCl) strength conditions
| Metal | Polymer-associated metal (mg/g of polymer)a | Desorbed metal (mg/g of polymer) inb:
|
|
|---|---|---|---|
| Deionized water | 0.6 M NaCl | ||
| Al3+ | BDL | 1.0 ± 0.1 | <0.26 |
| Fe2+/3+ | 0.14 ± 0.03 | 0.9 ± 0.1 | <0.08 |
| K+ | BDL | 10.6 ± 2.0 | 1.2 ± 1.7 |
| Mg2+ | BDL | 31.0 ± 6.0 | 5.6 ± 3.5 |
| Mn2+ | <0.02 | 0.1 ± 0.0 | 0.1 ± 0.0 |
| Na+ | BDL | 154.5 ± 52.4 | |
| Si4+ | BDL | 3.4 ± 0.4 | 0.6 ± 0.1 |
| Ca2+ | 141.5 ± 26.2 | <0.06 | <0.23 |
| Ba2+ | BDL | <0.003 | <0.004 |
| Cu2+ | BDL | <0.13 | <0.11 |
| Li+ | <0.005 | <0.001 | <0.001 |
| Sr2+ | 2.7 ± 0.5 | <0.01 | <0.01 |
| Zn2+ | BDL | <0.05 | <0.04 |
a
Nondialyzable metal concentration associated with the polymer.
b
Values represent the amount of metal desorbed by the polymer after subtracting any background metal concentrations contributed by the polymer or sediment to the aqueous phase. BDL, below detection limit.