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

MetalPolymer-associated metal (mg/g of polymer)aDesorbed metal (mg/g of polymer) inb:
Deionized water0.6 M NaCl
Al3+BDL1.0 ± 0.1<0.26
Fe2+/3+0.14 ± 0.030.9 ± 0.1<0.08
K+BDL10.6 ± 2.01.2 ± 1.7
Mg2+BDL31.0 ± 6.05.6 ± 3.5
Mn2+<0.020.1 ± 0.00.1 ± 0.0
Na+BDL154.5 ± 52.4
Si4+BDL3.4 ± 0.40.6 ± 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.