Integrated fixation systems
View Patent ↗The invention provides polymeric matrices and films comprising fixation reagents that are capable of reacting with solubilized metals to form less soluble metal compounds. The fixation reagenst may include inorganic sulfides and phosphates, as well as adsorbents. The polymeric matrices may be comprised of polyvinyl alcohols and polyvinyl acetates. In some embodiments, the polymeric matrix is selected to be at least as soluble as the selected fixation reagent, particularly under the conditions in which the matrix is expected to come into contact with the solublized metal.
1. A composition for fixing a solubilized metal, comprising:
a polymeric matrix having a fixation reagent incorporated therein or thereon, said polymeric matrix comprising a water-soluble polymeric component that is at least as water-soluble as the fixation reagent is under the same conditions,
wherein said fixation reagent will react with a solubilized metal to form a fixed metal compound that is less soluble than the solubilized metal, and
wherein the fixation reagent is selected from the group consisting of calcium sulfides, phosphates, and hydroxides.
2. The composition of claim 1 , wherein the polymeric component is selected from the group consisting of partially hydrolyzed PVAc and PVA.
3. The composition of claim 1 , wherein the fixation reagent comprises a sulfide, and the polymeric matrix further comprises an adsorbent capable of adsorbing hydrogen sulfide.
4. A composition of matter for fixing a solubilized metal, comprising:
a polymeric matrix having a fixation reagent incorporated therein or thereon, said polymeric matrix comprising a degradeable polymeric component selected from the group consisting of polyvinyl acetates (PVAc), polyvinyl alcohols (PVA), copolymers of PVAc and PVA, hydratable or degradeable acrylic polymers, ethyl cellulose, hydrolyzed corn starch, polyhydroxylated polymers and copolymers, polyethylene glycol, poly(beta-hydroxybutyrate), and polycaprolactone;
wherein the fixation reagent is selected from the group consisting of calcium sulfides, phosphates, and hydroxides and is capable of reacting with a solubilized metal to form a fixed metal compound that is less soluble than the solubilized metal.
5. The composition of claim 4 , wherein the fixation reagent comprises a sulfide and the polymeric matrix further comprises and adsorbent capable of adsorbing hydrogen sulfide.
6. A composition of matter for fixing a solubilized metal, comprising:
a polymeric matrix having a fixation reagent incorporated therein or thereon,
said polymeric matrix comprising a water-soluble polymeric component that is at least as water-soluble as the fixation reagent is under the same conditions,
wherein said fixation reagent comprises a calcium sulfide, phosphate, or mixture thereof, and the polymeric matrix further comprises an adsorbent capable of adsorbing hydrogen sulfide.
7. A composition of matter comprising:
a polymeric matrix having a fixation reagent incorporated therein or thereon, said polymeric matrix comprising a water-soluble polymeric component that is at least as water-soluble as the fixation reagent is under the same conditions,
wherein said fixation reagent is capable of reacting with a solubilized metal to form a fixed metal compound that is less soluble than the solubilized metal; and
a solubilized heavy metal.
8. A composition of matter for fixing a solubilized metal, comprising:
a polymeric matrix having a fixation reagent incorporated therein or thereon,
said polymeric matrix comprising a water-soluble polymeric component that is at least as water-soluble as the fixation reagent is under the same conditions, and
wherein said fixation reagent is selected from the group consisting of calcium sulfides, calcium phosphates, and a mixture of calcium sulfides and calcium phosphates.
9. An apparatus comprising:
a solubilized metal separated from a fixation reagent by a barrier comprising a polymeric matrix having the fixation reagent incorporated therein or thereon, wherein said fixation reagent will react with a solubilized metal to form a fixed metal compound that is less soluble than the solubilized metal.
10. The apparatus of claim 9 , wherein the solubilized metal is selected from the group consisting of the following elements and compounds thereof: lead, nickel, cadmium, mercury, zinc, silver, vanadium, arsenic, beryllium, selenium, antimony, barium, chromium, thallium, cobalt, uranium, plutonium, thorium, strontium, cadmium, and americium.
11. An apparatus comprising a barrier separating a solubilized metal from a fixation reagent, wherein the barrier comprises a polymeric matrix having a fixation reagent incorporated therein or thereon, and wherein said polymeric matrix is capable of being degraded by action of one or more of water, bacteria, sunlight, elevated temperature, and pH.