The United States of America As Represented by the Secretary of

The United States of America, As Represented by the Secretary of the Interior

USA As Represented by Secretary of the Navy

James N Huckins

Jimmie D Petty

David L Stalling

William Allen Smith

Virginia L Gibson

Thomas W May

William G Brumbaugh

David A Alvarez

Lawrence M Smith

Gary Robertson

Mark W Tubergen

Walter L Cranor

Gamini K Manuweera

Jimmie D Perry

Jon A Lebo

James A Zajicek

Raymond Wiedmeyer

James L Johnson

A zero emmission device and method for delivering constant concentration of a vaporized substance allows for the regulated use of chemical or biological substances, such as calibrating, exposure or therapeutic substances.

Constant concentration delivery device and method for vaporized substances

A device is provided for the sequestration and concentration of polar chemicals from water. The device includes a microporous hydrophilic membrane enclosure formed by a tube or facing membranes. A mixed sequestration media, contained within the enclosure, transforms dissolved polar organic chemicals into non-mobile species. The sequestration media is a triphasic admixture of a hyper-crosslinked polystyrene-divinylbenzene resin, and a carbonaceous sorbent dispersed on a size exclusion styrene-divinylbenzene copolymer.

Device for sequestration and concentration of polar organic chemicals from water

A device is provided for capturing ionic metal species (e.g., Cd, Cu, Ni, Pb and Zn) dissolved in water. The device includes a nonporous polymeric tube for capturing the dissolved ionic metal species. The tube is formed from a membrane having transient cavities therein having an average pore size greater than 10 &angst;. A sequestration medium, contained within the tube, transforms the ionic metal species captured by the tube into a complexed, non-mobile metal species. The sequestration medium is capable of diffusing through the nonporous polymeric membrane at a controlled rate to form the complexed, non-mobile species and can comprise a mixture and metal complexing agent (e.g., a quinoline) and a long chain organic acid (e.g., oleic acid).

Device for the removal and concentration of ionic metal species from water

A device is provided for removing and concentrating neutral mercury species from air and water. The device includes a nonporous polymeric membrane, preferably in the form of a flattened tube, for capturing and removing the neutral mercury species from the environment and a sequestration medium contained within the tube for transforming the neutral mercury species captured by the tube into a stabilized mercury species. The sequestration medium can comprise an acidic oxidant for transforming the neutral mercury species into a ionic soluble mercury species or a complexing agent for transforming the mercury species into a complexed soluble mercury species. The nonporous membrane can be made of a number of different synthetic polymers including polyethylene. The device is ideally suited for the passive integrative sequestration of neutral mercury species from a wide variety of environments.

Device for the removal and concentration of neutral mercury species from

A device and method for removing, concentrating and analyzing airborne organic compounds. The device includes a nonporous membrane which contains a collection media. The liquid collection media typically includes a component which has a molecular weight that is too large to pass through transport corridors in the nonporous membrane and a component which has a molecular weight which is sufficiently small enough to pass through the transport corridors in the nonporous membrane and thereby forming a thin film on the exterior surface of the device. The collection media can consist of only components too large to pass through the membrane transport corridors. Organic contaminants are trapped in the thin film on the exterior surface of the device or the membrane and transported by concentration gradient diffusion forces into the bulk of the collection media within the nonporous membrane.

Device for the removal and concentration of organic compounds from the

A binary process for the concentration and recovery of contaminants from an aqueous environment by submerging lipids (11) inside of a thin non-porous polymeric film enclosure (10) in an aqueous environment (13) to concentrate the contaminants in the lipids (11) and polymeric film (10); and, recovering contaminants or impurities from the first part or from other contaiminated lipids or biogenic extracts by sumberging the polymeric film enclosed materials (10) in a solvent medium (16).

Binary concentration and recovery process

A packing media for column chromatography having multiple separation characteristics comprises adsorbent carbon powder particles adhered to the surfaces of individual particles of a molecular size exclusion gel polymer.

Multi-chromatographic materials

An adsorbent composition comprising powdered charcoal on a support of polyurethane foam, and its use for separation of polynuclear aromatic compounds from mixtures containing them.

Adsorbent for polynuclear aromatic compounds

Polynuclear aromatic compounds are irreversibly adsorbed by coconut charcoal and are separated from desired constituents by treatment in a coconut charcoal column. This invention is particularly valuable in providing a method suitable for large scale use for removing dioxins and other undesirable polynuclear aromatic hydrocarbons which are found as impurities in small but highly toxic amounts in industrial compounds and herbicides such as 2,4,5-T, 2,4-D and derivatives thereof.

Growing community of inventors

Columbia, MO, United States of America

James N Huckins