Title: Process for analyzing CO.sub.2 in seawater

Abstract

The process of this invention comprises providing a membrane for separating CO.sub.2 into a first CO.sub.2 sample phase and a second CO.sub.2 analyte phase. CO.sub.2 is then transported through the membrane thereby separating the CO.sub.2 with the membrane into a first CO.sub.2 sample phase and a second CO.sub.2 analyte liquid phase including an ionized, conductive, dissociated CO.sub.2 species. Next, the concentration of the ionized, conductive, dissociated CO.sub.2 species in the second CO.sub.2 analyte liquid phase is chemically amplified using a water-soluble chemical reagent which reversibly reacts with undissociated CO.sub.2 to produce conductivity changes therein corresponding to fluctuations in the partial pressure of CO.sub.2 in the first CO.sub.2 sample phase. Finally, the chemically amplified, ionized, conductive, dissociated CO.sub.2 species is introduced to a conductivity measuring instrument. Conductivity changes in the chemically amplified, ionized, conductive, dissociated CO.sub.2 species are detected using the conductivity measuring instrument.

Inventors:

Atwater, James E ^[1]; Akse, James R ^[2]; DeHart, Jeffrey ^[3]

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+ Show Inventor Affiliations

1. Eugene, OR
2. Roseburg, OR
3. Yoncalla, OR

Issue Date:

Wed Jan 01 00:00:00 EST 1997

Research Org.:

Umpqua Research Company (Myrtle Creek, OR)

OSTI Identifier:

871027

Patent Number(s):

5643799

Assignee:

Umpqua Research Company (Myrtle Creek, OR)

Patent Classifications (CPCs):

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION

G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

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B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION

B01D53/22 - by diffusion

G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

G01N33/182 - {specific anions in water
G01N33/1893 - {using flow cells}

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

Y10T436/204998 - Inorganic carbon compounds
Y10T436/255 - including use of a solid sorbent, semipermeable membrane, or liquid extraction

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DOE Contract Number:  

FG03-93ER81641

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

process; analyzing; seawater; comprises; providing; membrane; separating; sample; phase; analyte; transported; liquid; including; ionized; conductive; dissociated; species; concentration; chemically; amplified; water-soluble; chemical; reagent; reversibly; reacts; undissociated; produce; conductivity; changes; therein; corresponding; fluctuations; partial; pressure; finally; introduced; measuring; instrument; detected; sample phase; comprises providing; measuring instrument; liquid phase; partial pressure; phase including; reversibly react; chemical reagent; changes therein; analyte phase; /436/73/422/