Patent US5569305A successfully refreshed from Google Patents.
Patent US3659100A successfully refreshed from Google Patents.
US3659100A
Expired / Lapsed
US
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System and method of air pollution monitoring utilizing chemiluminescence reactions
Assignee: Geomet Inc
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Filing: 1970-08-14
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Granted: 1972-04-25
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Expires: 1990-08-14
Abstract
Abstract An instrumental system and method for detecting and analyzing pollutant gases in the atmosphere, particularly sulfur dioxide, ozone, nitrogen dioxide, and nitric oxide utilizing the catalyzed chemiluminescence reaction of luminol (5-amino-2, 3-dihydro-1-4phthalazinedione) with hydrogen peroxide. Sampled air streams, after appropriate treatment by adsorption column, are reacted with surface films of luminol-hydrogen peroxide solutions to give continuous, real time analysis of pollutant gases. The chemiluminescence method of monitoring air pollutants utilizes five or six microreactors (channels) simultaneously which are monitored sequentially by a single photomultiplier. Channel monitoring is controlled by a rotary shutter which moves discretely from channel (microreactor) to channel. Quantitative analysis of the gaseous components of the atmosphere is obtained by comparison of the signals obtained from the separate channels with calibrated standards for each channel. Signal processing may utilize simple computer circuitry.
Inventors
- 👤 Howard H Anderson
- 👤 Rudolph H Moyer
- 👤 Donald J Sibbett
- 👤 David C Sutherland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:11
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0011; G01N33/0013; G01N21/00; G01N21/75; G01N21/76; G01N21/766; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/177692; Y10T436/179228; Y10T436/18; Y10T436/186; Y10T436/20; Y10T436/206664
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
33 words
2. A system as claimed in claim 1, wherein the pollutant gases are reacted by direct reaction betwEen the pollutant components and an aqueous mixture of luminol (5-amino-2-, 3-dihydro-1, 4-phthalazinedione) and hydrogen peroxide.
Claim 2
Dependent Claim
24 words
A system as claimed in claim 2, and means to mix the aqueous chemical reagents immediately prior to reaction with the gaseous air pollutants.
Claim 3
Dependent Claim
27 words
A system as claimed in claim 3, and means to produce required intimate contact between the pollutant gases and the light-producing chemical reagents in an optical cell.
Claim 4
Dependent Claim
27 words
A system as claimed in claim 4, and means to separate the components of the pollution gas mixture prior to entry into a plurality of reaction cells.
Claim 5
Dependent Claim
19 words
A system as claimed in claim 5, and means to monitor multiple gas streams by a single photomultiplier sensor.
Claim 6
Dependent Claim
23 words
A system as claimed in claim 6, and means to simultaneously monitor a mixture of air pollutants with a real-time readout or analysis.
Claim 7
Dependent Claim
21 words
A system as claimed in claim 7, and means to eliminate chemical interferences in the analysis of the separate pollution components.
Claim 8
Dependent Claim
23 words
A system as claimed in claim 8, and means to selectively view a series of chemical reactor cells on a preselected time sequence.
Claim 9
Dependent Claim
18 words
A system as claimed in claim 9, and means to automatically control viewing time at each optical cell.
Claim 10
Dependent Claim
33 words
A system as claimed in claim 10, and means to extend the sensitivity range of a photomultiplier sensor by introduction of selected optical filtering materials between a light source and a light sensor.
Claim 11
Dependent Claim
24 words
A system as claimed in claim 11, and means to introduce a series of optical filters between the reaction cells and the photomultiplier sensor.
Claim 12
Independent Claim
121 words
A method for monitoring gaseous pollutants in the air, including sulfur dioxide, nitrogen dioxide, ozone, nitric oxide, chlorine, and other oxidants, comprising: A. sampling ambient air for suspected pollutant gases contained therein; B. selectively reacting in a chemiluminescence reactor cell various of said pollutant gases in said ambient air with aqueous solutions of luminol and hydrogen peroxide which produce light during reaction with the pollutants in a two phase reaction including: i. an aqueous phase containing luminol which is oxidized to produce photons; and ii. a gas phase which reacts in the cell with luminol at the interface between the gas and liquid surface; and C. detecting and quantitatively analyzing the pollutant contents developed in the reactions by produced light measurements.
Claim 13
Dependent Claim
32 words
A method as claimed in claim 1, wherein the pollutant gases are reacted by direct reaction between the pollutant components and an aqueous mixture of luminol (5-amino-2-, 3-dihydro-1, 4-phthalazinedione) and hydrogen peroxide.
Claim 14
Dependent Claim
23 words
A method as claimed in claim 14, including intimately contacting the pollutant gases and the light producing chemical reagents in an optical cell.
Claim 15
Dependent Claim
23 words
A method as claimed in claim 15, including separating the components of the pollution gas mixture prior to entry into a reaction cell.
Claim 16
Dependent Claim
17 words
A method as claimed in claim 16, including monitoring multiple gas streams in a single photomultiplier sensor.
Claim 17
Dependent Claim
21 words
A method as claimed in claim 17, including simultaneously monitoring a mixture of air pollutants with a real-time readout or analysis.
Claim 18
Dependent Claim
19 words
A method as claimed in claim 18, including eliminating chemical interferences in the analysis of the separate pollution components.
Claim 19
Dependent Claim
23 words
A method as claimed in claim 19, including selectively viewing a series of reactions in chemical reactor cells on a pre-selected time sequence.
Claim 20
Dependent Claim
16 words
A method as claimed in claim 20, including automatically controlling viewing time at each optical cell.
Claim 21
Dependent Claim
30 words
A method as claimed in claim 21, including extending the sensitivity range of a photomultiplier sensor by introducing selected optical filtering materials between a light source and a light sensor.
Claim 22
Dependent Claim
22 words
A method as claimed in claim 22, including introducing a series of optical filters between the reaction cells and the photOmultiplier sensor.
References Cited (Backward Citations)
US3359973A
Cited
US3457407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |