US4816412A
Expired / Lapsed
US
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Method for the determination of the content of solid carbon compounds in soil samples
Assignee: Emerson Process Management GmbH and Co OHG
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Filing: 1986-08-15
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Granted: 1989-03-28
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Expires: 2006-08-15
Abstract
Abstract Method for the determination of the content of solid carbon compounds in soil samples, particularly in humus soils, by converting the solid carbon compounds with a reactant into carbon dioxide and conveying the carbon dioxide gas into an analyzer. To reach the reaction temperature, metal particles are added to a specified amount of the dry, milled soil sample and the dry matter is heated inductively in the presence of the reactant to the reaction temperature.
Inventors
- 👤 Manfred Schmidt
- 👤 Horst Fechter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:56
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/24; G01N31/00; G01N31/12; Y; Y10; Y10T; Y10T436/00; Y10T436/23
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
83 words
A method for the determination of the content of solid carbon compounds in a dry soil sample comprising: inductively heating said dry soil sample with a metal particle reactant and an additional reactant selected from the group consisting of oxygen and an ACID to convert the solid carbon compounds into carbon dioxide and conveying the carbon dioxide gas into an analyzer which measures said carbon dioxide gas said carbon dioxide gas being representative of the content of solid carbon compounds in said sample.
Claim 2
Independent Claim
83 words
A method for the determination of the content of solid carbon compounds in a dry soil sample comprising: inductively heating said dry soil sample with a metal particle reactant and an additional reactant selected from the group consisting of oxygen and an ACID to convert the solid carbon compounds into carbon dioxide and conveying the carbon dioxide gas into an analyzer which measures said carbon dioxide gas said carbon dioxide gas being representative of the content of solid carbon compounds in said sample.
Claim 3
Dependent Claim
34 words
The method of claim 1 wherein said metal particle reactant comprises between 50 and 95 weight percent of the total weight of said metal particle reactant, said additional reactant and said dry soil sample.
Claim 4
Dependent Claim
13 words
Method as defined in claim 1, wherein the metal particle reactant comprises copper.
Claim 5
Dependent Claim
23 words
The method of claim 1, wherein said conveying of said carbon dioxide to said analyzer is done by flushing with an inert gas.
Claim 6
Dependent Claim
69 words
The method of claim 1 further comprising adding an inorganic acid to said sample, wherein said inorganic acid is a solid that does not react with a component of said dry soil sample at room temperature but forms carbon dioxide by reaction with said solid carbon compounds at a reaction temperature brought about by said inductive heating said inorganic acid being added in excess to said dry soil sample.
Claim 7
Dependent Claim
14 words
Method of claim 5, wherein said inorganic acid is an essentially anhydrous orthophosphoric acid.
Claim 8
Dependent Claim
49 words
Method of claim 6, wherein the proportion of said metal particle reactant is between 10 and 30 weight percent, the proportion of said orthophosphoric acid is between 60 and 80 weight percent and the proportion of said dry soil sample at least 5 weight percent of the total sample.
Claim 9
Independent Claim
104 words
A method for the determination of the content of solid carbon compounds in a soil sample comprising: drying and milling a soil sample; adding a metal particle reactant and an additional reactant selected from the group consisting of oxygen and an acid to the dried soil sample; inductively heating the dried soil sample with the metal particle reactant and the additional reactant to convert solid carbon compounds of the soil sample into carbon dioxide; and conveying the carbon dioxide gas into an analyzer to measure the carbon dioxide gas, said carbon dioxide gas being representative of the solid carbon compounds in the soil sample.
Claim 10
Independent Claim
104 words
A method for the determination of the content of solid carbon compounds in a soil sample comprising: drying and milling a soil sample; adding a metal particle reactant and an additional reactant selected from the group consisting of oxygen and an acid to the dried soil sample; inductively heating the dried soil sample with the metal particle reactant and the additional reactant to convert solid carbon compounds of the soil sample into carbon dioxide; and conveying the carbon dioxide gas into an analyzer to measure the carbon dioxide gas, said carbon dioxide gas being representative of the solid carbon compounds in the soil sample.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |