US3684884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus to be used for the analysis of traces of chemical elements through atomic absorption
Assignee: Individual
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Filing: 1970-01-15
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Granted: 1972-08-15
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Expires: 1990-01-15
Abstract
Abstract For the purpose of spectrophotometric analysis through atomic absorption technique, an absorption chamber containing an amount of the sample to be analyzed mixed with a plasmogen gas is inserted into the path of a radiation beam having the same frequency as the characteristic frequency of the element to be measured. A plasma of a suitable gas,obtained by electromagnetic induction, is used to bring the atoms of the sample to a form capable of producing absorption. A reducing reagent is also added,in a mixing chamber, to the plasmogen gas containing the sample to be analyzed to enhance the absorption capability of the sample.Solid, liquid,gas samples can be analyzed The radiation intensity,attenuated along its path through an absorption chamber, is measured and,by comparison with the radiation intensity previously measured when no absorption occurred, the concentration is determined.
Inventors
- 👤 Corrado Bordonali
- 👤 Marie Antonietta Biancifiori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:53
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/71; G01N21/73
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
250 words
An apparatus for the analysis of chemical elements contained in a gaseous,liquid or solid sample through atomic absorption which apparatus comprises an absorption chamber (8), means directing into said chamber an ultraviolet radiation beam having the same frequency as the characteristic absorption frequency of the element to be analyzed, a reaction chamber (9)communicating with said absorption chamber, a mixing chamber (11) communicating with said reaction chamber, an electromagnetic induction coil (10) for high frequency current enclosing said reaction chamber, a first container (15) adapted to contain a fluid capable of being excited by electromagnetic induction and transformed into a plasma thereby which causes thermal atomic dissociation, a first line (14) connecting said first container with said mixing chamber, a second container (13) adapted to contain the sample to be analyzed when said sample is a liquid,a vessel (19) within which is provided a spraying means, a second line (13'') connecting said second container to said spraying means in said vessel, a third container (20) adapted to contain a carrier gas, a third line (20'') connecting said third container to said spraying means in said vessel, a fourth line connecting said vessel to said mixing chamber; an inlet means (16) adapted to supply said mixing chamber with the sample to be analyzed when said sample is a solid in pulverulent form,which apparatus comprises also a means, on the side of said absorption chamber opposite said directing means, for measuring the attenuation of said radiation beam by passage through said absorption chamber.
Claim 2
Independent Claim
250 words
An apparatus for the analysis of chemical elements contained in a gaseous,liquid or solid sample through atomic absorption which apparatus comprises an absorption chamber (8), means directing into said chamber an ultraviolet radiation beam having the same frequency as the characteristic absorption frequency of the element to be analyzed, a reaction chamber (9)communicating with said absorption chamber, a mixing chamber (11) communicating with said reaction chamber, an electromagnetic induction coil (10) for high frequency current enclosing said reaction chamber, a first container (15) adapted to contain a fluid capable of being excited by electromagnetic induction and transformed into a plasma thereby which causes thermal atomic dissociation, a first line (14) connecting said first container with said mixing chamber, a second container (13) adapted to contain the sample to be analyzed when said sample is a liquid,a vessel (19) within which is provided a spraying means, a second line (13'') connecting said second container to said spraying means in said vessel, a third container (20) adapted to contain a carrier gas, a third line (20'') connecting said third container to said spraying means in said vessel, a fourth line connecting said vessel to said mixing chamber; an inlet means (16) adapted to supply said mixing chamber with the sample to be analyzed when said sample is a solid in pulverulent form,which apparatus comprises also a means, on the side of said absorption chamber opposite said directing means, for measuring the attenuation of said radiation beam by passage through said absorption chamber.
Claim 3
Independent Claim
279 words
An apparatus for the analysis of chemical elements contained i n a gaseous, liquid or solid sample through atomic absorption which apparatus comprises an absorption chamber (8); means directing into said chamber an ultra-violet radiation beam having the same frequency as the characteristic absorption frequency of the element to be analyzed; a reaction chamber (9) communicating with said absorption chamber; a mixing chamber (11) communicating with said reaction chamber; an electromagnetic induction coil (10) for high frequency current enclosing said reaction chamber; a first container (15) adapted to contain a fluid capable of being excited by electromagnetic induction and transformed into a plasma thereby which causes thermal atomic dissociation of said sample; a first line (14) connecting said first container with said mixing chamber; a second container (13) adapted to contain the sample to be analyzed when said sample is a liquid; a vessel (19) within which a spraying means is provided ; a second line (13'')connecting said second container to said spraying means in said vessel; a third container (20) adapted to contain a carrier gas; a third line (20'') connecting said third container to said spraying means in said vessel; a fourth line (12) connecting said vessel to said mixing chamber; an inlet means (16) adapted to supply said mixing chamber with the sample to be analyzed when said sample is a soliD in pulverulent form; which apparatus is further provided with another inlet means (17) adapted to admit at least one reagent in said reaction chamber; which apparatus comprises also means, on the side of said absorption chamber opposite said directing means, for measuring the attenuation of said radiation beam by passage through said absorption chamber.
Claim 4
Independent Claim
279 words
An apparatus for the analysis of chemical elements contained i n a gaseous, liquid or solid sample through atomic absorption which apparatus comprises an absorption chamber (8); means directing into said chamber an ultra-violet radiation beam having the same frequency as the characteristic absorption frequency of the element to be analyzed; a reaction chamber (9) communicating with said absorption chamber; a mixing chamber (11) communicating with said reaction chamber; an electromagnetic induction coil (10) for high frequency current enclosing said reaction chamber; a first container (15) adapted to contain a fluid capable of being excited by electromagnetic induction and transformed into a plasma thereby which causes thermal atomic dissociation of said sample; a first line (14) connecting said first container with said mixing chamber; a second container (13) adapted to contain the sample to be analyzed when said sample is a liquid; a vessel (19) within which a spraying means is provided ; a second line (13'')connecting said second container to said spraying means in said vessel; a third container (20) adapted to contain a carrier gas; a third line (20'') connecting said third container to said spraying means in said vessel; a fourth line (12) connecting said vessel to said mixing chamber; an inlet means (16) adapted to supply said mixing chamber with the sample to be analyzed when said sample is a soliD in pulverulent form; which apparatus is further provided with another inlet means (17) adapted to admit at least one reagent in said reaction chamber; which apparatus comprises also means, on the side of said absorption chamber opposite said directing means, for measuring the attenuation of said radiation beam by passage through said absorption chamber.
References Cited (Backward Citations)
US2932558A
Cited
US3296435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |