US4255386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for destroying organic matter to facilitate trace inorganic element analysis
Assignee: United States Department of Health and Human Services
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Filing: 1978-11-30
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Granted: 1981-03-10
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Expires: 1998-11-30
Abstract
Abstract The apparatus of the present invention includes a quartz flask for containing 71% nitric acid and the organic matrix to be destroyed, a Soxhlet extractor disposed above the flask, and a Friedrich coldfinger reflux condenser disposed above the extractor. A Meeker or Fisher burner is employed to provide heat to the flask and distill the acid, and the vapors are condensed within the condenser and transmitted to the extractor. An adjustable volume displacement cylinder is disposed within the extractor so as to control siphoning of the acid condensate from the extractor back into the flask. The distillation-condensation-siphoning procedure of the present invention is automatically operative once the displacement cylinder is adjusted. The organic matrix is completely destroyed so as to produce a clear, colorless acid solution within which the trace inorganic salts are disposed. The acid solution may be subsequently qualitatively and quantitatively analyzed in accordance with known techniques.
Inventors
- 👤 Myron M. Schachter
- 👤 Kenneth W. Boyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:01
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/84; G01N25/00; G01N25/14; Y; Y10; Y10S; Y10S203/00; Y10S203/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
278 words
Apparatus for completely destroying organic matter in order to facilitate trade inorganic element analysis, comprising: flask means for housing acid means and an organic matrix; means disposed beneath said flask means for heating said acid means so as to distill the same; condenser means disposed above said flask means for condensing said distillation vapors; means disposed between said flask means and said condenser means for controlling the return of said condensed vapors to said flask means such that said distillation-condensation cycle proceeds automatically; said control means including means for delaying said return of said condensed vapors to said flask for a predetermined time period during which said acid within said flask is distilled to dryness, with said flask being heated to a dull red state, and with said organic matrix being charred; said delay means comprising siphoning means interposed between said condensing means and said flask means; said siphoning means including adjustable means being adjustable so as to properly control said return of said acid condensate to said flask means in said time-delayed manner; said siphoning means comprising a Soxhlet extractor disposed between said flask means and said condenser means having said adjustable means disposed therein, said adjustable means comprising a volume displacement cylinder adjustably disposed within said extractor having dimensions approximating that of the inside wall of said soxhlet extractor for determining the commencement time of said siphoning of said acid condensate, said ajustable means further comprising lever and link means located within a housing means between said soxhlet extractor and said flask means, said cylinder being suspended in said soxhlet extractor by lever and link means regulating the position of the cylinder within said soxhlet extractor.
Claim 2
Dependent Claim
278 words
Apparatus for completely destroying organic matter in order to facilitate trade inorganic element analysis, comprising: flask means for housing acid means and an organic matrix; means disposed beneath said flask means for heating said acid means so as to distill the same; condenser means disposed above said flask means for condensing said distillation vapors; means disposed between said flask means and said condenser means for controlling the return of said condensed vapors to said flask means such that said distillation-condensation cycle proceeds automatically; said control means including means for delaying said return of said condensed vapors to said flask for a predetermined time period during which said acid within said flask is distilled to dryness, with said flask being heated to a dull red state, and with said organic matrix being charred; said delay means comprising siphoning means interposed between said condensing means and said flask means; said siphoning means including adjustable means being adjustable so as to properly control said return of said acid condensate to said flask means in said time-delayed manner; said siphoning means comprising a Soxhlet extractor disposed between said flask means and said condenser means having said adjustable means disposed therein, said adjustable means comprising a volume displacement cylinder adjustably disposed within said extractor having dimensions approximating that of the inside wall of said soxhlet extractor for determining the commencement time of said siphoning of said acid condensate, said ajustable means further comprising lever and link means located within a housing means between said soxhlet extractor and said flask means, said cylinder being suspended in said soxhlet extractor by lever and link means regulating the position of the cylinder within said soxhlet extractor.
References Cited (Backward Citations)
US4006062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |