Chemistry: analytical and immunological testing – Automated chemical analysis – With a continuously flowing sample or carrier stream
Patent
1992-12-31
1995-05-30
Housel, James C.
Chemistry: analytical and immunological testing
Automated chemical analysis
With a continuously flowing sample or carrier stream
436175, 422 21, 422 81, 422186, 219679, 219693, 20415743, 2041582, 204302, 204308, 361327, G01N 3508
Patent
active
054200393
ABSTRACT:
A process and apparatus for controlled continuous microwave digestion of samples of materials to prepare them for subsequent analyses or other chemical operations. The material to be analyzed, in finely divided form and mixed with digesting liquid, such as a strong acid, is charged as a slug into a flowing liquid carrier stream, usually water, which stream, containing the slug, is passed in a tube through a zone in which the tube and contents are subjected to microwave radiation, to heat the digesting liquid and the material to be digested to promote the digestion. The process and apparatus are modified by inclusion of detecting and controlling steps and corresponding apparatus components to detect a condition of the flowing liquid without physically contacting it, as by determining the dielectric constant of contents of the tube, or a related property of such contents at one or more locations of the tube, usually outside the microwave zone, and controlling operations of the process and apparatus accordingly. Such controlled or controllable operations include charging of subsequent slugs to the system, feeding digested slugs or portions thereof to an autosampler, and backwashing of a filter, and in such operations the controlling device is preferably a microprocessor or computer activated by signals from the detection component and automatically operates appropriate valves, pumps and autosampler. Also within the invention is a procedure for converting a manual process, such as that described to an automatic one.
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King Edward E.
Renoe Brian W.
Yurkovich Dale A.
CEM Corporation
Housel James C.
Kramer Raymond F.
Wallenhorst Maureen M.
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