Chemistry: analytical and immunological testing – Automated chemical analysis – With a continuously flowing sample or carrier stream
Patent
1991-03-04
1992-08-18
Johnston, Jill
Chemistry: analytical and immunological testing
Automated chemical analysis
With a continuously flowing sample or carrier stream
422 62, 422 81, 422 8205, 422 8209, 436135, G01N 2101, G01N 2175, G01N 3122
Patent
active
051399563
ABSTRACT:
The peroxide content of a non-aqueous medium is measured by a system including separate supplies for two carrier solutions, a first one containing an acid for acidifying the sample and the second containing an iodide compound for reacting with the peroxide(s) in the sample and producing a free iodine ion, such as I.sub.3.sup.-, and a flow-through detector, such as a colorimetric device. The sample and first carrier solution streams are controlled by a sample injection valve which is movable between a load position wherein the sample stream is routed to a sample waste collector via a sample loop and the first carrier solution stream passes through a first carrier solution conduit and is combined with a stream the second carrier solution prior to passing through the detector and a measure position wherein a slug of the sample is introduced into the first carrier solution conduit, mixed with the first carrier solution and combined with the second carrier solution prior to passing through the detector. The peroxide(s) in the sample reacts with the iodide compound in the second carrier solution to produce I.sub.3.sup.- which is measured by the detector.
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Karges Paul M.
Lang Gary A.
Schick Karl G.
Uhen David A.
FIAtron-Eppendorf, Inc.
Johnston Jill
Redding David
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