Measuring and testing – Sampler – sample handling – etc. – Capture device
Patent
1982-08-05
1985-05-21
Swisher, S. Clement
Measuring and testing
Sampler, sample handling, etc.
Capture device
7386401, 7386422, 356312, B01L 302, G01N 3506
Patent
active
045178500
ABSTRACT:
A method relating to deposition of a liquid sample mixture in the tubular furnace of a spectrophotometer. The method involves drawing a quantity of each ingredient of the sample mixture into a conduit in a predetermined sequence and also drawing a slug of air into the conduit immediately following the uptake of each ingredient. In the result, a segmented fluid stream is created in which a slug of air separates each two adjacent ingredient segments. The conduit is initially filled with a rinsing fluid and the segmented fluid stream displaces some of that rinsing fluid from the conduit. A slug of air separates the rinsing fluid from the segmented stream. The segmented stream is then discharged in a single operation into the furnace of the spectrophotometer so that mixing of the ingredients occurs at or adjacent the furnace surface. Apparatus for carrying out the method comprises a syringe connected to a nozzle through a conduit, a source of rinsing fluid connected into the conduit at a location between the nozzle and syringe, and means for moving the nozzle across a plurality of ingredient pick-up stations, a rinse station and a deposition station at which the furnace is located.
REFERENCES:
patent: 4042338 (1977-08-01), Huber
patent: 4068529 (1978-01-01), Konig
patent: 4235840 (1980-11-01), Mendoza et al.
Huberts John T.
Wiseman Alan G.
Berkowitz Edward H.
Cole Stanley Z.
Swisher S. Clement
Varian Associates Inc.
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