Method and apparatus for generating and transferring a gaseous test sample
First Claim
1. A device for generating a gaseous test sample from a liquid sample and for transferring this test sample into a measuring cuvette of an atomic absorption spectrometer comprising:
- a measuring cuvette;
a sample vessel;
inert gas inlet passage means and an inert gas outlet conduit, each having one end respectively in fluid flow communication with the interior of said sample vessel;
inert gas inlet conduit means for connecting said inert gas inlet passage means to an inert gas source;
said inert gas outlet conduit being arranged to form fluid flow communication between the interior of said sample vessel and said measuring cuvette;
said inert gas inlet conduit means including a pair of branch lines disposed in operative parallel relationship, the first branch line containing first restriction means and the second branch line containing second restriction means, first valving means for selectively directing the flow of inert gas to one or the other or both of said branch lines to thereby selectively provide a first flow rate of gas and a second substantially lower rate of flow of inert gas;
control means for automatically controlling said first valving means; and
means for adding a reagent to said sample vessel.
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Accused Products
Abstract
Method and apparatus for generating a gaseous test sample from a liquid sample and for transferring this test sample into a measuring cuvette of an atomic absorption spectrometer, in which an inert gas flow is directed through a sample vessel and into a measuring cuvette and, after the air has been displaced from the sample vessel, a reagent is added for generating a gaseous test sample, the test sample being carried into the measuring cuvette by the inert gas flow, wherein prior to the adding of the reagent, the flow rate of the inert gas flow is changed-over from a higher value to a lower value.
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Citations
8 Claims
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1. A device for generating a gaseous test sample from a liquid sample and for transferring this test sample into a measuring cuvette of an atomic absorption spectrometer comprising:
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a measuring cuvette; a sample vessel; inert gas inlet passage means and an inert gas outlet conduit, each having one end respectively in fluid flow communication with the interior of said sample vessel; inert gas inlet conduit means for connecting said inert gas inlet passage means to an inert gas source; said inert gas outlet conduit being arranged to form fluid flow communication between the interior of said sample vessel and said measuring cuvette; said inert gas inlet conduit means including a pair of branch lines disposed in operative parallel relationship, the first branch line containing first restriction means and the second branch line containing second restriction means, first valving means for selectively directing the flow of inert gas to one or the other or both of said branch lines to thereby selectively provide a first flow rate of gas and a second substantially lower rate of flow of inert gas; control means for automatically controlling said first valving means; and means for adding a reagent to said sample vessel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification