Automatic chemical analyzer

• US 4,022,575 A
• Filed: 09/15/1975
• Issued: 05/10/1977
• Est. Priority Date: 09/16/1974
• Status: Expired due to Term

• Current Assignee: Bifok AB Sollentuna Sweden
• Original Assignee: Block Engineering, LLC
• Inventors: Hansen, Elo Harald, Ruzicka, Jaromir
• Primary Examiner(s): Serwin, R.E.
• Application Number:
  US05/613,275
• Time in Patent Office: 603 Days
• Field of Search: 23/230 R, 23/253 R, 23/259, 73/425.4 R
• US Class Current: 436/52
• CPC Class Codes: G01N 35/085 Flow Injection Analysis
• CPC Class Codes: Y10T 436/117497 with a continuously flowing sample or carrier stream
• CPC Class Codes: Y10T 436/173845 Amine and quaternary ammonium

Abstract

A continuous flow analytical system in which there is provided a continuous unobstructed carrier stream into which discrete volumes of sample solutions to be observed for reaction with the carrier stream are injected successively. A detector for measuring the results of any reaction between the carrier stream and sample solutions is positioned downstream from the point of injection.

Claims

1. Method of continuous flow analysis of a liquid sample in a carrier stream, said method comprising the steps of:

forming said carrier stream as a continuous unobstructed flow of liquid in a tube, said flow being turbulent at a predetermined station within said tube and

injecting said sample through a wall of said tube into said stream as a discrete volume at or upstream from said station.

2. Method as defined in claim 1 wherein said step of injecting is carried out at a rate in excess of about 3 ml/min. for not more than about 20 seconds.

3. The method as defined in claim 1 including the step of pumping said stream past said station, said carrier stream being pumped so rapidly and said stream being of such small cross section area that the flow of said stream, at least in the portion thereof beyond said station, is turbulent.

4. Method as defined in claim 3 including the step of detecting, downstream of said station, results of reaction between said carrier and said sample.

5. Method as defined in claim 4 wherein said carrier stream is formed to contain chemical compounds intended to react with said sample so as to provide a change in the optical density of said carrier stream at a position downstream of said station.

6. Method as defined in claim 4 wherein said carrier stream is formed to contain chemical compounds intended to react with said samples so as to provide reaction products which can be continuously monitored by an electrochemical sensor.

7. Apparatus for continuous analysis of a sample solution in a carrier stream, said apparatus comprising in combination;

means providing a continuous unobstructed liquid carrier stream;

a flexible walled tubular conduit;

means for pumping liquid from said source through said conduit so that the flow through at least a portion of the latter is substantially turbulent; and

means for injecting a predetermined volume of said sample solution through a wall of said flexible conduit and into the carrier stream within said conduit upstream of or in said turbulent flow.

8. Apparatus as defined in claim 7 including means for detecting the results of reaction between said carrier stream and said sample solution at a position downstream from the point of injection of said sample solution.

9. Apparatus as defined in claim 8 wherein said means for injecting comprises a cannulus adapted to pierce said wall, and means for expressing said volume of sample solution through said cannulus and into the interior of said tube.