| 摘要 |
1,000,326. Determining relative amounts of fluid mixture constituents. BECKMAN INSTRUMENTS Inc. Oct. 4, 1963 [Oct. 26, 1962], No. 39109/63. Heading G1N. In an apparatus for determining the amount of an oxidising species, in a sample gas stream by reacting the species with a halide solution so as to generate free halogen and then determining the free halogen in an electrochemical cell with simultaneous reduction of the halogen, the apparatus comprises a substantially closed conduit portion 10,11 for allowing a halide solution to circulate therein having spaced entry and exit openings 22, 24, which permit of the species within the gas reacting with the halogen and setting the solution in circulation by bubble lift 18, electrodes 38 and 42 being provided in a portion of the vessel other than that through which the gas passes to generate a current indicative of the rate at which the species enters the cell and to reduce the free halogen in the solution. The cathode in tube 10 comprises a rolled platinum screen 38 connected by a platinum wire 39 to a fused terminal wire 40, and the anode is housed in a bottle shaped compartment 14 and comprises a loosely scrolled platinum screen 44, attached to a fused in wire 42 and substantially embedded in a paste of active carbon; the portion of the screen emerging from the carbon permitting the escape of hydrogen. A gas liquid separation compartment 24 is provided at the top of the column, the upper end of the compartment being connected to a flowmeter 28 and an aspirator 30. Make up of evaporated water is achieved by a wide reservoir 32 communicating through several feet of a small diameter flexible plastic tubing which prevents diffusion of salts from the cell. The apparatus may be used to monitor Halogen itself, or chlorine in conjunction with a bromide electrolyte, or reducing species or olefins may be carried in an ozone stream so that the depressed level of ozone which is indicated, is indicative of the reducing species or olefins. A silver screen anode may be used for high levels of ozone. |
