Carbon Monoxide Detector Tube

Carbon Monoxide Pass 1050 50 mL of sample gas through a carbon monoxide detector tube at the rate specified for the tube. The indicator change corresponds to not more than 10 ppm, by volume. 

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After combustion of the sample and carriers in an oxygen stream, reducing conditions are achieved by a flow of carbon monoxide over the sample ash. Arsenic, zinc, cadmium, and any remaining selenium and mercury are reduced to elemental form. When the sample is heated to 1150°C in a slow carbon monoxide stream in a quartz tube in a furnace, recovery of all five elements in the liquid nitrogen trap is complete in 30 min. The recovery trap is washed with nitric acid to dissolve all the metals, and the radioactivity of a nitric acid solution of the products is counted with a Ge(Li) detector. 

The reactor tube was brought to the required temperature under an atmosphere of argon. A mixture of nitric oxide and carbon monoxide or hydrogen, diluted by argon was then introduced into the reacting part of the quartz tube. The gaseous reaction products were intermittently withdrawn from the reactor and analyzed by a chemiluminescent NOx analyzer and a gaschromatograph. Ammonia was measured by detector tube method. The scope of the experiment is shown in Table II. 

Calibration gases and equipment Carbon monoxide monitors and detectors Detector tubes... 

On-line analysis of the effluent gases was conducted using a gas chromatograph (Hewlett Packard model 5890 Series H), equipped with FID and TCD detectors. A DB-624 fused silica capillary column was used for the hydrocarbon separation. The carbon monoxide and carbon dioxide were separated using molecular sieves (5A) and Hayesep R columns. Tlie effluent gases were analyzed for the unconverted VOCs, partial oxidation products such as chloroform and 1,1,2-trichlorocthanc, and total oxidation products (CO and COj). The HO and Clj analysis was performed using Drager tubes. The total conversion is based on total cartoon atoms in the feed. 

Carbon monoxide may be determined over a wide range of concentration via infrared analysis [25]. Good results are achieved at concentrations as low as 1.25 to 2.5 mg m . The main disadvantage of this technique is the non-linear response, as well as possible interference by CO2, water vapour and hydrocarbons. The use of the gas chromatography for determining CO includes a catalytic reduction system, which converts carbon monoxide quantitatively to methane and a flame ionization detector. For a rapid CO determination, indicator tubes with palladium salt as a catalyst and silicomolybdate complex, which yields a blue colour with carbon monoxide, are used. The CO determination can also be carried out on the basis of its reaction with the radioactive kryptonate of palladium chloride [18, 25]. 

Relatively inexpensive portable colorimetric indicators are now commonly used to detect the presence of a variety of contaminant gases in the atmosphere. These are normally specific for one or perhaps a series of gases. For example, the NBS colorimetric detector uses an indicator tube that contains a 15-mm section of yellow palladous silico-molybdate gel the gel changes color when exposed to carbon monoxide at concentrations as low as 0.001 vol. % in air. Figure 52 shows one version of a commercial unit used for carbon monoxide as well as carbon dioxide, the unsaturated hydrocarbons, and a variety of other gases this unit can also be used to determine the approximate concentrations of contaminants in liquid oxygen. Precise determinations can be made with a variety of analytical tools, including infrared... 

Detactor tubes—are probably, the simplest (and least accurate) of the direct reading instruments. The detector tubes are often referred to by the name of their manufacturer, such as Drager or Sensidyne tubes. The detector tube is hermetically sealed at both ends and filled with a granular or powdery reagent. Each tube is specific for a particular gas or vapor, hence tubes for ammonia detection are different from the tubes for carbon monoxide or methane detection. Each tube has printed on it s surface the name of the chemical it is specifically designed to test for. 

As in the case of any flammable gas, never use a flame in trying to detect carbon monoxide leaks. Portable detection equipment or the formation of bubbles by a soapy solution applied to a suspected area will indicate leaks. Carbon monoxide alarm detectors must be installed in all indoor areas in which the gas is regularly used in more than small laboratory amounts. Colorimetric sniffer tubes are also utilized for detection of carbon monoxide. Samples of atmospheric air containing carbon monoxide are aspirated through such tubes. 

Buming-type (decomposition or combustion products) PID, carbon monoxide nitrogen oxides —detector tubes or dedicated monitors... 

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