. Bulletin . e at normal temperature and pressure, so the c. c. of water remaining on the inside of these containers should absorb about c. c. of carbon dioxide at normal pressure. The partial pressure of the carbon dioxide was , or 4 mm. The amount of 4X0 7carbon dioxide absorbed by the water becomes then 1^ — c. c, or per cent of the entire quantity of the gas sample. 6 SAMPLING AND EXAMINATION OF GASES This is within the error of making the analysis ( per cent) ;hence the appreciable loss of carbon dioxide noted above must havebeen due to some other cause
. Bulletin . e at normal temperature and pressure, so the c. c. of water remaining on the inside of these containers should absorb about c. c. of carbon dioxide at normal pressure. The partial pressure of the carbon dioxide was , or 4 mm. The amount of 4X0 7carbon dioxide absorbed by the water becomes then 1^ — c. c, or per cent of the entire quantity of the gas sample. 6 SAMPLING AND EXAMINATION OF GASES This is within the error of making the analysis ( per cent) ;hence the appreciable loss of carbon dioxide noted above must havebeen due to some other cause than absorption of carbon dioxideby water. It is probable that absorption of carbon dioxide in thealkali dissolved out of the glass by the water was has called attention to the absorption of carbon dioxideby alkali dissolved out of glass by water, and has pointed out thatin a wet, dirty bottle an appreciable amount of carbon dioxide mayappear and oxygen may disappear by bacterial Figure 2.—Glass lubes for tailing samples by water displacement PROCEDURE FOR SAMPLING Figure 2 shows twelve 250-c. c. glass sampling tubes assembledin a box. Before a sample of the gas is taken fill the tubes withwater. Pinch clamps over short pieces of rubber tubing, make thetubes gas-tight, connect the upper end with the place where a sampleof gas is to be taken, and open the pinch clamps; the water thenflows out and draws in the sample of gas. Wlien all of the waterhas run out, close the j^inch clamps, and the samj)le is ready foranalysis. Analyze samples taken by this method as soon as possible,because rubber tubing is not impervious to gases when left over a ^ Ualdane, J. S., Methods of air analysis. 1912, p. 3. DETERMINATION OF MOISTURE 7 long iDeriod. The box serves as a convenient means of carryingthe sample containers to and from the laboratory. Each tube inthe box is protected by strips of felt, and when the box is closedeach is held firmly in place. CHECKING
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