Journal . is described :—The burette (as previously described by the author,J. Irakt. Chem. 35, 259) is connected on the one sidewith the pressure flask B, on the other with the combustionvessel ec, and the pear-shaped vessel A, the last beingconnected with C ; cc contains a piece of platinum foilwhich can bo heated to a white heat by two Bunsen process of analysis is first to absorb the carbon dioxidewith caustic potash solution, next the by meansof an alkaline solution of pyrogallol, and then to determinethe marsh gas bypassing it through the combustion, tubeuntil
Journal . is described :—The burette (as previously described by the author,J. Irakt. Chem. 35, 259) is connected on the one sidewith the pressure flask B, on the other with the combustionvessel ec, and the pear-shaped vessel A, the last beingconnected with C ; cc contains a piece of platinum foilwhich can bo heated to a white heat by two Bunsen process of analysis is first to absorb the carbon dioxidewith caustic potash solution, next the by meansof an alkaline solution of pyrogallol, and then to determinethe marsh gas bypassing it through the combustion, tubeuntil it is completely burned; the nitrogen is taken bydifference. To collect the sample the burette is filled withwater, taken to the working, and the taps o, b, and copened; as soon as the last drop of water has run out thetaps are closed. The burette is then placed in a vessel ofwater which has attained the temperature of the room (the 216 THE JOURNAL OF THE SOOIETT OF INDUSTRY. [March »i. borette being held in the reversed position to that in thefigure) and the taps 6 and c opened, and b quickly closedagain when the burette is filled with gas (100 cc.) at thetemperature and pressure of the room. To determine thecarbon dioxide the cap ca is removed, and the reservoirbetween a and b filled with caustic potash solution. Thecap c is then introduced, and b is opened when the liquidenters the burette, where it is well mixed with the gas by-shaking ; by holding the burette in a horizontal positionthe alkali is allowed to flow into the reservoir, whence itis poured away and replaced by water in a similar mannerto the above. After washing the gas the burette is againplaced in a vessel of water, the tap b opened, and thevolume of gas read off; the absorption represents thepercentage of carbon dioxide. Similarly the oxygen isabsorbed by an alk;dine solution of pyrogallol. To bumthe marsh gas the burette is fixed as shown in the water is replaced by air or oxy
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
