Crack the Nitrogen purity test valve,
open the stop-cock 'G', adjust the gas flow and allow the sample gas to
bubble through the purging vessel for one or two minutes. Check that the
burette, the reaction chamber and the test connection tube are completely
filled with water. Turn the stop-cock open to the burette connection. Then
slowly open the cock 'H' to allow the oxygen to pass into the burette (not
the reacting chamber), controlling the nitrogen flow. When the burette is
filled below the bottom mark, close the stop - cocks 'G' and 'H' and
disconnect the nitrogen sample tube , close the test valve.
Adjust the level of the gas in the burette to the 100 cc mark by holding
the leveling bottle at the level of the water in the burette and carefully
opening the cocks 'G' & "H' to bubble through the purging vessel to
1. When first passed into the burette, the Nitrogen sample will be colder
than the room temperature and will expand as it warms. Therefore, the sample
should be allowed to warm to room temperature for several minutes before the
level is adjusted to the zero mark. Pass the gas sample into the reaction
chamber by turning the burette stop cock 'H' to connect it to the reaction
chamber, then raising the leveling bottle. Close the stop cock, replace the
leveling bottle in the holder and allow the oxygen in the sample to react
with the phosphorus. The reaction results in the emission of the white smoke
consisting of phosphorus pent oxide dissolve in water to form phosphoric
acid. When reaction is complete, as indicated by smoke ceasing to emit, open
the cock and lower the leveling bottle to pass the unabsorbed gas from the
reacting tube into the burette, pinch the rubber tube to ensure no bubbles
are trapped in it. Level the liquid in the burette and the leveling bottle
and note the reading indicated on the burette scale at the liquid level.
This reading is equal to percentage of purity of the original Nitrogen
2. The gas sample may be warm due to the reaction of the oxygen purity with
phosphorus. Allow it cool to room temperature for several minutes before
adjusting the level to the zero mark.
Industrial Plants Manufacturing Co.(P) Ltd.
Mr. Sanjiv Agrawal
A-104/2, Okhla Industrial Area, Phase - II
New Delhi - 110 020, Delhi, India
Universal Industrial Plants Manufacturing Co.(P) Ltd.
Developed and Managed by IndiaMART