INDUSTRIAL AND ENGINEERING CHEMISTRY
498
TaBLE Trial No. 17 26
34 40
v7.
RESULTS WITH ABRAHNCZIKTUBES &‘HICH HAD STOOD IDLEFOR 12 HOVRS
When Analyzed E n d of day Next morning Endof day Next morning E n d of d a y Next morning End of day, Next morning
Found Carbon Hydrogen
Calculated Carbon Hydrogen
9%
%
%
n /C
81 15 81.01 82 90
10 55 10 45 12 13 12 2 1 10.14 10.10 4.40
81 1.5
10 50
82 94
12 03
81.00
10 11
80.78
4.35
82.99 80.94 80.98 60.82 60 80
4 50
TABLE VI. PERFORMAKCE O F ~4BRAH.~?,ICZIKTUBES AFTER STANDISG 96 HOERS Trial NO. 22 30
52
Found Hydrogen %, 80,86 10.16 SO. 77 10.30
Carbon
sc
82.26 S2,16 S O , 94 80 98
Calculated Carbon Hydrogen %, 5 8 0 , s5 10 l i
9.93 9.78
82.21
9.90
10.19 10 29
80 8.5
10 17
Conclusions This investigation shows that the Abrahamczik absorption tubes, with minor structural changes, compare favorably with those of the Pregl type in accuracy and reproducibility of results, ease of handling and filling, and capacity for the absorption of carbon dioxide and water. I n addition, they have the following advantages over the Pregl tubes: High atmospheric humidity has no effect upon the results obtained and corrections for humidity need not be applied. Since the Abrahamceik tubes are not vigorously wiped prior to weighing, the effect of static charges due to low humidity is entirely eliminated. While this advantage does not come
VOL. 12. NO. 8
from the design of the tube, i t is brought about b y Abrahamczik’s procedure. The Pregl tubes could probably be wiped in a similar manner Kith equally good results. Because the Abrahamczik tubes are weighed while filled with oxygen, it is not necessary to flush the system with air, as in the Pregl procedure. This not only effects a sa\
