Lerrs anp Buakr—Lstimation of Oxygen in Solution. 463 
Gasometric Analysis. 
200 c.c. of the water gave— Equivalent to, per litre— 
CO; 5 70H CC: 3 ; A ; 5 BOYD CXC. 
On oc Se ans itl oc: Nair asan ss 
IN Gy ae ear Te Aeron ewes Go LEIS a) 
Total, 10-91 ,, A ely de Se Soles 
Dissolved oxygen, per litre, by new process, . , SO Ge. 
by gasometric analysis, 5°75 ,, 
Difference, ; 5 ODE 5 
2? 9? 9 
Sewage Effuent from Belfast experimental “ Bacteria Beds” 
after double contact, and subsequent exposure in pond for one 
hour.—(Titrations by permanganate 1 cc. = 1 ce. oxygen 
atoNe wt. Po) 
A. Blank experiment required, : : 5 40S C0, 
Oxygen determination required, . ‘ 5 OPIS ae 
0:90 ,, 
. B. Blank experiment required, : ‘ =~ 4:05ie.e: 
Oxygen determination required, . ‘ 4 BPS 6 
0:90 ,, 
Dissolved oxygen = 0°90 c.c. 
Gasometric Analysis. 
200 c.c. of the effluent gave— Equivalent to, per litre— 
CO, . 25:04 c.c. f j ) : 125°20 c.c. 
Os ee Os6ou : ; : ‘ Sols” 
ING ei or OO ie ; : ; é 14°35 _ ,, 
Rotale2 S040. : : ; : 142:70 ,, 
Dissolved oxygen, per litre, by new process, . 5 Ded Ces 
” ” ” by gasometric analysis, 3°15 ,, 
Difference, .- : . 0-44 ,, 
1The weaker solution was also tried but did not work well, the end coloration 
fading too rapidly for accurate observation. 
