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76 GENERAL AND PHYSICO-CHEMICAL.
for the electrometric determination of reaction in fluids containing
carbon dioxide. By the aid of this method Hasselbach and Lunds-
gaard l
have made determinations of the reaction of the blood. From
these it follows that at a temperature of 38.5° C. where the value for
pH = 6.78 corresponds to the neutral reaction the figure obtained for pn
with defibrinated ox-blood was 7.36 showing therefore a slight alkaline
reaction. The influence of the respiratory variation in the CO2 tension
upon the H ion concentration of the blood is of a measurable size.
The total blood has a greater H ion concentration than the serum at
equal CO2 tension but less than the blood corpuscles. For human blood
saturated with CO2 under 40 mm. tension at 38° C. Lundsgaaed 2
found pH = 7.19. Michaelis and Davidoff 3
found the average values
of normal venous blood for pH = 7.35 at 37.5° C.
1
Biochem. Zeitschr., 38, 77 (1911).
2 Ibid., 41, 2641(1912).
3 Ibid., 46, 131 (1912)..
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