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II. Om Kulsyren i Søvandet.
Af alle cle Chemikere. som før den tyske
Pomerania-expedition i 1872 anstillede Undersøgelser over Luften
i Søvandet, blev der foruden Bestemmelser af
Surstof-Kvælstofmængden ogsaa samtidig udført Maalinger af den
under Udkogningen uddrevne Kulsyre, og de Qvantiteter,
man paa’denne Maade fandt, bleve ogsaa bestandig opførte
blandt Resultaterne som ’ den samlede Mængde Kulsyre,
der var opløst i Søvandet enten fri som Gasart eller
bunden til Carbonater som sure Salte. De Resultater. • som ad
denne Vei erholdtes, vise imidlertid bestandig overmaade
store Uoverensstemmelser ikke alene mellem de forskjellige
Forfattere men ogsaa mellem cle enkelte Observationer hos
en og samme Experimentator. hvor man dog maatte have
antaget, at en større Ensartethed i Forsøgenes Udførelse
skulde have udjevnet Differentserne.
Som Exempel paa, hvor vidt Uoverensstemmelserne
i de ældre Opgaver strække sig. kan anføres Følgende:
I en Liter Overfladevand fandt
Fremy.........2.2 til 2.8 CC. Kulsyre K
Morren.........1.6 „ 3.9 — — 2.
Lewy.........2.4 „ 3.9 — — 3.
Pisani.........6.0 „ 8.1 — — 4.
Hunter.........0.8 „ 5.9 — — t 5.
Desuden fandtes efter en noget anden
Fremgangsmaade af
Bischof...........39.0 CC. 6>
Vogel.........55.6 til 116.3 — 7.
Ved alle disse ældre Undersøgelser, hvor der ved
Udlægningerne var anvendt fuldt Atmosphæretryk, og hvor
1 Compt, reneli 6—616.
2 Ann. Chim. Phys. [3] — 12 — .">.
8Ann. — — [3] — 17. Ann. Chera. Pharm. 58 — 328.
4 Compt. rend. 41 — 532.
6 Jahresbericht 1869 — 1279.
0 Chem. Geologie 1 Anfl. 2 1130.
7 Schweigg. Journ. S — 351.
II. On the Carbonic Acid in
Sea-water.
The several chemists who. previous to the German
’Pom-erania’ Expedition (1872), had instituted observations
on the air present in sea-water, when measuring the amount
of the oxygen and nitrogen also collected the carbonic acid
driven off during the process of boiling; and the quantities
determined were invariably set clown among the results as
the total amount of carbonic acid actually existing in the
water, either free as gas or contained, to a less extent, also in
bicarbonates. The results thus attained vary however to a
remarkable extent, and not only as between the different
experimentalists individually, — the like is also the case with
the observations of one and the same person, although
greater ’ uniformity in the mode of operation should
apparently have tended to eliminate error.
The following Table will show the wide difference
prevailing between the formulae of early authors.
Amount of Carbonic Acicl in 1 Litre of Surface-water.
Fremy............2.2 to 2.8 CO.
Morren............1.6 „ 3.9 — 2.
Lewy.............2.4 ,, 3.9 — 3.
Pisani............6.0 „ 8.1 — 4.
Hunter .......•.....0.8 5.9 — 5.
The proportion as found by a somewhat different
process was as ’follows
Bischof.............39.0 CC..G.
Vogel...........55.6 to 116.3 — 7.
Hence, it appears that the quantity of carbonic acid
given off under these early experiments, for which the boil-
1 Compt. rend, (i, p. 616.
2 Ann. Chim. Phys. [31 12, p. ."».
— [3] 17i Ann. Chem. Pharm. .">:■>, p. 328.
4 Compt, rend. 41, p. 532. •
6 Liebigs .Tahrbericht 1.869, p. 1279.
•Chem. Geologie 1 Aufl. 2, p. 1130.
7 Schweigg. Journ. S, p. 351.
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