Meddelelser om Grønland . pparatus of this determination was made twice witheach sample of water. A recipient {bon the adjoined figure) of 225 capacity,provided with two stopcocks, was there-upon filled with the water; care beingtaken to avoid loss or absorption of car-bonic acid. This recipient was connectedwith the ordinary recipient a of the mer-cury-pump containing 10 cc. ofdecinormalmuriatic acid. When this had been evacua-ted the tap ? was opened, and the gas nowliberated pumped out and collected. Thequantity of carbonic acid in the collectedgases was determined by analysis,
Meddelelser om Grønland . pparatus of this determination was made twice witheach sample of water. A recipient {bon the adjoined figure) of 225 capacity,provided with two stopcocks, was there-upon filled with the water; care beingtaken to avoid loss or absorption of car-bonic acid. This recipient was connectedwith the ordinary recipient a of the mer-cury-pump containing 10 cc. ofdecinormalmuriatic acid. When this had been evacua-ted the tap ? was opened, and the gas nowliberated pumped out and collected. Thequantity of carbonic acid in the collectedgases was determined by analysis, andthe mixture of seawater and muriatic acid ^ was titrated with baryta for the determination of the alkalinity. The alkalinity was found to be remarkably low, viz. ^4 == of COg per 1. and 1 thouglit at first that I must have com-mitted an error in the determination. A repeated determinationof the normal acid, according to the extremely accurate methoddescribed by Sørensen ^), and a revision of the whole method. ^) Ueber die Anwendung des normalen Natriumoxalats in der Massanalyse».Fresenius Zeitschr. f. unalyt. Chemie Bd. 42 p. 333 and p. 512. 358 showed however that the result was substantially correct, and the following experiments will show that it is also in perfect agreement with theory. The following table gives the values for the tension 0, the total quantity of CO« present in 1 1. of the water i?, the quantity of free carbonic acid d^ the quantity of carbonic acid combined with the alkali ? — d = ß, the difference between this quantity and the alkalinity or, in other words, the quantity of CO^ combined to form bicarbonates/9 — A = ij, and, finally, ß B^) the saturation proper ^, and the approximate saturation -^ . /? Fi ^ and -J are given in the adjoined curves. Tension Total CO, Free CO J ? —d^ ß-A = Saturation ßA Approxim. ? ? d ? A 14
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