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1 ’l
gjøre Fordring paa nogen Nøiagtighed, viser den ialfald, at
Forskellighederne i Vandets speciliske Vægt i Forening
med Feilene ved de enkelte Analyser er tilstrækkelige, til
at forklare de Heste Afvigelser i de fundne
Magnesiamæng-der. De Uoverensstemmelser, der ikke kan udtydes paa
denne Maade, er (ligesom ved Kalken) saa smaa og
uregelmæssige, at der ikke kan tillægges dem nogen afgjørende
Beviskraft.
Forat bedømme de Tal. der er fundne for Svovlsyren,
maa man tage de sannne Hensyn til Vandets speciliske
Vægt som ved Magnesia. Men der maa tillige bemærkes,
at Svovlsyrebestemmelserne er i Besiddelse af en langt
større Paalidelighed, da Feilene ved de enkelte Analyser,
saaledes som Kontrolforsøgene viser neppe overstiger 0.002
pCt. De største Afvigelser i de fundne Svovlsyremængder
er 0.2160 og 0.2273 pCt. i to Vandprøver, hvis specitiske
Vægt var 1.0263 og 1.0268. Omend disse Differentser for
en Del kan skyldes dé tilsvarende Forskjelligheder i
Egenvægten, er de dog for betydelige til. at denne Forklaring
kan være tilstrækkelig. Desuden tindes dér ogsaa nogle
Vandprøver af samme specitiske Vægt, der i
Svovl’syrege-lialten differerer 0.005—0.006 pCt., hvilket er formeget til
at kunne. betragtes som Feil i Analysen. Skjønt disse
Uoverensssemmelser, der kun forekommer paa nogle faa
Punkter, er endnu ubetydeligere end ved Magnesia, bliver
de dog vanskeligere at forklare paa Grund af
Bestemmelsernes større Paalidelighed.
Forat betragte dette og de foregaaende Spørgsmaal
fra forskjellige Sider har jeg i den følgende Tabel opstillet
Middeltallene for Kalk. Magnesia. Svovlsyre og Klor i
Overfladen, Bunden og de mellemliggende Dyb. Jeg har
tillige udregnet disse Bestanddele^ Forhold til hinanden
ved at sætte Klor eller Svovlsyre = 100.
with no pretensions to accuracy, will at all events show,
that differences in specific gravity and errors of analysis
generally suffice to account for the want of agreement in
the computed amounts of magnesia: and when, as is the
case with the lime, this cannot be so explained, the
variation is alike too slight and too irregular to admit of its
possessing any real demonstrative power.
When estimating the accuracy of the figures found
for the sulphuric acid, no less regard must be had to the
specific gravity of the water than with magnesia. It must
also, however, be borne in mind, that the sulphuric acid
determinations are distinguished by a far higher degree of
accuracy, the errors of analysis scarcely exceeding 0.002
per cent.- The most considerable differences in the results
for sulphuric acid — computed from two samples of water,
specific gravity respectively 1.0263 and 1.0268 — amount
to 0.2160 and 0.2273 per cent. True, this diversity can
be partly ascribed to a corresponding deviation in specific
gravity; but they åre much too considerable to be thus
accounted for. Besides, some of the samples with the
same specific gravity differ in their proportion of sulphuric
acid to the extent of 0.005, or 0.006 per cent. — too
considerably, therefore, for the discrepancy to be regarded as
a mere error of analysis. This want of agreement.’ though
referring to water from a few localities only, and less
considerable even than that in magnesia, is nevertheless
difficult to explain, by reason of the greater accuracy of
the determinations.
With a view to the better apprehension of this and
the foregoing questions, I have tabulated the mean amounts
of lime, magnesia, sulphuric acid, and chlorine in water from
the surface, from intermediate depths, and from the
bottom. I have likewise estimated the relative proportion of
these compounds, with 100 equivalents of chlorine or
sulphuric acid as the standard of computation.
[-Overfill-]
{+Over- fill+} (len. Bunden. [-Melleiy-liggende-] {+Melleiy- liggende+} Dyb. [-(rjennem-snits–] {+(rjennem- snits-+} • gehalt for ’hele Havet. Surface. Bottom. Inter. Denths. 3Ioay Value.
Middeltal for CI. . . . I.930 1-933 1-934 1-932 Mean Value Chlorine 1.930 >•933 1-934 1-932
— - Egenvægt 1.0265 1.0265 1.0266 1.0265 „ „ Sp.Gravity 1.0265 1.0265 1.0266 1.0265
— - CaO . . 0.0576 0.0581 0-0577 0.0578 „ CaO . . 0.0576 0.0581 0.0577 0.0578
- MgO . . 0.2205 0.2207 0.2200 0.2203 „ MgO . . 0.2205 O.2207 0.2200 0.2203
. — - so3.. . 0.22 I I 0.2208 0.2223 O.2214 ,. SO,. . . 0.22 1 I 0.2208 0.2223 0.2214
CaO : Cl (CI = 100). . 2.98 3.01 2.98 2-99 CaO : Cl (Cl = 100). . 2.98 3.01 2.98 2.99
MgO : Cl........ I I.42 H.42 11-37 11.40 MgO : (’l........ I 1.42 11.42 ti-37 11.40
S03:C1......... I 1.46 11.42 11.49 11.46 SO, : Cl......... 11.46 11.42 11.49 11.46
CaO : SO, (SO,= 100) 26.05 26.32 25-95 26.1 I CaO : SO, (SO, — 100) 26.05 26.32 25-95 26.11
MgO : SO ;....... 99-73 99-95 98.96 99-55 MgO : SO,....... 99-73 99-95 98.96 99-55
Som der vil sees af den sidste Tabel, afviger
Middeltallene for Kalk og Magnesia saa yderst ubetydelig fra
hinanden, at disse Vacationer ganske kan sættes ud af
Betragtning.
As appears from the Table, the mean values for lime
and magnesia vary so inconsiderably inter se that we may
safely disregard these differences.
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