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ilen af Saltsyre dekoinponerbäre Del er af en meget
forskjellig Størrelse. For uhindret at kunne betragte de
egentlige Ler-Bestanddeles Forhold ligeoverfor Saltsyre, undlader
jeg foreløbig at tage Hensyn til den kulsure Kalk, og har
derfor i den følgende Tabel bragt denne Substans
tilligemed Griødningstabet i Fradrag og beregnet de øvrige
opløselige Bestanddele som Procenter af et kalkfrit Ler. I
den nederste Dei af Tabellen har jeg opfort de paa samme
Maade fundne Værdier for Lerets samlede Bestanddele.
Ved Betragtning af denne Tabel kan det synes
paafaldende. at de forskjellige Bundprøver viser en saa stor
Uoverensstemmelse med Hensyn til den af Saltsyre
dekom-pouerbare Del. medens de Tal. der udtrykker Lerets
samlede Bestanddele, tyder paa en nogenlunde ensartet
Sammensætning. Hertil maa imidlertid bemærkes, at
Behandlingen med Saltsyre ikke kan give noget synderlig
værdifuldt Resultat til Sammenligning af de forskjellige Slam-
51 . 52 178 205 214 240 245 2 95 301 302 306 351
FeO 2.6 1.9 2.2 2.1 2.6 2.0 1.6 1.9 1.4 1.6 1.3 1.7
Fe,Ö.} 6.3 7.7 3-9 7-2 6.3 6.9 7.0 5.3 5.7 3.4 5-9’ 5-6
ALO3 15-0 1-2 8.1 5.9 6.7 7.7 8.5 13.8 4.3 4.4 2.9 4.6
Mg O 2.1 1.7 3.3 4-0 3-5 °-9 3-5 i>3 l-8 2-4 2.2 2.9
Si02 21.6 9.1 11.1 14.6 15.i 19.6 14.8 5.7 ’ 8.0 10.2
Sum 47.6 27.6 28.6 33.8 34.1’ 37.1 37.1 18.9 20.3 25.0
FeO 2.6 1.9 2.5 2.0 1.6 1.9 1.4 1.4 1.7
FeOs 10.0 11.o 9.8 11.3 12.9 8.2 8.7 8.6 9.1
ALO3 25.4 21.0 20.C) 19.7 24.1 29.3 21.5 18.9 23.2
MgO 3.3 . 1.1 3-5 1-5 3-4 2.5 2.5 2.7 2.8
SiOo 57.6 63.7 63.7 61.61 57.7 59.1 ’64.7 68.3 63.8
Sum 98.9 98.7 99-5 96-1 99-5 IOI-° 98.8 99.9 100.6
prøvers kemiske Sammensætning. Saltsyrens opløsende
Virkning maa nemlig i høi Grad være afhængig af den Finhed,
hvori Slammet befinder sig, og denne er. som forud nævnt,
ingenlunde den samme i de forskjellige Partier af
Biloculinleret. Denne Uensartethed træder tydelig frem. naar
man betragter de forskjellige Prover under Mikroskopet,
og det Resultat man erholder ved Behandlingen med
Saltsyre kan nærmest tjene til at belyse det samme
Forhold.1 Det viste sig saaledes, at Bundprøverne fra
Ståt. 301, 302 og 306. der i Særdeleshed udmærker sig
ved låve Tal for de opløselige Bestanddele, ogsaa indeholdt
flere grovere Partikler end de øvrige. Som vi strax i det
1 Finheden har ikke været afhængig af Pul viseringen af de
tørrede Bundpröver, da jeg altid har sørget for at udfore denne
Operation saaledes, at Lerets Partikler derved ikke kunde lide nogen
Forandring i sin oprindelige Størrelse.
in hydrochloric acid is seen to differ very considerably in
the foregoing analyses. With a view to investigate with
greater freedom the effect of hydrochloric acid on the
constituents of the true clay, no regard has now been had
to the carbonate of lime, and therefore that substance,
together with the loss by ignition, has accordingly in the
following Table been subtracted from the remaining
decomposable parts, which are computed as percentages of a clay
exhibiting 110 trace of lime. The lower columns of the
Table show the values, found in like manner, for the
united Constituents of the deposit.
On examining this Table, it may seem strange that
the various samples should exhibit very considerable
disagreement as regards the proportion decomposable in
hydrochloric acid, while the figures denoting the united
constituents indicate a comparatively homogeneous
composition. To this objection must however be replied, that the
treatment with hydrochloric acid cannot give a
particularly valuable result for estimating the chemical composition
of the different samples of deposit. The decomposing effect
of hydrochloric acid must then depend to a great
extent on the relative fineness, of the deposit, which, as
previously stated, is anything but constant in Biloculina clay.
With the aid of the microscope, this want of uniformity is
distinctly perceptible, and the result obtained by treating
with hydrochloric acid is principally of value in
illustrating the same subject.1 The samples from Stations 301,
302, and 306. distinguished in particular by their small
proportion of decomposable constituents, were found to
contain a greater number of coarse particles than the others.
Moreover, these samples, as will shortly appear, are in an-
1 The fineness of the deposit was not the result of the
trituration of the dried samples, since I invariably sought to perform this
operation in such manner as to preserve the particles of clay from
undergoing any change in magnitude.
Samledo Dekomponeret af
Bestanddele. Saltsyre.
United Decomposed by
Constituents. Hydrochloric Acid.
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