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13	13	To determine the amount of chalk (CaCO,,3,,) present in a soil sample one needs to use hydrochloric acid (10% HCl) and drip this on the sample. The amount of fizzing is the indication for the amount of chalk present. One must take into consideration that the fizzing is also determined by the speed of the hydrochloric acid in the sediment. For example: sand will give a quicker and more violent fizzing than clay, but clay will fizz for a longer time.
14	14
15	15
16		-**Amount of calcium**
	16	+== **Amount of calcium** ==
17	17
18	18	(% class="table-hover" %)
19	19	|=(((
...	...	@@ -29,29 +29,9 @@
29	29	|Calcareous|Audible fizzing and  less visible, about 2% CaCO,,3,,
30	30	|Calcium rich|Visible fizzing, more than 1 or 2% CaCO,,3,,
31	31
32		-= See also =
33		-
34		-Color
35		-
36		-Consistency
37		-
38		-Odor
39		-
40		-Oil/water reaction
41		-
42		-Sampling methods
43		-
44		-Soil boundaries
45		-
46		-Sorting
47		-
48		-Spot gradation
49		-
50		-Tensile strength
51		-
52	52	= References =
53	53
54		-* Yet to be added
	34	+* NEN-EN-ISO 14688-1:2019
55	55	)))
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57	57