Calcium-carbonate sentence example

calcium-carbonate
  • There are, therefore, a number of agencies, all of which operate in shoal waters on the lee side of islands, or in shallow lagoons in such regions as the Bahamas, and the result of all these is to throw down calcium carbonate from solution in sea-water as minute needle-shaped crystals or little balls of aragonite.
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  • Obviously no more than this is possible until physiologists are able to state much more precisely than at present what is the influence of common salt on the plants of salt-marshes, of the action of calcium carbonate on plants of calcareous soils, and of the action of humous compounds on plants of fens and peat moors.
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  • Doubtless, the excess of any soluble mineral salt or salts interferes with the osmotic absorption of the roots; and although calcium carbonate is insoluble in pure water, it is slightly soluble in water containing carbon dioxide.
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  • However, until more is known of the exact chemical composition of naturalas contrasted with agriculturalsoils, and until more is known of the physiological effects of lime, it is impossible to decide the vexed question of the relation of limeloving and lime-shunning plants to the presence or absence of calcium carbonate in the soil.
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  • The Kassner process for the manufacture of oxygen depends upon the formation of calcium plumbate, Ca2Pb04, by heating a mixture of lime and litharge in a current of air, decomposing this substance into calcium carbonate and lead dioxide by heating in a current of carbon dioxide, and then decomposing these compounds with the evolution of carbon dioxide and oxygen by raising the temperature.
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  • When cryolite is used for the preparation of alum, it is mixed with calcium carbonate and heated.
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  • (4) Orthostannic acid is obtained as a white precipitate on the addition of sodium carbonate or the exact quantity of precipitated calcium carbonate to a solution of the chloride.
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  • Chalk consists, when quite pure, of calcium carbonate (CaC03), a white solid substance useful in small amounts as a plant foodmaterial, though in excess detrimental to growth.
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  • The material which chemists call calcium carbonate is met with in a comparatively pure state in chalk.
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  • Recent limestones are being produced in this way and also in some places by the precipitation of calcium carbonate by sodium or ammonium carbonate which has been carried into the sea or formed by organisms. The precipitated carbonate may agglomerate on mineral or organic grains which serve as nuclei, or it may form a sheet of hard deposit on the bottom as occurs in the Red Sea, off Florida, and round many coral islands in the Pacific. Only the sand and the finest-grained sediments of the shore zone are carried outwards over the continental shelf by the tides or by the reaction-currents along the bottom set up by on-shore winds.
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  • The most abundant of the terrigenous materials are the finest particles of clay and calcium carbonate as well as fragments derived from land vegetation, of which twigs, leaves, &c., may form a perceptible proportion as far as 200 m.
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  • The proportion of calcium carbonate varies greatly according to the amount of foraminifera and other calcareous organisms which it contains.
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  • When the proportion of calcium carbonate in the blue mud is considerable there results a calcareous ooze, which when found on the continental slope and in enclosed seas is largely composed of remains of deep-sea corals and bottom-living foraminif era, pelagic organisms including pteropods being less frequently represented.
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  • The bottom of the Black Sea is covered by a stiff blue mud in which Sir John Murray found much sulphide of iron,' grains or needles of pyrites making up nearly 50% of the deposit, and there are also grains of amorphous calcium carbonate evidently precipitated from the water.
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  • The whole collection of 231 specimens of deep-sea deposits brought back by the " Challenger " shows the following general relationship: Proportion of Calcium Carbonate in Deep-Sea Deposits.
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  • It is, however, a curious question how, considering the increase of carbonic acid by the decomposition of organic bodies and possible submarine exhalations of volcanic origin, the water has not in some places become saturated and a precipitate of amorphous calcium carbonate formed in the deepest water.
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  • It is infusible at temperatures up to 2000° C., but can be fused in the electric arc. When heated to temperature of 2 4 5° C. in a stream of chlorine gas it becomes incandescent, forming calcium chloride and liberating carbon, and it can also be made to burn in oxygen at a dull red heat, leaving behind a residue of calcium carbonate.
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  • The remaining mud of calcium carbonate and hydrate is washed, by decantation, with small instalments of hot water to recover at least part of the alkali diffused throughout it, but this process must not be continued too long or else some of the lime passes into solution.
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  • This mature weathering, resulting in the relatively complete separation of the quartz from the kaolin, and both from the calcium carbonate and other basic materials, implies conditions of rock decay comparable to those of the present time.
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  • - The normal salt is found native as the mineral magnesite, and in combination with calcium carbonate as dolomite, whilst hydromagnesite is a basic carbonate.
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  • C. Marignac has prepared it by the action of calcium carbonate on magnesium chloride.
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  • It is ordinarily prepared by the fermentation of sugar or starch, brought about by the addition of putrefying cheese, calcium carbonate being added to neutralize the acids formed in the process.
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  • This silt consists largely o alumina (about 48%) and calcium carbonate (18%) with smalle quantities of silica, oxide of iron and carbon.
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  • Primarily but a slight deposit is formed (none until the concentration arrives at specific gravity 1.0509), this deposit consisting for the most part of calcium carbonate and ferric oxide.
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  • The supply of materials containing naturally suitable proportions of calcium carbonate and clay being limited, attempts were made to produce artificial mixtures which would serve a similar end.
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  • Thus when hard limestone is the form of calcium carbonate locally available, it is ground dry and mixed with the correct proportion of clay also dried and ground.
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  • This limestone consists of calcium carbonate most intimately intermixed with very finely divided silica.
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  • The sodium sulphate is afterwards fluxed with calcium carbonate and coal, and a mixture is thus obtained from which sodium carbonate can be extracted by exhausting it with water.
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  • A number of secondary reactions, however, occur, owing partly to the excess of calcium carbonate and coal and partly to the impurities present, so that the solid product of the process, which is called " black-ash," has a somewhat complicated composition.
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  • Precipitated calcium carbonate may be used in place of the mercuric oxide, or a hypochlorite may be decomposed by a dilute mineral acid and the resulting solution distilled.
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  • If the SH 2 runs short they oxidize the sulphur again to sulphuric acid, which combines with any calcium carbonate present and forms sulphate again.
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  • Some of these cells produced muscles and connective tissue; others absorbed and removed waste products, iron salts, calcium carbonate and the like, and so were ready to be utilized for the deposition of pigment or of skeletal substance.
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  • On entering the first purifier, which contains calcium thiocarbonate and other combinations of calcium and sulphur in small quantity, the sulphuretted hydrogen and disulphide vapour have practically no action upon the material, but the carbon dioxide immediately attacks the calcium thiocarbonate, forming calcium carbonate with the production of carbon disulphide vapour, which is carried over with the gas into the second box.
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  • Some of them contain much iron (yellow, blue and red clays); others contain abundant calcium carbonate (calcareous clays and marls).
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  • This type is most commonly used and contains calcium carbonate.
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  • The hydroxide can then be reacted with carbon dioxide to form calcium carbonate.
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  • Also being launched on Stand 3344 will be the latest surface activated precipitated calcium carbonate from Longcliffe.
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  • Surface water carrying dissolved calcium carbonate has cemented these angular fragments together in many places forming a breccia.
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  • The analysis of the samples was very difficult because of high quantities of suspended calcium carbonate.
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  • The limestone is 90% pure calcium carbonate of a very high grade.
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  • Therefore the true concentration of the colloidal calcium carbonate is likely to have been 89 or 101 ppm as CaCO3.
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  • The decrease took so long because the free calcium carbonate in the soil was also dissolved by the acidification.
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  • Volcanic rock of high calcium carbonate underlies the western region; sedimentary sandstone occurs on the coastal flank.
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  • In geology, the cement of breccias and conglomerates is usually silica, iron oxides or calcite (mineral calcium carbonate ).
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  • Fresh deposits of calcium carbonate give the pools a dazzling white coating.
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  • Many corals have a hard exoskeleton made of calcium carbonate.
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  • Cholesterol-lowering effects of calcium carbonate in patients with mild to moderate hypercholesterolemia.
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  • The templates were used to grow surface microstructures by controlled crystallization of calcium carbonate by immersion in calcium chloride solution.
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  • The calcium carbonate skeletons gradually accumulate and the reef grows.
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  • A large amount of the fixed carbon is used by marine zooplankton to make calcium carbonate shells.
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  • It is infusible at temperatures up to 2000° C., but can be fused in the electric arc. When heated to temperature of 2 4 5° C. in a stream of chlorine gas it becomes incandescent, forming calcium chloride and liberating carbon, and it can also be made to burn in oxygen at a dull red heat, leaving behind a residue of calcium carbonate.
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  • It is made from septaria nodules which are dredged up on the Kent and Essex coasts and consist of about 60% of calcium carbonate mixed with clay, the mass being sufficiently indurated to remain coherent under water.
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  • After the separation of the silver salt (see above) obtained on sulphonating anthraquinone, the remaining acid liquid gives on treatment with calcium carbonate the calcium salt of anthraquinone 2.6 disulphonic acid (anthraquinone-a-disulphonic acid).
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  • Vinegar in fact contains acetic acid and this reacts with the calcium carbonate making up the shell of the egg.
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  • Daily dietary supplementation with 3 g of calcium carbonate may reduce the recurrence of adenomas.
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  • Natural pearls form inside mollusk shells and are a type of calcium carbonate.
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  • The soil there is well drained and full of calcium carbonate.
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  • Some individuals find that calcium carbonate causes stomach upset.
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  • Calcium Phosphate - Less common than either calcium carbonate or citrate, calcium phosphate is less expensive than calcium citrate and may not cause the stomach upset some people experience when taking calcium carbonate.
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  • While the FDA and the FTC have cracked down on spurious claims about coral calcium, the myth continues to prevail that it is a better source of calcium than the closely related calcium carbonate.
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  • In truth, it's pretty much on par with calcium carbonate although much more expensive.
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  • Coral calcium is actually a form of calcium carbonate, and calcium carbonate is what actually helps with bone health.
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  • If you choose to take calcium supplements for bone health, choose an inexpensive calcium carbonate supplement.
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  • The material safety data sheet for Bradford corn gluten lists only corn gluten meal and calcium carbonate as ingredients.
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  • Therefore a reduction in the partial pressure of the gas in the atmosphere, or a rise in the temperature of the water, or a violent agitation of the sea itself, will lead to precipitation of calcium carbonate.
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