| 词汇 | calcium-carbonate |
| 释义 | calcium carbonate noun[ U ] chemistry specializeduk /ˌkæl.si.əm ˈkɑː.bən.eɪt/ us /ˌkæl.si.əm ˈkɑːr.bən.eɪt/ a common, white chemical compound found naturally as chalk, marble, and limestone, and in bones and shells, etc.碳酸钙 Chemicals, chemical compounds & gases acetic acid acetone acrolein acrylamide activated charcoal adenine agglomerate ethyl alcohol glyphosate H2O HCFC HFC hyaluronic acid hydrochloric acid laughing gas limescale meths oxyacetylene prussic acid tartaric acid During the fermentation it is necessary to neutralize the acetic acid formed with sodium or calcium carbonate. If a thin white crust appears on the limewater solution it is due to the formation of calcium carbonate coming in contact with the air and consequently does no harm. Many white pigments, such as zinc oxide, zinc sulphide, calcium carbonate, barium carbonate, calcium sulphate, lead white, etc., turn brown to black, and no white lacquer can be obtained with them. Sewage will be thoroughly nitrified only when a sufficient supply of calcium carbonate, or some other base, is available. The chief materials forming the mineral matter are calcium phosphate and calcium carbonate. Examples of calcium carbonatecalcium carbonate Occasional interbeds of fine-grained carbonate may reflect gravity input of peri-platform ooze, rather than sea-floor preservation of calciumcarbonate. This finding had considerable public health implications and resulted in calciumcarbonate being added to wartime flour in order to prevent rickets. Secreted products among the non-pogonophoran annelids range from mucus to calciumcarbonate. Each 30 seeds received 1 ml of inoculum and were pelletized with calciumcarbonate, just before sowing. The primary fossilized mineral(s) are calciumcarbonate enriched with magnesium. They found that calciumcarbonate was usually deposited around the grafted test which then adhered firmly. Calcium phosphate appears to be much less soluble than calciumcarbonate in salt solutions and more complex biological media. The carbon dioxide would eventually precipitate as calciumcarbonate and the hydrogen sulphide would react with iron and form pyrite. These calciumcarbonate inclusions must have caused big problems for the medieval potters, because during the firing process they cause cracking of the clay. It is worth noting that although calciumcarbonate is rare in both deposits, it is preserved with various colours. Continuous, tabular cementstone horizons are composed of calciumcarbonate. The opposite scenario, in which respiration prevails, could yield a variety of minerals including calciumcarbonate as a permanent signature. Calcium sulphate, phosphogypsum and calciumcarbonate in the amelioration of acid subsoils for growth. Recent work, however, has led to the theory of canalithiasis34 in which calciumcarbonate debris floats freely in the posterior canal and has a 'plunger' effect when moved under gravity. The role of the calciumcarbonate-calcium phosphate switch in the mineralization of soft-bodied fossils. See all examples of calcium carbonate These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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