calcareous material caco

Effect of the calcareous deposits on the cathodic

2020-12-16 · This revealed that the calcareous deposits mixed with CaCO 3 and Mg(OH) 2 under cathodic protection. The environment including temperature, pressure, and

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(PDF) Enhancing the Durability of Calcareous Stone

2017-8-10 · The aim of this study is to evaluate the effectiveness of CaCO3 nanoparticles as a consolidation and protection material for calcareous stone monuments, when those nanoparticles used are dispersed...

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Calcareous Algae SpringerLink

The term “calcareous algae” refers to various kinds of benthic and planktonic algae whose thalli contain biochemically precipitated calcium carbonate (CaCO 3) as skeletal material (Wray, 1977; Braga and Riding, 2005). Precipitation of CaCO 3 (as calcite and/or aragonite) may occur within or on the algal bodies. The term may also include mechanically accreted deposits of calcium carbonate caused by

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A rapid birefringence method for measuring

2002-1-1 · Sample suspensions containing 3–100% CaCO 3 (by weight) were prepared from calcareous marine sediment material and varying amounts of non-birefringent diatomaceous earth. The samples ranged in total suspended material from 0.003 to 249 mg l −1 and PIC from 0.03 to 1820 μmol CaCO 3 l

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CaCO3 nanostructured crystals induced by nacreous

Nanostructured CaCO 3 crystals are produced in vitro by adding the acid-soluble organic matrix (SOM) extracted from the nacreous layer of Pinctada margaritifera pearl oyster shell to a supersaturated solution of calcium carbonate. For SOM concentrations

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The Genesis of Certain Calcareous Floodplain Soils of

A study was made to determine the origin of the calcareous material found in certain floodplain soils of the limestone valleys of Virginia. The CaCO 3 in these soils was derived from the highly fractured and faulted limestone underlying the area.

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Initial soil aggregate formation and stabilisation in

2021-3-1 · In addition, CaCO 3-mediated aggregate cementation can take place due to the precipitation of carbonates. Carbonates are also present in calcareous parent materials, such as loess, where carbonates cement primary particles together and play a crucial role in giving the parent material its mechanical strength (Meng and Li, 2019, Yates et al., 2017).

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Attapulgite and processed oyster shell powder

2021-2-1 · It was a calcareous material with the Ca(OH) 2:CaO:CaCO 3 ratio of 1:1:2, and total Ca content of 40% (w/w). Attapulgite (AT) was a clay material from Jiangsu Tianxiang Biotechnology Co., Ltd. Attapulgite (AT) was a clay material from Jiangsu Tianxiang Biotechnology Co., Ltd.

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Effect of surface calcareous deposits on hydrogen

2021-1-19 · During this procedure, material is susceptible to hydrogen absorption which leads to material degradation in its mechanical properties. Under CP, the pH of metal/solution interface increases due to oxygen reduction (1) and water dissociation (2) reactions, resulting in the formation of CaCO 3 (3,4) or Mg(OH) 2 (5), generally called calcareous deposits [ 15,16 ].

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The National Soil Map and Soil Classification

2020-6-1 · Non-calcareous: <1 percent CaCO 3; Calcareous: 1 to 40 percent CaCO 3; Extremely calcareous (Carbonatic): >40 percent CaCO 3. c) Mineralogy. Materials containing distinctive mineralogy affecting nutrient supply, acidity or structural stability are distinguished as follows: Ferruginous: A large amount of iron oxides relative to the clay content;

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The growth mechanism of calcareous deposits under

2017-5-31 · The growth mechanism of the calcareous deposits was discussed by SEM and XRD analysis, and the crystal structure transformation of CaCO 3 under high pressure was investigated. The presented results may be helpful for the supplementation and perfection of CP theory in deep water.

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CaCO3 nanostructured crystals induced by nacreous

Nanostructured CaCO 3 crystals are produced in vitro by adding the acid-soluble organic matrix (SOM) extracted from the nacreous layer of Pinctada margaritifera pearl oyster shell to a supersaturated solution of calcium carbonate. For SOM concentrations above 25 ppm, the produced calcite crystals show two structural features of nacre and, more generally, of calcareous biocrystals: structuring

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Pedogenic carbonate formation: Recrystallization versus

2012-3-10 · calcareous parent materials and the rate of carbonate accu-mulation is presumed to depend mainly on rates of CaCO 3 influx from dust and/or rainfall [e.g., Gile et al., 1966; Machette, 1985; McFadden and Tinsley, 1985]. In calcare-ous parent material like loess, in contrast, the rate of pedo-genic carbonate buildup is a function of the rate at

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CALCAREOUS ALGAE CALCIFIED CYANOBACTERIA

ephemeral milk-white patches in freshwater calcareous lakes and shallow tropical seas formed by dense masses of suspended small CaCO. 3. crystals (Cloud, 1962). Whit-ing is a descriptive term, and all whitings are not neces-sarily biogenic. In addition to the triggering effect of phytoplankton photosynthesis, they could reflect essentially

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CaCO3 Precipitation in Multilayered Cyanobacterial Mats

2015-3-9 · CaCO 3 morphs precipitated from purely inorganic solutions. No metabolically (enzymatically) controlled formation of particular CaCO3 morphs by heterotrophic bacteria was observed in the studied mats. The apparent alternation of in vivo and post-mortem generated calcareous layers in the studied cyanobacterial mats may explain the alternation

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Research on the removal of calcareous and iron

2014-6-2 · products interacting with material adjacent to the iron. Iron is not a biologically toxic material and any iron immersed in seawater is rapidly colonized by marine organisms. These organisms build up a layer of skeletal material, predominantly calcium carbonate (CaCO 3). The subsequent diffusion of iron II ions (Fe 2+) and iron III ions (Fe3

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Does CaCO, in food deter feeding by sea urchins?

sume carbonate material as they graze on encrusting or boring algae, and can be very important bioeroders of coral reefs (McLean 1967, Birkeland 1989). Mespilia globulus is a short-spined, motile urchin which at- taches debris to its test. It is not thought to be an impor- tant bioeroder, but may ingest some calcareous sedi-

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Interface Shear Behavior between MICP-Treated

The interface shear behavior between MICP-treated calcareous sand and steel was investigated experimentally under different cementation levels and normal stresses. With the increase of CaCO 3 content, the peak shear strength increased, accompanied by obvious volume dilation, and the corresponding shear displacement was reduced.

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Instrumentsandmethods

2013-3-29 · CaCO 3l 1 in deep ocean waters to >30mmol CaCO 3l 1 in open ocean surface waters during phytoplankton blooms (Balch et al., 1996b). Values up to 120mmol CaCO 3l 1Fthe highest ever recordedFwere observed duringa bloom in Norwegian coastal waters (Berge, 1962). The fraction of total suspended material (TSM) com

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The National Soil Map and Soil Classification

2020-6-1 · 3.2 Sand-rankers are soils formed in non-calcareous soft, unconsolidated sandy deposits other than alluvium. 3.2.1 Typical sand-rankers 3.4 Rendzinas are calcareous soils over chalk limestone or, extremely calcareous unconsolidated material. 3.4.1 Humic rendzinas 3.4.2 Grey rendzinas 3.4.3 Brown rendzinas 3.4.4 Colluvial rendzinas

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Calcium Carbonate in a Calcareous Soil from the

The development of calcareous soil in semiarid zones is accomplished by dissolution and reprecipitation of calcium carbonate (CaCO 3) minerals.The proportion of carbonate in the soil of the Jordan Valley that is pedogenic in origin was determined using the stable C isotope method.

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CaCO3 nanostructured crystals induced by nacreous

Nanostructured CaCO 3 crystals are produced in vitro by adding the acid-soluble organic matrix (SOM) extracted from the nacreous layer of Pinctada margaritifera pearl oyster shell to a supersaturated solution of calcium carbonate. For SOM concentrations above 25 ppm, the produced calcite crystals show two structural features of nacre and, more generally, of calcareous biocrystals: structuring

Get Price

CALCAREOUS ALGAE CALCIFIED CYANOBACTERIA

ephemeral milk-white patches in freshwater calcareous lakes and shallow tropical seas formed by dense masses of suspended small CaCO. 3. crystals (Cloud, 1962). Whit-ing is a descriptive term, and all whitings are not neces-sarily biogenic. In addition to the triggering effect of phytoplankton photosynthesis, they could reflect essentially

Get Price

CaCO3 Precipitation in Multilayered Cyanobacterial Mats

2015-3-9 · CaCO 3 morphs precipitated from purely inorganic solutions. No metabolically (enzymatically) controlled formation of particular CaCO3 morphs by heterotrophic bacteria was observed in the studied mats. The apparent alternation of in vivo and post-mortem generated calcareous layers in the studied cyanobacterial mats may explain the alternation

Get Price

Pedogenic carbonate formation: Recrystallization versus

2012-3-10 · calcareous parent materials and the rate of carbonate accu-mulation is presumed to depend mainly on rates of CaCO 3 influx from dust and/or rainfall [e.g., Gile et al., 1966; Machette, 1985; McFadden and Tinsley, 1985]. In calcare-ous parent material like loess, in contrast, the rate of pedo-genic carbonate buildup is a function of the rate at

Get Price

Interface Shear Behavior between MICP-Treated

The interface shear behavior between MICP-treated calcareous sand and steel was investigated experimentally under different cementation levels and normal stresses. With the increase of CaCO 3 content, the peak shear strength increased, accompanied by obvious volume dilation, and the corresponding shear displacement was reduced.

Get Price

Improving the availability of phosphorus from rock

2018-10-3 · calcareous soils cover more than 30% of the earth’s surface and their CaCO 3 content varies from a few percent to 95%.Leytem and Mikkelsen (2005) briefly explained the problem of phosphorus in calcareous soil that calcium ions are strongly bound to the phosphate and need to be released to the soil solution before a plant can

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Research on the removal of calcareous and iron

2014-6-2 · products interacting with material adjacent to the iron. Iron is not a biologically toxic material and any iron immersed in seawater is rapidly colonized by marine organisms. These organisms build up a layer of skeletal material, predominantly calcium carbonate (CaCO 3). The subsequent diffusion of iron II ions (Fe 2+) and iron III ions (Fe3

Get Price

Instrumentsandmethods

2013-3-29 · CaCO 3l 1 in deep ocean waters to >30mmol CaCO 3l 1 in open ocean surface waters during phytoplankton blooms (Balch et al., 1996b). Values up to 120mmol CaCO 3l 1Fthe highest ever recordedFwere observed duringa bloom in Norwegian coastal waters (Berge, 1962). The fraction of total suspended material (TSM) com

Get Price

Phosphorus retention in calcareous soils and the

2006-6-12 · A survey of the interactions between phosphorus (P) species and the components of calcareous soils shows that both surface reactions and precipitation take place, especially in the presence of calcite and limestone. The principal products of these reactions are dicalcium phosphate and octacalcium phosphate, which may interconvert after formation.

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