Florida and Bahama Marine Calcareous Deposits1

1939 ◽  
Author(s):  
E. M. Thorp
Keyword(s):  
Calcareous Deposits

Investigation of fig leaf extract as a novel environmentally friendly antiscalent for CaCO3 calcareous deposits

Desalination ◽  
2008 ◽  
Vol 230 (1-3) ◽  
pp. 314-328 ◽  
Author(s):  
A.M. Abdel-Gaber ◽  
B.A. Abd-El-Nabey ◽  
E. Khamis ◽  
D.E. Abd-El-Khalek
Keyword(s):  
Leaf Extract ◽  
Environmentally Friendly ◽  
Calcareous Deposits

scholarly journals Total content of macroelements and trace elements in Holocene calcareous gyttja from the post-bog area of north-western Poland

2019 ◽  
Vol 14 (No. 1) ◽  
pp. 40-46
Author(s):  
Grzegorz Jarnuszewski ◽  
Edward Meller
Keyword(s):  
Trace Elements ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Total Content ◽  
Major And Trace Elements ◽  
Carbonate Mineral ◽  
Minor Components ◽  
Ignition Loss ◽  
Calcareous Deposits ◽  
North Western

The study covered 6 sites located in the Vistula glaciation area in north-western Poland, where the Holocene calcareous (gyttja) deposits occur. Three types of such calcareous deposits were isolated: marly (groundwater calcretes) (CaCO<sub>3</sub> &gt; 80%, loss of ignition &lt; 20%, non-carbonate fractions &lt; 20%), calcareous gyttja (CaCO<sub>3</sub> 50–80%, loss of ignition &lt; 40%, non-carbonate fractions &lt; 40%), and clay calcareous gyttja (CaCO<sub>3</sub> 20–50%, loss of ignition &lt; 30%, non-carbonate fractions &lt; 60%). The content of major and trace elements was determined in different horizons. Several parameters of Holocene calcareous deposits were determined, namely carbonate status, total organic carbon, non-carbonate mineral fractions and several major and minor components. Close correlations between CaCO<sub>3</sub> and Ca, Mg contents, between non-carbonate fraction and K, Zn and Cu contents, as well as between ignition loss and Zn and Cu contents were observed in the sediments. The sediments exhibit vertical variability which relates to the genesis of sediments and soils. The highest content of macroelements was recorded in the uppermost layers for Ca, Mg, Na, and Mn and for microelements (trace elements) in bottom layers for S, P, K, Fe, Zn, Cu, Pb, and Ni.  

scholarly journals Malacofauna of Holocene freshwater calcareous deposits of Lithuania

Geologija ◽  
2010 ◽  
Vol 52 (1) ◽  
pp. 16-24
Author(s):  
Aleksander Sanko ◽  
Julius Vainorius ◽  
Monika Melešytė
Keyword(s):  
Calcareous Deposits

scholarly journals Mathematical Modeling of the Formation of Calcareous Deposits on Cathodically Protected Steel in Seawater

1993 ◽  
Vol 140 (3) ◽  
pp. 733-742 ◽  
Author(s):  
J. ‐F. Yan ◽  
T. V. Nguyen ◽  
R. E. White ◽  
R. B. Griffin
Keyword(s):  
Mathematical Modeling ◽  
Calcareous Deposits

scholarly journals Riken Natural Radiocarbon Measurements IV

Radiocarbon ◽  
1968 ◽  
Vol 10 (2) ◽  
pp. 333-345 ◽  
Author(s):  
Fumio Yamasaki ◽  
Tatsuji Hamada ◽  
Chikako Fujiyama
Keyword(s):  
Stainless Steel ◽  
Oxalic Acid ◽  
Fresh Water ◽  
Half Life ◽  
Water Shell ◽  
Calcareous Deposits ◽  
Modern Standard

The C14 dates given below are a continuation of the work presented in our previous list (RIKEN III), and have been obtained by counting CO2 at ca. 2 atm pressure in a 2.7 L stainless steel counter. Results obtained mainly during 1967 are described.Shell samples were treated with 1% HCl to remove the outer 10%. Calcareous deposits on the surface, when observed, were removed by mechanical means.Dates were calculated on the basis of the C14 half-life of 5568 yr and 95% NBS oxalic acid as modern standard. No correction was applied even for fresh water shell samples.

scholarly journals Anticorrosion Behaviour of Calcareous Deposits Formed on Steel Heat-Exchange Surfaces

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Georgii Vasyliev ◽  
Svitlana Vasylieva
Keyword(s):  
Corrosion Rate ◽  
Deposition Time ◽  
Tap Water ◽  
Steel Corrosion ◽  
Glass Tube ◽  
Linear Polarization Resistance ◽  
Scale Thickness ◽  
Calcareous Deposits ◽  
Scale Deposition ◽  
Steel Heat

A new electrode to study both scaling and corrosion processes of mild steel in tap water was developed. Two identical steel rings are placed on the outside of a glass tube which is heated from inside with an electric spiral; the rings are connected to a corrometer to form a two-electrode corrosion probe. The corrosion rate variations with scale thickness, scale deposition time, and solution composition are measured using the linear polarization resistance technique. The deposited scale was formed of calcite crystals of 50–100 μm as established with SEM and XRD. The scale layer of 0.2 mm formed in tap water within 90 hours reduces the steel corrosion rate from 0.8 to 0.1 mm/year and serves as a barrier layer to prevent further corrosion.

Effect of surface calcareous deposits on hydrogen uptake of X80 steel under strong cathodic current

2021 ◽  
Vol 46 (5) ◽  
pp. 4555-4566
Author(s):  
Yunying Xing ◽  
Yanni Sun ◽  
Xiuyun Wang ◽  
Zhu Wang ◽  
Yanxia Du ◽  
...  
Keyword(s):  
Hydrogen Uptake ◽  
Cathodic Current ◽  
Calcareous Deposits ◽  
X80 Steel ◽  
Effect Of Surface
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