scholarly journals Amorphous Calcium–Magnesium Carbonate (ACMC) Accelerates Dolomitization at Room Temperature under Abiotic Conditions

2020 ◽  
Vol 20 (3) ◽  
pp. 1434-1441 ◽  
Author(s):  
German Montes-Hernandez ◽  
François Renard ◽  
Anne-Line Auzende ◽  
Nathaniel Findling
Keyword(s):  
Room Temperature ◽  
Magnesium Carbonate ◽  
Abiotic Conditions ◽  
Calcium Magnesium

scholarly journals Onset of acid-neutralizing action of a calcium/magnesium carbonate-based antacid using an artificial stomach model: an in vitro evaluation

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Maxim Voropaiev ◽  
Deborah Nock
Keyword(s):  
In Vitro Study ◽  
Magnesium Carbonate ◽  
Human Gastrointestinal Tract ◽  
Pepsin Activity ◽  
Onset Of Action ◽  
Over The Counter ◽  
Calcium Magnesium ◽  
Secondary Objective ◽  
Time Required

Abstract Background Calcium carbonate antacids are potent over-the-counter antacids, made more effective by adding magnesium carbonate (as in Rennie, Bayer). However, published studies on their onset of action are scarce. Therefore, we carried out an in vitro study comparing Rennie and placebo under simulated conditions of the human stomach (artificial stomach model) to reconfirm the onset of action of Rennie. Methods The validated Simulator of the Human Intestinal Microbial Ecosystem apparatus (SHIME, ProDigest, Belgium) was used, comprising five reactors simulating different parts of the human gastrointestinal tract. Both Rennie and placebo were dosed at two tablets per incubation over six independent, 2-h stomach incubations each. Primary objectives: to evaluate the time required to achieve pH 3.0, 3.5, 4.0 and 4.5, as well as the maximum pH reached. Secondary objective: to evaluate pepsin activity over the entire 2-h gastric incubation. Results After addition of Rennie, the gastric medium reached a pH of 3.0 within 40 s. The maximum pH of 5.24 was maintained for almost 10 min. In contrast, the maximum pH with placebo was 1.28 during the entire gastric simulation. Furthermore, Rennie strongly reduced the activity of mucosa-damaging pepsin during the period of increased pH. With placebo, the lower pH resulted in consistently high loads of digested peptides, reflecting the high cumulative and instantaneous pepsin activity. Conclusions New data is a critical component in informed decision making. Our data confirm the high efficacy and fast onset of acid-neutralizing action of Rennie, which begins to work within seconds.

scholarly journals Effect of an industrial chemical waste on the uptake of cations by green oat

2007 ◽  
Vol 72 (6) ◽  
pp. 629-633 ◽  
Author(s):  
Hortensia Radulescu ◽  
Lidia Taubert ◽  
Sándor Kiss ◽  
Ecaterina Princz ◽  
Éva Stefanovits-Bányai
Keyword(s):  
Avena Sativa ◽  
Magnesium Carbonate ◽  
Antagonistic Effect ◽  
Chemical Waste ◽  
Copper Compounds ◽  
Industrial Manufacture ◽  
Calcium Magnesium ◽  
Calcium And Magnesium ◽  
Iron And Manganese ◽  
Manganese Chromium

Calcium carbonate, obtained as a waste in the industrial manufacture of magnesium carbonate and magnesium oxide from dolomites, can be applied in agriculture. The appreciable amounts of calcium and magnesium in this waste, together with impurities such as iron, zinc, manganese, chromium and copper compounds can be useful in soil amendment and plant nutrition. This paper presents preliminary results of the testing of several waste doses on soil, pursuing their effect on the uptake of cations by green oat (Avena sativa L.). The obtained results show an increase in the amount of calcium, magnesium, zinc and copper found in green oat plants, as well as a decrease of the content of iron and manganese with increasing waste dose. These results may be explained by lower absorptions of iron and manganese because of the antagonistic effect created by high amounts of calcium and magnesium, as well as by the presence of copper and zinc. .

Study of Carbonizing Processes for Sintered Dolomite

2007 ◽  
Vol 336-338 ◽  
pp. 2552-2555 ◽  
Author(s):  
Jing Hua Xue ◽  
Min Fang Han ◽  
Qing Yun Wang
Keyword(s):  
Calcium Carbonate ◽  
Calcium Hydroxide ◽  
Magnesium Hydroxide ◽  
Room Temperature ◽  
Xrd Analysis ◽  
Magnesium Carbonate ◽  
Crystal Phase ◽  
Carbonization Process

It is the easy and widely used way to make light calcium carbonate and magnesium carbonate from dolomite by carbonizing process. During this process, the dolomite is calcined at different temperature, from 700°C to 950°C to get the mixture including either calcium carbonate and magnesia or calcia and magnesia. Then the mixture is blended with water in different temperature from room temperature to 80°C. As a result, it is supposed to get calcium hydroxide and magnesium hydroxide, but XRD analysis reveals that it is not accord with the theory. Magnesium hydroxide can not be obtained during this reaction. After the carbonization process, the calcium carbonate and a kind of mixture which is composed with different crystal phase of Mg5(CO3)4(OH)2[H2O]4 have been produced, instead of magnesium carbonate. The magnesia is gotten when the mixture is calcined at 450~750°C.

scholarly journals MgCaCO3Versus CaCO3in Peritoneal Dialysis Patients – a Cross-over Pilot Trial

2015 ◽  
Vol 35 (1) ◽  
pp. 31-34 ◽  
Author(s):  
Baigalmaa Evsanaa ◽  
Irene Liu ◽  
Babak Aliazardeh ◽  
Sara Mahdavi ◽  
Gursarn Bajwa ◽  
...  
Keyword(s):  
Peritoneal Dialysis ◽  
Calcium Carbonate ◽  
Pilot Study ◽  
Serum Magnesium ◽  
Pilot Trial ◽  
Magnesium Carbonate ◽  
Serum Phosphate ◽  
Phosphate Binders ◽  
Serum Phosphate Level ◽  
Calcium Magnesium

BackgroundDespite adverse effects such as constipation, vascular calcification, and hypercalcemia, calcium-based salts are relatively affordable and effective phosphate binders that remain in widespread use in the dialysis population. We conducted a pilot study examining whether the use of a combined magnesium/calcium-based binder was as effective as calcium carbonate at lowering serum phosphate levels in peritoneal dialysis (PD) patients.MethodsThis was a cross-over, investigator-masked pilot study in which prevalent PD patients received calcium carbonate alone (200 mg calcium per tablet) or calcium magnesium carbonate (100 mg calcium, 85 mg magnesium per tablet). Primary outcome was serum phosphate level at 3 months. Analysis was as per protocol.ResultsTwenty patients were recruited, 17 completed the study. Mean starting dose was 11.35 ± 7.04 pills per day of MgCaCO3and 9.00 ± 4.97 pills per day of CaCO3. Mean phosphate levels fell from 2.13 mmol/L to 2.01 mmol/L (95% confidence interval (CI): 1.76 – 2.30, p = 0.361) in the MgCaCO3group, and 1.81 mmol/L (95% CI: 1.56 – 2.0, p = 0.026) in the CaCO3alone group. Six (35%) patients taking MgCaCO3and 9 (54%) taking CaCO3alone achieved Kidney Disease Outcomes Quality Initiative (KDOQI) serum phosphate targets at 3 months. Diarrhea developed in 9 patients taking MgCaCO3and 3 taking CaCO3. Serum magnesium exceeded 1.4 mmol/L in 5 patients taking MgCaCO3while serum calcium exceeded 2.65 mmol/L in 3 patients receiving CaCO3. When compared to the initial dose, the prescribed dose at 3 months was reduced by 44% (to 6.41 tablets/day) in the MgCaCO3group and by 8% (to 8.24 pills per day) in the CaCO3alone group.ConclusionCompared with CaCO3alone, the preparation and dose of MgCaCO3used in this pilot study was no better at lowering serum phosphate levels in PD patients, and was associated with more dose-limiting side effects.

scholarly journals Effects of calcium magnesium carbonate and roughage level on feedlot performance, ruminal metabolism, and site and extent of digestion in steers fed high-grain diets1,2

2008 ◽  
Vol 86 (11) ◽  
pp. 2998-3013 ◽  
Author(s):  
G. I. Crawford ◽  
C. D. Keeler ◽  
J. J. Wagner ◽  
C. R. Krehbiel ◽  
G. E. Erickson ◽  
...  
Keyword(s):  
Magnesium Carbonate ◽  
Feedlot Performance ◽  
Calcium Magnesium

scholarly journals ​Impact Assessment of Oil Exploration Activities on Soil Fertility in Delta State, Nigeria

2021 ◽  
Author(s):  
S.A. Ojobor ◽  
O.F. Omovie-Stephen ◽  
O. Abirhire
Keyword(s):  
Organic Matter ◽  
Soil Fertility ◽  
Room Temperature ◽  
Soil Improvement ◽  
Oil Exploration ◽  
Limited Information ◽  
Nutrient Index ◽  
Calcium Magnesium ◽  
The Impact ◽  
Nitrogen Phosphorus

Background: Limited information on impact of oil exploration on soil fertility in Nigeria is hindering the efforts toward soil improvement. Hence, the impact of oil exploration on soil fertility in four local government areas (LGA), Delta State, Nigeria was evaluated in 2020. Methods: Two LGAs in oil producing (Ukwani, Ndokwa) and non oil producing (Aniocha South, Ika South) and three communities in each LGA and one crop largely cultivated was purposely chosen. Soil samples were taken from 0-30 cm depth at 10 meters intervals along transverses cut at 100 m apart. The samples were air-dried at room temperature, crushed and made to pass 2 mm sieve. Soil pH, organic matter, nitrogen, phosphorus, calcium, magnesium, potassium and sodium were measured. Data were statistical analyzed and least significance difference at α0.05 was used to separate means while Parker’s nutrient index was used to rate the fertility. Result: Ukwani soil was strongly acidity (5.30), Ndokwa was moderately acidity (5.83) while Ika (6.61) and Aniocha (6.27) were slightly acidity. Organic matter (2.54 and 2.48%) and phosphorus (16.98 and 14.51 mg/kg) were medium in Ika and Aniocha whereas, both were low in Ukwani (1.49%, 10.14 mg/kg) and Ndokwa (1.74%, 12.52 mg/kg), respectively. Nitrogen was high in Ika (0.27%) and Aniocha (0.42%), medium in Ndokwa (0.18%) and low in Ukwani (0.15%). Potassium and sodium were high in Ika, Aniocha and Ukwani but medium in Ndokwa. Calcium was high in Ika, medium in Aniocha but low in Ndokwa and Ukwani. Magnesium was high in Ika, Aniocha and Ndokwa but was medium in Ukwani.

scholarly journals Assessment of Seawater Intrusion into Shallow Coastal Aquifer in Kanyakumari District, Tamilnadu, India

2020 ◽  
Vol 9 (3) ◽  
pp. 3006-3014
Keyword(s):  
Seawater Intrusion ◽  
Sea Water ◽  
Magnesium Carbonate ◽  
Research Area ◽  
Quality Parameters ◽  
Shallow Aquifer ◽  
Quality Of Water ◽  
Random Samples ◽  
Calcium Magnesium

Improved use of groundwater is often causing intrusion of seawater. The intrusion of seawater also takes place in coastal areas. In this analysis, the distribution and the levels of intrusion in the research area (Kanyakumari district, Tamilnadu, India) are determined. The test was done using random samples at a period of 15 days in which 30 different samples were taken in 5 different locations with a certain distance from the seashore, then chemical analysis including pH, electrical conductivity (EC), total dissolved solids (TDS), chloride, sodium, calcium, magnesium, carbonate, and bicarbonate water quality parameters were carried out. Chloride Bicarbonate Ratio was used for the calculation of the penetration rate of the seawater, and subsequently chloride and electric conductivity were defined as type and quality of water characters. The results showed that the shallow aquifer was intruded by seawater at several sample levels, which was included in the normal to high intrusion classification. The sea water intrusion was classified as freshwater to saltwater, the concentrations in chloride ranged from 159 to 6021 mg / L. The ratio of bicarbonate chloride was 0.28 to 21.46, normally above 15.5, indicating that groundwater was disturbed. As a result, in comparison to standards or other seawater intrusion indicators, Rajakamangalam-well 1 (RM-W1) has been affected by seawater intrusion highly.

scholarly journals Clay minerals affect calcium (magnesium) carbonate precipitation and aging

2021 ◽  
Vol 567 ◽  
pp. 116971
Author(s):  
Zsombor Molnár ◽  
Péter Pekker ◽  
István Dódony ◽  
Mihály Pósfai
Keyword(s):  
Clay Minerals ◽  
Magnesium Carbonate ◽  
Carbonate Precipitation ◽  
Calcium Magnesium
Sign in / Sign up

Export Citation Format

Share Document