scholarly journals Mjerenje tvrdoće vode u odabranim krškim pojavama Žumberačke gore

Geoadria ◽  
2017 ◽  
Vol 10 (2) ◽  
pp. 157
Author(s):  
Nenad Buzjak ◽  
Marina Trpčić
Keyword(s):  
Calcium Ions ◽  
Water Samples ◽  
Carbonate Rocks ◽  
Water Hardness ◽  
Magnesium Content ◽  
Karst Spring ◽  
Total Calcium ◽  
Hydrological Characteristics ◽  
Water Courses ◽  
Calcium And Magnesium

In the paper are published the results of deteremination of total, Calcium and Magnesium water hardness from four caves, one karst spring and one sinking creek in the area of Žumberačka Gora Mt. in NW Croatia. Water hardness is a measure of carbonate rocks dissolution and corrosion. Besides, it can give a hint of undergorund water courses since the stream that flows from dolomite has higher Magnesium content and one that flows from limestone has higher Calcium ions content. Geological, geomorphological and hydrological characteristics of all features from which water samples were taken are also described.

scholarly journals THE CALCIUM AND MAGNESIUM CONTENT OF NORMAL URINE

1916 ◽  
Vol 28 (1) ◽  
pp. 237-240
Author(s):  
C.Ferdinand Nelson ◽  
W.E. Burns
Keyword(s):  
Magnesium Content ◽  
Calcium And Magnesium ◽  
Normal Urine

scholarly journals Alkalinity–silicon ratio as an assessment factor for the efficiency of silicate slags in wetland rice

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Thoppil Sreenivasan Sandhya ◽  
Nagabovanalli Basavarajappa Prakash
Keyword(s):  
Silicon Content ◽  
Chemical Properties ◽  
Magnesium Content ◽  
Wetland Rice ◽  
Agronomic Efficiency ◽  
Economic Production ◽  
Incubation Experiments ◽  
Calcium And Magnesium ◽  
Si Content ◽  
Assessment Factor

AbstractSilicate slags are one of the most widely used silicon (Si) source in agriculture. Even though the agronomic significance of slags has been demonstrated in several crops, only a few attempts were made to evaluate these Si sources based on their chemical composition. The main objective of this study was to characterize different silicate slags based on their chemical properties and to explore the effect of these chemical properties on the yield, and Si uptake in wetland rice, and dissolution of Si into the soil. Slags were characterised for pH, calcium and magnesium content (alkalinity, A), silicon content, 5 day Na2CO3 + NH4NO3 extractable Si content, and alkalinity to Si ratio (A/Si). Greenhouse and incubation experiments were also conducted using different silicate slags and wollastonite applied at the rate of 300 kg Si ha−1. Slags with A/Si < 3 were found to be ideal Si sources for the economic production of wetland rice and found consistent in increasing soil Si content and rice Si uptake. We conclude that the A/Si ratio of slags can be used as an important parameter to assess the agronomic efficiency of silicate slags in wetland rice.

scholarly journals Hydrochemical characteristics of the hot spring waters in the Kangding district related to the Lushan <i>M</i><sub>S</sub> 7.0 earthquake in Sichuan, China

2014 ◽  
Vol 2 (12) ◽  
pp. 7293-7308
Author(s):  
Z. Chen ◽  
X. Zhou ◽  
J. Du ◽  
C. Xie ◽  
L. Liu ◽  
...  
Keyword(s):  
Water Samples ◽  
Carbonate Rocks ◽  
Hot Springs ◽  
Hot Spring ◽  
Spring Water ◽  
Lushan Earthquake ◽  
Hydrochemical Characteristics ◽  
Hydrochemical Data ◽  
Deep Earth ◽  
Precipitation Water

Abstract. Hydrogeochemistry of 10 hot springs in the Kangding district was investigated by analyzing cation and anion concentrations of the spring waters. The water samples were collected within 5 days after the Lushan earthquake. The spring waters are classified into 7 chemical types based on the hydrochemical compositions. Comparison with the hydrochemical data before the Lushan earthquake, concentrations of Ca2+, HCO3− and TDS of the waters from the Guanding, Erdaoqiao, Gonghe, Erhaoying, Tianwanhe and Caoke springs evidently increased, which resulted from enhancing interaction between deep-earth fluids and carbonate rocks by the increment of dissolved CO2 in the groundwater. Concentrations of Na+, Cl− and SO42− of the waters from the Guanding, zheduotang, Xinxing and Gonghe springs were decreased, indicating dilution of precipitation water. Concentrations of Na+ and SO42− of the Erhaoying spring water increased, which may be attributed to the more supplement of fluids enriched in sulfur. The results indicate that hydrochemical components of spring water can be used as an effective indicator for earthquakes.

scholarly journals EXPERIMENTAL HYGIENIC ESTIMATION OF CALCIUM AND MAGNESIUM CONCENTRATIONS IN DRINKING WATER, AND ITS HARDNESS

2019 ◽  
Vol 98 (8) ◽  
pp. 811-819
Author(s):  
E. M. Trofimovich ◽  
S. A. Nedovesova ◽  
Roman I. Aizman
Keyword(s):  
Drinking Water ◽  
Thyroid Hormones ◽  
Quantitative Estimation ◽  
Experimental Studies ◽  
Water Hardness ◽  
Blood Parameters ◽  
Plasma Metabolites ◽  
Total Hardness ◽  
Calcium And Magnesium ◽  
Plasma Magnesium

Introduction. The lack of hygienic norms for Mg2+ and Ca2+ in drinking water and the wide ranges of acceptable hygienic norms (AHN) of these cations in water packaged in containers determine the relevance of experimental studies on the substantiation of AHN of Mg2+, Ca2+ and the hardness of drinking water with a centralized water supply to the population. Material and methods. Chronic experiments were performed on 5 groups of adult Wistar rats (n = 50): control animals received drinking water (Ca2+ 20.0; Mg2+ 6.0 mg / dm3, hardness 1.5-1.8 mEq/dm3); four other groups received model drinking water with different contents of Ca2+ (50, 80, 100 and 140 mg/dm3) and Mg2+ (20, 40, 55 and 85 mg/dm3) by adding CaCl2 or MgSO4 salts to the control water. The effect of these drinking water samples on kidney function, ion osmotic blood parameters, plasma metabolites of lipid and protein metabolism, as well as the concentration of thyroid hormones (T3 and T4) and cortisol were studied. Results. Prolonged action of increased concentrations of Ca2+ and Mg2+ on the organism was established to cause alterations in fat metabolism, the adaptive activation of osmoregulatory and ion regulatory kidney functions, increasing the concentration of thyroid hormones and a decrease of cortisol titer in plasma. Magnesium led to more pronounced changes in water-salt metabolism, and at a concentration of 85.0 mg/dm3 (7.0 mg-Eq/dm3) - to depletion of secretion of the described hormones. Conclusion. Based on the obtained results, individual ranges for AHN of calcium and magnesium concentrations in water were recommended. The upper limit of AHN of drinking water total hardness is of 7.0 mg-Eq/dm3 at the joint presence of Ca2+and Mg2+. The rule of hygienic qualitative and quantitative estimation of calcium and magnesium types of drinking water hardness is formulated.

scholarly journals Ecological Quality of Natural Waters from of Kharkiv Urban Springs

2019 ◽  
Keyword(s):  
Water Samples ◽  
Natural Waters ◽  
Electrical Potential ◽  
Field Research ◽  
Water Hardness ◽  
Atomic Absorption Spectrophotometry ◽  
Nitrate Content ◽  
Pollutant Concentrations ◽  
Rigidity Index ◽  
The City

Purpose. Estimation of ecological safety of spring waters of the city of Kharkiv. Methods. Field research, atomic absorption spectrophotometry, analytical methods for studying water quality indicators. Results. Natural water samples were analyzed on the following parameters: pH, electrical potential, nitrate content, chlorides, ammonia, transparency, turbidity, and water hardness. The highest values of the content of nitrates, nitrites, as well as the level of alkalinity and rigidity were found in a sample from the Kholodnogorsk spring. In the water from the Zhukovsky spring the high content of chlorides is found, which is one and a half times higher than the concentration in water from other city springs. In the water from the Glyboky Yar spring the lowest mineralization of water was detected, and in the water from the Sarzhin Yar spring - the highest of the studied samples of water from the natural springs of Kharkiv. However, all identified pollutant concentrations except for the rigidity index is not dangerous for a person, because they are not exceeded by the MAC. The results of research on water samples from the Sarzhin Yar spring and from the spring in Yunost park (Kholodnogorsk source) in 2019, compared to the results of a similar study conducted in 2015. It was determined that in the water from the Sarzhin Yar spring the rigidity index increased 3.4 times, and in the sample from the spring in Yunost park (Kholodnogorsk spring) almost 6 times. Conclusions. It is determined that in the territory of the city of Kharkiv, water from the Zhukovskii spring in the Kyivskiy district is fully suitable for consumption, because its chemical composition is fully in line with the sanitary norms that apply to drinking spring waters. The value of the level of hardness of water in all samples, except Zhukovsky spring, indicate that the normative value exceeds 2-3 times. The rigidity of drinking water that exceeds the MAC may adversely affect human health. Therefore, the only ecologically safe, among the investigated, can be considered water from the Zhukovsky spring (Kievskiy district in Kharkiv). For other sources, it is recommended to modernize the water collection sites for the population, reconstruct the system of water supply for the supply of water from these sources, as well as to introduce additional stages of their treatment on the way to the consumer.

STUDIES CONCERNING THE DETERMINATION OF CALCIUM AND MAGNESIUM IONS IN THE DUMBRAVITA AREA DRINKING WATER (FOUNTAIN WATER)

2020 ◽  
Vol 34 (1) ◽  
pp. 17-24
Author(s):  
Aurica Pop ◽  
Keyword(s):  
Drinking Water ◽  
Water Samples ◽  
Photometric Method ◽  
Magnesium Ions ◽  
Precise Analysis ◽  
Calcium And Magnesium ◽  
Cost Efficient ◽  
Calcium And Magnesium Ions

The paper showcases research conducted with the purpose of determining the Ca2+ and Mg2+ ions in the drinking water (fountain water) of a common household located in Dumbravita, Maramures County, Romania. The photometric method was used for this goal, as well as a Calcium and Magnesium Photometer. This study argues about implementing cost efficient techniques and precise analysis in order to determine Ca and Mg ions in the water samples.

THE DETERMINATION OF CALCIUM AND MAGNESIUM IN BLOOD USING ONE INDICATOR

1959 ◽  
Vol 37 (1) ◽  
pp. 225-229 ◽  
Author(s):  
H. M. Czajkowska Robinson ◽  
J. C. Rathbun
Keyword(s):  
Ethylenediaminetetraacetic Acid ◽  
Total Calcium ◽  
Eriochrome Black T ◽  
End Point ◽  
Acid Titration ◽  
Calcium And Magnesium

A rapid ethylenediaminetetraacetic acid titration for calcium and magnesium in serum requiring 0.1 ml of blood is described. Eriochrome black T is used as the sole indicator and the end point is observed photometrically. After determination of total calcium and magnesium, the calcium is removed as oxalate, the magnesium determined separately, and the calcium obtained by difference. The method is highly reproducible and is sensitive to ± 0.1 mg% of either calcium or magnesium.

scholarly journals Increase of 14C Activity of Dissolved Inorganic Carbon Along a River Course

Radiocarbon ◽  
1986 ◽  
Vol 28 (2A) ◽  
pp. 515-521 ◽  
Author(s):  
Dušan Srdoč ◽  
Ines Krajcar-Bronić ◽  
Nada Horvatinčić ◽  
Bogomil Obelić
Keyword(s):  
Aquatic Plants ◽  
Water Samples ◽  
Organic Material ◽  
Root Respiration ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Stream Water ◽  
Exchange Process ◽  
Karst Spring ◽  
Stream Waters

Results of measurements for 3 years (1981–1983) of 14C activity of dissolved inorganic carbon (DIG) in water samples from the Korana River, as well as that of recent tufa and aquatic plants, showed that 14C concentration increases from karst spring to the estuary. A model describing the increase of 14C activity was developed assuming that the increase is due to the exchange of the dissolved CO2 in stream water with atmospheric CO2 and to dissolution of CO2 from the decay of organic material and root respiration. It is possible to distinguish these two contributions by measuring the δ13C values of DIC in water. As expected, our data show that the exchange process between atmospheric CO2 and DIC dominates at rapids and waterfalls, while biologic contribution is much higher in lakes and along the lowland flow of the Korana River. Agreement between the calculated and the measured activities supports the proposed mechanisms of chemical and isotopic exchanges in stream waters.

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