The State of Metal Ions in Natural Waters

1984 ◽  
Vol 12 (4) ◽  
pp. 335-361 ◽  
Author(s):  
P. N. Linnik ◽  
B. I. Nabivanets
Keyword(s):  
Metal Ions ◽  
Natural Waters ◽  
The State

Rates of Reaction of Dissolved Oxygen With Scavengers in Sweet and Sour Brines

CORROSION ◽  
1969 ◽  
Vol 25 (10) ◽  
pp. 397-404 ◽  
Author(s):  
E. S. SNAVELY ◽  
F. E. BLOUNT
Keyword(s):  
Transition Metal ◽  
Dissolved Oxygen ◽  
Metal Ions ◽  
Induction Period ◽  
Natural Waters ◽  
Reaction Rate ◽  
Transition Metal Ions ◽  
Zero Order ◽  
Laboratory Apparatus ◽  
High Ph

Abstract Rates of reaction of dissolved oxygen with H2S were measured in a laboratory apparatus using a polarographic type instrument for the measurement of oxygen concentrations. Results show that oxidation occurs only at high pH in the absence of catalytic species. The reaction is catalyzed by transition metal ions in the order Ni++>Co ++>Mn++>Cu++>Fe++. In all cases, the reaction rate increases with pH and is at first complex but becomes zero-order with respect to oxygen after a brief induction period. Some natural waters contain sufficient catalysts that additional amounts are not required for scavenging O2 with SO2 or Na2SO3. Sour waters cannot be scavenged with SO2 or Na2SO3 because of ineffectiveness of catalysts.

Complexation of Dissolved Organic Matter with Trace Metal Ions in Natural Waters

2012 ◽  
pp. 769-849 ◽  
Author(s):  
Khan M. G. Mostofa ◽  
Cong-qiang Liu ◽  
Xinbin Feng ◽  
Takahito Yoshioka ◽  
Davide Vione ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Trace Metal ◽  
Metal Ions ◽  
Natural Waters ◽  
Trace Metal Ions

scholarly journals Properties of the urban watercourse composition under anthropogenic load

2020 ◽  
Vol 164 ◽  
pp. 01015
Author(s):  
Viktor Denisov ◽  
Ekaterina Bondarenko ◽  
Alexander Scherbakov
Keyword(s):  
Sustainable Development ◽  
Anthropogenic Impact ◽  
Natural Waters ◽  
The State ◽  
Anthropogenic Load ◽  
Urban Rivers ◽  
The Sustainable Development ◽  
Industrial Enterprises ◽  
Chemical Indicators ◽  
Urban Watercourse

The anthropogenic impact on urban rivers is very significant. Industrial enterprises, municipal, and agricultural organizations discharge wastewater directly into the rivers. In the samples of the studied water, certain properties were found. The water in the river is cloudy, brown in color, and in some places has a sharp smell. Extraneous impurities and foam were detected in water. Moreover, various chemicals were found, which are not characteristic to natural waters. The analyzed water is highly polluted as shown by the following chemical indicators, which reported results higher than the Maximum Allowable Concentration: Fe concentration is 24 times higher than standard, Cu is 5 times higher, Mn is 6 times higher, Al is 366 times higher, Hg is 3 times higher, Zn is 4 times higher, NO2 is 2.5 times higher, hydrocarbon pollution is 2.8 times higher, NH4 is 1.9 times higher. Therefore, it is necessary to immediately develop effective methods for monitoring the state of the watercourse, both economic and energetic. To save the sustainable development of the natural system.

An Equilibrium Model for the Nta Complexation of Metal Ions in Natural Waters

1971 ◽  
Vol 2 (3) ◽  
pp. 121-129 ◽  
Author(s):  
W. A. Cilley ◽  
D. A. Nicholson
Keyword(s):  
Metal Ions ◽  
Equilibrium Model ◽  
Natural Waters

scholarly journals Methylidynetrisphosphonates: Promising C1building block for the design of phosphate mimetics

2013 ◽  
Vol 9 ◽  
pp. 991-1001 ◽  
Author(s):  
Vadim D Romanenko ◽  
Valery P Kukhar
Keyword(s):  
Carbon Atom ◽  
Metal Ions ◽  
Building Block ◽  
State Of The Art ◽  
The State ◽  
Backbone Structure ◽  
Endogenous Metabolites

Methylidynetrisphosphonates are representatives of geminal polyphosphonates bearing three phosphonate (PO3H2) groups at the bridged carbon atom. Like well-known methylenebisphosphonates (BPs), they are characterized by a P–C–P backbone structure and are chemically stable mimetics of the endogenous metabolites, i.e., inorganic pyrophosphates (PPi). Because of its analogy to PPiand an ability to chelate metal ions, the 1,1,1-trisphosphonate structure is of great potential as a C1building block for the design of phosphate mimetics. The purpose of this review is to present a concise summary of the state of the art in trisphosphonate chemistry with particular emphasis on the synthesis, structure, reactions, and potential medicinal applications of these compounds.

scholarly journals Self-purification ability of natural waters in the arid zones

2018 ◽  
pp. 36-42
Author(s):  
Sofiya Romanova ◽  
Roza Ryskaliyeva ◽  
Oksana Ponomarenko
Keyword(s):  
Metal Ions ◽  
Clay Minerals ◽  
Natural Waters ◽  
The Self ◽  
Sorption Properties ◽  
Dynamic Mode ◽  
Arid Zones ◽  
Water Reservoirs ◽  
Lake Balkhash ◽  
Closed Lake

The paper presents the analysis of literature data and research results on self-purification and self-purification ability of natural waters at arid zones (on example of closed Lake Balkhash). The self-purification processes are a combination of all natural (hydrodynamic, chemical, microbiological and hydrobiological) processes in contaminated natural waters. A large number of pollutants and specific (physical and geographical) conditions of reservoirs causes the complexity and variety of cleaning processes of natural waters. Large amounts of pollutants discharged into water reservoirs and drains impede the self-purification processes. It has been established that the sediments and clay of Lake Balkhash absorb the metal ions. Thus, the process of absorption of Mn2+ ions by clay minerals mainly occurs within the first three hours of contact, whereas sorption by slits continues until 10-15 days. The sediments are good absorbents for cadmium (90%), zinc (86%) and copper (78%). The sorption properties in the dynamic mode decreases in the row of zeolite (SEC = 1.02·10-3), then Fe (OH)3 (SEC = 0.28·10-3) and Al (OH)3 (SEC = 0.10·10-3 mmol-eq/g) with respect to Mn+2 ion with concentrations from 5.0 to 100 μg/L.

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