Physical and chemical investigation of water and sediment of the Keban Dam Lake, Turkey:

2006 ◽  
Vol 268 (3) ◽  
pp. 529-537 ◽  
Author(s):  
F. Kulahci ◽  
M. Do?ru
Keyword(s):  
Chemical Investigation ◽  
Water And Sediment ◽  
Physical And Chemical

scholarly journals Variations in selected water quality variables and metal concentrations in the sediment of the lower Olifants and Selati rivers, South Africa

Koedoe ◽  
1994 ◽  
Vol 37 (2) ◽  
Author(s):  
T. Seymore ◽  
H.H. Du Preez ◽  
J.H.J. Van Vuren ◽  
A. Deacon ◽  
G. Strydom
Keyword(s):  
Water Quality ◽  
Sediment Quality ◽  
Metal Concentrations ◽  
Water And Sediment ◽  
Water And Sediment Quality ◽  
Special Concern ◽  
Olifants River ◽  
Western Side ◽  
Physical And Chemical

A survey of the water and sediment quality of the lower Olifants River and lower Selati River was carried out. Metal concentrations (Cr, Cu, Fe, Mn, Ni, Pb, Sr and Zn) in the water and sediment, as well as the physical and chemical characteristics of the water were determined over a two-year period (April 1990 - February 1992). The water quality of the lower Selati River, which flows through the Phalaborwa area, was found to be influenced by the mining and industrial activities in the area. It was also the case with the lower Olifants River after the Selati-Olifants confluence, although the concentrations of most variables did decrease from the western side of the Kruger National Park to the eastern side due to dilution of the water by tributaries of the Olifants River. Variables of special concern were sodium, fluoride. chloride, sulphate, potassium, the total dissolved salts and the metal concentrations (except strontium). The water quality of the Selati River in the study area is a great cause of concern and a further degradation thereof cannot be afforded.

scholarly journals DETECTION OF POLYCYCLIC AROMATIC HYDROCARBONS COMPOUNDS CONCENTRATIONS AND THEIR FATE IN TIGRIS RIVER WITHIN BAGHDAD CITY - IRAQ.

2019 ◽  
Vol 50 (Special) ◽  
Author(s):  
Khalaf & et al.
Keyword(s):  
Molecular Weight ◽  
Anthropogenic Activities ◽  
Dry Season ◽  
Wet Season ◽  
Tigris River ◽  
Water And Sediment ◽  
Polycyclic Aromatic ◽  
Physical And Chemical ◽  
Chemical Water

The objective of this study was to investigate concentrations, compositions of PAHs and to study physical and chemical water characteristic in Tigris River. This study was conducted during July 2017 to April 2018. The results showed that twelve PAHs compounds were detected in water and sediment of the river and the highest concentrations of these compounds were founded in sediment samples. Concentrations of PAHs in water samples have a ranged between (0.36µg. l-1) in wet season to (0.53µg.l-1) in dry season, while the sediment sample have a ranged between (633.23µg.kg-1) in wet season to (778.28µg.kg-1) in dry season. The origin of PAHs in water and sediment were pyrogenic depending on the ratios of Phenanthene/Anthracene, Anthacene/ (Anthacene + Phenanthene), low molecular weight/high molecular weight. According of these results, it can be concluded that the Tigris River is polluted with the PAHs, and anthropogenic activities with the largest impact on the water health and quality of the river.

scholarly journals Geochemical Variability of Surface Sediment in Post-Mining Lakes Located in the Muskau Arch (Poland) and Its Relation to Water Chemistry

2021 ◽  
Vol 232 (3) ◽  
Author(s):  
Michał Gąsiorowski ◽  
Jacek Stienss ◽  
Elwira Sienkiewicz ◽  
Ilona Sekudewicz
Keyword(s):  
Underground Mining ◽  
Chemical Compositions ◽  
Monte Carlo Test ◽  
Water Parameters ◽  
Ph Values ◽  
Water And Sediment ◽  
Mining Lakes ◽  
Water Ph ◽  
Physical And Chemical ◽  
Chemical Water

AbstractWater and sediment chemical compositions were investigated in 75 post-mining lakes in the eastern part of the Muskau Arch region (Western Poland, Central Europe). The lakes, originating from lignite and clay surfaces and underground mining activity, exhibited a wide gradient of physical and chemical water parameters. The most pronounced variability in water parameters was observed in pH values, conductivity, and oxygen concentration in the mixolimnion and monimolimnion. In addition, the lakes varied in terms of their trophic status, indicated by their dissolved organic carbon (DOC) and phosphorous concentrations. In general, lakes with higher pH values had higher trophic states, and some even exhibited hypertrophic conditions. The Monte Carlo test indicated that the water pH, phosphorus, DOC, and silicon concentrations could significantly explain the chemical characteristics of sediments.

scholarly journals PHYSICAL AND CHEMICAL INVESTIGATION OF THE AUTHENTICITY OF PARACETAMOL

2021 ◽  
pp. 161-166
Author(s):  
Кристина Сергеевна Шачнева ◽  
Надежда Владимировна Баранова ◽  
Мариана Александровна Феофанова
Keyword(s):  
Ir Spectroscopy ◽  
Chemical Investigation ◽  
Medicinal Preparations ◽  
Physical And Chemical

Подтверждено наличие п-ацетаминофена методами спектрофотометрическим и ИК-спектроскопии в лекарственных препаратах. The presence of p-acetaminophen was confirmed by spectrophotometric and IR-spectroscopy methods in medicinal preparations

X. On the chemical and physical conditions of the culture of cotton

1862 ◽  
Vol 11 ◽  
pp. 340-352
Keyword(s):  
North America ◽  
Cotton Plant ◽  
Chemical Investigation ◽  
Indian Government ◽  
Physical Conditions ◽  
The Government ◽  
Physical And Chemical

This communication embraces the first portion of an elaborate physical and chemical investigation, in which the author has been and is still engaged, upon the scientific conditions involved in the success­ful agriculture of the cotton plant. To this train of research he has brought peculiar advantages, holding his professorial chair in the great otton-growing State of Alabama (North America), having been the ditor of the Government Geological Report of that State, and having had placed at his disposal (for experiment and comparison) by the Indian Government, a magnificent collection, specially made, of the various cotton soils and plants of India, as well as the like from other Powers.

A physical and chemical investigation of the nature and properties of the species formed in the Hg(63P1)–CO system

1970 ◽  
Vol 48 (9) ◽  
pp. 1420-1431 ◽  
Author(s):  
G. London ◽  
A. C. Vikis ◽  
D. J. Le Roy
Keyword(s):  
Carbon Monoxide ◽  
Rate Constants ◽  
Chemical Investigation ◽  
Enhancement Effect ◽  
Quenching Rate ◽  
Physical Measurements ◽  
Quenching Process ◽  
Excimer Formation ◽  
Physical And Chemical

An investigation of the Hg(63P1)–CO system by physical measurements (emission, pressure studies) relevant to the reported Hg*CO species have yielded no additional evidence of its formation.Chemical experiments on the decomposition of ethylene and H2 are in accord with formation of a long lived (> 10−5 s) species. The relative quenching rate constants of the species by C2H4, H2, and CO are 1:0.10–0.18:0.023, respectively.The reliability of the "carbon monoxide effect" as a criterion for distinguishing the nature of the quenching process is discussed in the light of a CO enhancement effect (~ 30%) observed in the Hg(63P1) photosensitized decomposition of hydrogen in the presence of CO and at conditions of incomplete quenching. An alternative to Hg*CO excimer formation is also discussed. This approach is based on the possible formation of Hg(63P0) atoms in quantities in excess of those currently accepted, when Hg–CO mixtures are irradiated with 2537 Å light.

scholarly journals Results of the 2006 Sava survey: Aquatic macroinvertebrates

2008 ◽  
Vol 60 (2) ◽  
pp. 265-271 ◽  
Author(s):  
M.M. Paunovic ◽  
Slavica Borkovic ◽  
S.Z. Pavlovic ◽  
Zorica Saicic ◽  
P.D. Cakic
Keyword(s):  
Chemical Properties ◽  
Aquatic Macroinvertebrates ◽  
Physical And Chemical Properties ◽  
Water And Sediment ◽  
Sava River ◽  
Anodonta Woodiana ◽  
Diverse Groups ◽  
Physical And Chemical ◽  
The Sava River ◽  
And Chemical Properties

The paper presents some results of the 2006 Sava survey. The investigation was carried out at four locations along 188 km of the Serbian stretch of the Sava River (206 km of the river belongs to Serbia). Among other things (physical and chemical properties of water and sediment, phytoplankton, and phytobenthos), the study included investigation of aquatic macroinvertebrates. Sixty-two taxa were identified in this typical lowland river. Mollusks and oligochaetes were the most diverse groups of macroinvertebrates. Our results support the hypothesis that the Sava River is an important bio-invasion trajectory, a part of the Southern Invasive Corridor of Europe. Five alien macroinvertebrate taxa were identified, some of which (Corbicula fluminea, Branchyura sowerbyi, and Anodonta woodiana) were found to be important components of the community.

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