scholarly journals Physico-Chemical Features of the Kpassa Reservoir, Northern Benin, with Emphasis on Its Trophic State: A Preliminary Study

2016 ◽  
Vol 07 (13) ◽  
pp. 2067-2080 ◽  
Author(s):  
Ousmane Touré Boukari ◽  
Daouda Mama ◽  
Youssouf Abou ◽  
Moctar Limam Bawa
Keyword(s):  
Trophic State ◽  
Physico Chemical ◽  
Preliminary Study

scholarly journals Preliminary Study on Physico-Chemical Parameters and Phytoplankton of Chiffa River (Blida, Algeria)

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Fella Hamaidi-Chergui ◽  
Mohamed Brahim Errahmani ◽  
Fatouma Benouaklil ◽  
Mohand Said Hamaidi
Keyword(s):  
Water Quality ◽  
Electrical Conductivity ◽  
Organic Matter ◽  
Water Samples ◽  
Chemical Parameters ◽  
North West ◽  
Quality Guidelines ◽  
Physico Chemical ◽  
Preliminary Study ◽  
Monthly Variations

The present study was carried out to determine the monthly variations of physico-chemical parameters in water samples from Chiffa river at Blida, North West of Algeria from April to August 2006. Water samples were analyzed for physico-chemical parameters and the results showed their monthly variations as follows: pH 7.5-7.6, electrical conductivity 0.87–1.06 mS·cm−1, nitrate 0–7.00 mg·L−1, nitrite 0–0.28 mg·L−1, ammonia 0–0.03 mg·L−1, phosphate 0–0.94 mg·L−1, sodium 19.3–47.0 mg·L−1, chloride 35.7–52.0 mg·L−1, calcium 90.3–104.7 mg·L−1, magnesium 27.3–37.7 mg·L−1, organic matter 0.4–3.9 mg·L−1, chlorophyll a 0.7–132.3 mg·L−1, and bicarbonate 219.3–248.7 mg·L−1. The analyzed physico-chemical parameters were almost not exceeded the maximum permissible limit of WHO and Algerian Water Quality Guidelines. A total of 53 taxa belonging to 4 divisions have been identified, including Chlorophyta (52.83% of taxa), Bacillariophyta (28.30%), Cyanophyceae (16.98%), and Charophyta (1.89%).

scholarly journals CONCENTRAÇÃO DE FÓSFORO PRESENTE NOS RECURSOS HÍDRICOS: AVALIAÇÃO DO ÍNDICE DE ESTADO TRÓFICO DO BALNEÁRIO DE QUATÁ-SP

2018 ◽  
Vol 10 (Especial) ◽  
pp. 24-28
Author(s):  
Jaine D’Aurelio Carreira ◽  
Daniel Ângelo Macena ◽  
Jaqueline Nascimento da Silva
Keyword(s):  
Population Health ◽  
Trophic State ◽  
Fish Mortality ◽  
Water Color ◽  
Vegetation Growth ◽  
Standard Methods ◽  
Physico Chemical ◽  
Anthropogenic Action ◽  
Water And Wastewater

Water can undergo natural physico-chemical changes, but it is often caused by anthropogenic action due to improper disposal of effluent. These changes lead to eutrophication, which results in a high index of nutrients such as phosphorus and nitrogen, leading to vegetation growth. Other consequences may be fish mortality, dark water color of water, strong odor and transfer of pathogens, which endangers population health. The present work had as objective to perform analyzes of total phosphorus in the Municipal Spa of Quatá-SP. The method used for the analyzes was Phosphorus with Reactive Orthophosphate, adapted from the Standard Methods for the Examination of Water and Wastewater and the results were compared with the trophic state classes and the parameters of the legislation. At the end of the analyzes, the values obtained from EIT were considered high, compromising the quality of the water in some points.

scholarly journals A New Silver Complex with Ofloxacin – Preliminary Study

2016 ◽  
Vol 62 (2) ◽  
pp. 192-198 ◽  
Author(s):  
Aura Rusu ◽  
Gabriel-Cosmin Popescu ◽  
Silvia Imre ◽  
Valentin Ion ◽  
Szende Vancea ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Chemical Structure ◽  
Chemical Characterization ◽  
Silver Complex ◽  
Stoichiometric Ratio ◽  
Scanning Calorimetry ◽  
Thermal Methods ◽  
Physico Chemical ◽  
Preliminary Study

AbstractObjective: Silver complexes of antibacterial quinolones have the potential advantage of combining the antibacterial activity of silver and fluoroquinolones. The objective of our study was the preparation and the preliminary physico-chemical characterization of a silver complex with ofloxacin.Methods: To achieve our goals several spectroscopic methods (ultraviolet spectrophotometry, mass spectrometry, and Fourier transform infrared spectroscopy) and thermal methods (differential scanning calorimetry and thermogravimetric analysis) were used in order to elucidate the chemical structure of the complex.Results: Using mass spectrometry we established the stoichiometric ratio silver:ofloxacin as 1:2. Experimental data suggest a particular coordination for ofloxacin, as a monodentate ligand, in the formation of a complex with silver, through the nitrogen atom from the methyl-piperazine cycle.Conclusions: The obtained complex has a chemical structure likely [Ag(Ofloxacin)2]NO3, requiring evaluation through other physico-chemical methods.

scholarly journals A Preliminary Study of the Physico-Chemical Parameters and Potential Pollutant Sources in Urban Lake Rawa Besar, Depok, Indonesia

2021 ◽  
Vol 53 (2) ◽  
Author(s):  
Mangapul Parlindungan Tambunan ◽  
Kuswantoro Marko ◽  
Ratna Saraswati ◽  
Rokhmatuloh Rokhmatuloh ◽  
Revi Hernina
Keyword(s):  
Urban Lake ◽  
Chemical Parameters ◽  
Nitrate N ◽  
Physico Chemical ◽  
Physical And Chemical Parameters ◽  
Pollutant Sources ◽  
Water Quality Status ◽  
Preliminary Study ◽  
Physical And Chemical ◽  
Quality Status

Lake Rawa Besar is an urban lake surrounded by dense settlements and commercial areas that are currently experiencing physical and ecological pressures due to uncontrolled land-use change around the lake. Therefore, this preliminary study aimed to investigate the sustainable management of the lake in order to create a recreational destination area. It was carried out by ascertaining the lake water quality status through the analysis of the physical and chemical parameters and identifying the potential pollutant sources due to land use and human activities. The physical parameters include TDS, TSS, Turbidity, while the chemical parameters include Nitrate-N, Total Phosphate-P, and BOD. Furthermore, field surveys on 30 water samples were conducted once at noon and statistical analysis was used to ascertain the correlation between the physical and chemical parameters. Finally, Geographic Information System (GIS) tools were used to investigate the spatial distribution of the Physico-chemical parameters and the potential pollutant sources. The results showed that based on the six parameters of the water quality status, the lake was lightly polluted. It also showed that three parameters such as Turbidity, BOD, and TSS exceed the permissible limit with 93.3, 66.7, 43.7% of the total samples, respectively. Additionally, a strong correlation existed between BOD and Turbidity with r=0.95, while a medium correlation existed between Nitrate-N and Phosphate-P with r=0.40. The spatial distribution of the concentration of the physico-chemical parameters generally had a varied pattern,  however, Turbidity and BOD had a similar pattern, especially in the bank areas. Finally, domestic and organic wastes were indicated as pollutant sources, which increased eutrophication in the lake.

scholarly journals Quality and economic aspects of roofing slates in theTharpu area, Tanahu

1970 ◽  
Vol 14 ◽  
pp. 43-50
Author(s):  
Naba Raj Neupane ◽  
Lalu Prasad Paudel
Keyword(s):  
Economic Aspects ◽  
Lesser Himalaya ◽  
X Ray Diffraction ◽  
Testing Methods ◽  
X Ray ◽  
Physico Chemical ◽  
Standard Values ◽  
Preliminary Study ◽  
Chemical Testing

A preliminary study on the occurrence, quality and economic aspects of the slates was carried in the slate deposits of theTharpu area, west Nepal Lesser Himalaya. The area is covered by the Nourpul Formation, Dhading Dolomite and the BenghatSlates of the Lower Nawakot Group forming a broad synclinal structure. Three deposits of slates were identified in the area atSeratar (Nourpul Formation), Phapardanda (Nourpul Formation) and the Chipliswara (Benighat Slate). Samples from all threedeposits were analyzed by petrographic, X-ray diffraction and Physico-chemical testing methods. The study shows that the slatesare well foliated, splitable into thin and smooth slabs, and physico-chemically close to the ASTM and IS standard values. Thequantity of slate is good enough for mining economically.DOI: http://dx.doi.org/10.3126/bdg.v14i0.5438Bulletin of the Department of Geology Vol.14 2011, pp.43-50 

scholarly journals Preliminary Study to Find Occurrence and Dynamics of Toxic Cyanobacteria in Nuwara wewa and Nachchaduwa wewa, Two Man-made Reservoirs in Sri Lanka

2018 ◽  
Vol 6 (5) ◽  
pp. 179-191
Author(s):  
M.C.M. Zakeel ◽  
P.A. Weerasinghe ◽  
H.C.D. Wijayawardhana ◽  
B.A.D.G. Kumari
Keyword(s):  
Cyanobacterial Bloom ◽  
Aquatic Organisms ◽  
Rrna Gene ◽  
Chemical Parameters ◽  
Toxic Cyanobacteria ◽  
Physico Chemical ◽  
Microcystin Production ◽  
Preliminary Study ◽  
Positive Correlations ◽  
Drinking Purpose

Bloom of cyanobacteria in water bodies causes devastating problems to the ecosystem and humans when they depend on these waters for drinking purpose. Microcystin and nodularin, produced by some cyanobacteria, are toxic for human and many other aquatic organisms. Nuwara wewa and Nachchaduwa wewa are two important reservoirs supplying water for drinking purpose in addition to agricultural use. Therefore, preliminary study was conducted to evaluate these reservoirs for the presence of toxic cyanobacteria and their dynamics is of importance to take proper measures to control cyanobacterial growth and to ensure supply of quality water for human drinking purpose. Water samples were collected for 12 months from both reservoirs and physic-chemicals parameters of water were also recorded. Correlations between the physico-chemical parameters of water and the cyanobacterial density were established. Toxic cyanobacteria were isolated and identified using conventional and molecular methods. 16S rRNA gene and mcy-A gene were targeted for molecular identification using PCR. Cyanobacterial density had strong positive correlations with some physico-chemical parameters such as pH, temperature and dissolved oxygen in both reservoirs. These parameters can be used as good indicators to evaluate the condition these reservoirs with respect to cyanobacterial bloom. Some cyanobacterial isolates recovered from both reservoirs harboured mcy-A gene, showing the potential of microcystin production.

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