scholarly journals Geochemical Markers as a Tool for the Characterization of a Multi-Layer Urban Aquifer: The Case Study of Como (Northern Italy)

Water ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 124
Author(s):  
Gilberto Binda ◽  
Francesca Frascoli ◽  
Davide Spanu ◽  
Maria F. Ferrario ◽  
Silvia Terrana ◽  
...  
Keyword(s):  
Water Quality ◽  
Natural Water ◽  
Tectonic Setting ◽  
Northern Italy ◽  
Sediment Geochemistry ◽  
Factors Affecting ◽  
Deep Aquifers ◽  
Geochemical Markers ◽  
Main Factors

The analysis of geochemical markers is a known valid tool to explore the water sources and understand the main factors affecting natural water quality, which are known issues of interest in environmental science. This study reports the application of geochemical markers to characterize and understand the recharge areas of the multi-layer urban aquifer of Como city (northern Italy). This area presents a perfect case study to test geochemical markers: The hydrogeological setting is affected by a layered karst and fractured aquifer in bedrock, a phreatic aquifer hosted in Holocene sediments and connected with a large freshwater body (Lake Como); the aquifers recharge areas and the water geochemistry are unknown; the possible effect of the tectonic setting on water flow was overlooked. In total, 37 water samples were collected including water from two stacked aquifers and surface water to characterize hydrochemical features. Moreover, six sediment samples in the recent palustrine deposits of the Como subsurface were collected from cores and analyzed to understand the main geochemistry and mineralogy of the hosting material. The chemical analyses of water allow to observe a remarkable difference between the shallow and deep aquifers of the study area, highlighting different recharge areas, as well as a different permanence time in the aquifers. The sediment geochemistry, moreover, confirms the differences in trace elements derived from sediment-water interaction in the aquifers. Finally, an anomalous concentration of As in the Como deep aquifer was observed, suggesting the need of more detailed analyses to understand the origin of this element in water. This study confirms the potentials of geochemical markers to characterize main factors affecting natural water quality, as well as a tool for the reconstruction of recharge areas.

scholarly journals Implications of water hardness in ecotoxicological assessments for water quality regulatory purposes: a case study with the aquatic snail Biomphalaria glabrata (Say, 1818)

2014 ◽  
Vol 74 (1) ◽  
pp. 175-180 ◽  
Author(s):  
EC Oliveira-Filho ◽  
NR Caixeta ◽  
NCS Simplício ◽  
SR Sousa ◽  
TP Aragão ◽  
...  
Keyword(s):  
Water Quality ◽  
Natural Water ◽  
Water Hardness ◽  
Biomphalaria Glabrata ◽  
Water Quality Monitoring ◽  
Freshwater Snail ◽  
Survival And Reproduction ◽  
Testing Medium ◽  
Different Levels

Water hardness is a property depending on the presence of alkaline earth metals, mainly calcium and magnesium. Among the strategies for water quality monitoring, ecotoxicological assays are performed to minimize impacts and classify water bodies. For these laboratory evaluations parameters are previously defined in the guidelines, including water hardness for both cultivation and testing medium. The present work was performed to evaluate the effects of different levels of water hardness on the survival and reproduction of the freshwater snail Biomphalaria glabrata and discuss the influence of natural water hardness on the results of ecotoxicological tests with these environmental samples. Comparing the groups it was possible to observe that those maintained in waters with least hardness had lower reproductive success, while the groups maintained in highest hardness showed better reproduction. These data show that waters with low hardness make the reproduction of the snail B. glabrata unfeasible, and this reveal a problem for ecotoxicity assays using natural water samples.

scholarly journals An Analysis on the Factors Affecting Credit Selection In BPR to Increase Competitiveness (BPR Case Study in Surabaya)

2020 ◽  
Vol 4 (2) ◽  
pp. 159
Author(s):  
Nobertus Purnomo Lastu ◽  
Werner Ria Murhadi ◽  
Ratna Widyanti W
Keyword(s):  
Financial Institutions ◽  
Commercial Banks ◽  
Commercial Banking ◽  
Competitive Advantages ◽  
Factors Affecting ◽  
Determinant Factors ◽  
Factors Influencing ◽  
Logistic Method ◽  
Main Factors

Bank Perkreditan Rakyat (BPR) is part of  the  banking  financial institutions  apart from the commercial  banking. .One of the activities of the BPR is to distribute the credits as done by the commercial banks. Problems. BPR as micro financial institutions, in doing their business to  distribute  the credit up to certain amount, are faced with  the  commercial banks  which  have more  competitive advantages, both in the price  and facilities provided. Objective of this research is to identify the factors influencing the customers in making decisions to take the credit at BPR. By identifying the determinant factors in choosing the banks, BPR can use it to improve their services to the customers and at the same time BPR can use it as a strategy in  giving credit to the customers or debtors. The metode employed in this study was regressive logistic method, which was  used to  identify  what factors determine the customers to choose credit at BPR. The conclusion is that the procedures and personality of staff are the main factors making the customers choose credit at BPR

scholarly journals The water quality of streams located in large urban agglomeration, case study of the SłuŻewiecki Stream

2018 ◽  
Vol 44 ◽  
pp. 00193 ◽  
Author(s):  
Małgorzata Wojtkowska ◽  
Magdalena Matula ◽  
Paulina Kozińska
Keyword(s):  
Water Quality ◽  
Field Research ◽  
Capital City ◽  
Factors Affecting ◽  
Urbanized Area ◽  
Poor Water Quality ◽  
The Subject ◽  
The One

The quality assessment of watercourse, located in a highly urbanized area was the goal of research. The SłuŻewiecki Stream, which flows in the southern part of the capital city of Warsaw is the subject of study. The aim of the research was to determine the tendency of the water quality changes in the SłuŻewiecki Stream, flowing in the highly urbanized area and being a sink of the non-point and industry sources of pollutions as well as the surface runoffs which comes from its catchment. The field research was conducted along the entire length of the stream in 2015 and 2016. The water samples were collected monthly from a depth to 20 cm. Water quality tests were carried out in accordance with the valid analytical methods. The obtained results point to poor water quality. Therefore it can be conducted that the development and use of the direct catchment is the one of main factors affecting the water quality in SłuŻewiecki Stream. The tributaries, often not inventoried, from built-up, populated areas, are the most polluted. Tributaries contain large amount of organic compounds and nutrients.

scholarly journals Water Quality Assessment of a Meromictic Lake Based on Physicochemical Parameters and Strontium Isotopes (87Sr/86Sr) Analysis: A Case Study of Lubińskie Lake (Western Poland)

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2231 ◽  
Author(s):  
Mateusz Zieliński ◽  
Anna Szczucińska ◽  
Mateusz Drożdżyński ◽  
Marcin Frankowski ◽  
Andrzej Pukacz
Keyword(s):  
Water Quality ◽  
Strontium Isotopes ◽  
Water Quality Assessment ◽  
Physicochemical Analysis ◽  
Secondary Importance ◽  
Deep Aquifers ◽  
Nitrogen Concentrations ◽  
Content Support ◽  
The Relationship

In 2017, hydrochemical surveys of meromictic Lubińskie Lake (W Poland) and its water inflows were carried out. The lake experienced complete mixing in 2008 due to a series of orkan winds, and since 2015, intensifying worsening of water quality in the lake has been observed. Our aim was to determine the degree of transformation of Lubińskie Lake based on water chemistry and to identify the source of pollution of the lake using strontium isotopes (87Sr/86Sr) as a new chemical tracking tool. The physicochemical analysis confirmed the meromictic character of the lake. The comparison with previous studies (2003 and 2008) showed significant year-to-year differentiation, indicating intensifying eutrophication of the lake’s water, both in the epilimnion and the hypolimnion. Nine spring niches, directly supplying the lake, provide water with very high phosphorus and nitrogen concentrations (up to 10 kg of nitrogen and 0.9 kg of phosphorus daily). The strontium isotopes (87Sr/86Sr) analysis indicated that the lake’s water was supplied mostly by the springs, and recharge from deep aquifers is of secondary importance. Moreover, strontium isotope data and the relationship between Sr and Cl content support the finding that the high load of nutrients is of anthropogenic origin and reaches the lake through springs.

scholarly journals Student Perceptions of the Fairness of Video Presentation Grading in the Online EFL Classroom

STEM Journal ◽  
2021 ◽  
Vol 22 (4) ◽  
pp. 27-38
Author(s):  
Charles Copeland
Keyword(s):  
Student Perceptions ◽  
Technology Use ◽  
Qualitative Case Study ◽  
Preparation Time ◽  
Factors Affecting ◽  
Playing Field ◽  
Negative Perceptions ◽  
Main Factors ◽  
Video Presentations

This qualitative case study, which employed thematic analysis, explores student perceptions about the fairness of grading video presentations in an online EFL Korean classroom. The study surveyed 145 students about their attitudes towards the fairness of grading for video presentations using three open-ended questions. To better understand the students’ thoughts, they were asked what most affected the fairness of grading live versus video presentations. It found that students believed that the use of video presentations in the required classroom was fair. The students cited a clear, understandable rubric, hard work resulting in the deserved grade, the best material could be submitted, the video could demonstrate ability without nerves, and the teachers’ grading as reasons the grading was deemed fair. There were also some negative perceptions related to the fairness of grading. The two registered were using cheats and not having a fair playing field in terms of technology. The study also found that the main factors affecting video versus live presentations were the fear of live presentations, preparation time, technology use, and the teachers’ grading. The results from the survey indicated that student-produced video presentations should be considered in the future.

scholarly journals Analysis of Factors Affecting Consumers in UHT Milk Consumption: The Case Study of Erzurum

2018 ◽  
Vol 6 (10) ◽  
pp. 1485
Author(s):  
Ahmet Semih Uzundumlu ◽  
Avni Birinci ◽  
Seval Kurtoğlu
Keyword(s):  
Cluster Analysis ◽  
Factor Analysis ◽  
Consumer Preferences ◽  
Primary Data ◽  
Milk Consumption ◽  
Factor Scores ◽  
Factors Affecting ◽  
Uht Milk ◽  
Main Factors

The primary purpose of this study was to determine factors influencing consumer preferences for UHT milk consumption in Erzurum province. The primary data used in this research was derived from Palandoken, Yakutiye and Aziziye districts of Erzurum province in 2010. The factor analysis was used to find out the factors affecting consumer preferences for UHT milk and to reduce these factors. As for the segmentation of consumers and bringing out the profile of each segment, cluster analysis was used. According to the results, 95.00% of households consumed UHT milk. 18 factors that are affecting the consumption of UHT milk were reduced to five main factors with factor analysis. The factor scores which determined with factor analysis were divided into three clusters by cluster analysis. UHT milk for consumers entering the first cluster has because of homogenous and packaging as well as intrinsic and extrinsic properties for advertising and price advantage is preferred. UHT milk for consumers entering the second cluster has ease of preparation and transportation, and confidential properties are preferred by reason. On the contrary, consumers entering the third cluster prefer to UHT milk for a good diet product.

scholarly journals Dynamic integrated water quality modelling: A case study of the Lambro River, northern Italy

Water SA ◽  
2019 ◽  
Vol 33 (5) ◽  
Author(s):  
L. Benedetti ◽  
J. Meirlaen ◽  
F. Sforzi ◽  
A. Facchi ◽  
C. Gandolfi ◽  
...  
Keyword(s):  
Water Quality ◽  
Northern Italy ◽  
Water Quality Modelling
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