Several natural indicators of radial well ageing at the Belgrade Groundwater Source, part 1

Over time, the radial collector wells of the Belgrade Groundwater Source, located in the alluvial sediments of the Sava River, exhibit a decline in discharge and a reduction in operating efficiency due to well ageing. An increase in hydraulic losses at the lateral screens, due to chemical and biochemical clogging, has been identified as the primary cause. Certain hydrogeological, hydrochemical and microbiological parameters reflect the well-ageing process and can, therefore, be considered as its indicators. An indicator-based determination of scale is an important aspect in the selection of appropriate well locations, structural characteristics, and maintenance approaches. Well ageing was studied over a period of 5 years (2005–2009). The objective was to investigate the causes of well ageing. The correlations established between the groundwater redox potential, the total iron concentration in groundwater, the grain-size distribution of the aquifer, and well discharge, are presented in the paper.

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A new approach to the definition of design criteria for radial collector wells in anoxic settings

Geoloski anali Balkanskog poluostrva ◽

10.2298/gabp1879031d ◽

2018 ◽

Vol 79 (1) ◽

pp. 31-45

Author(s):

Milan Dimkic ◽

Milenko Pusic

Keyword(s):

Structural Characteristics ◽

Iron Concentration ◽

3D Analysis ◽

New Approach ◽

Novel Approach ◽

Potential Capacity ◽

Definition Of ◽

Groundwater Source ◽

Radial Collector Well ◽

The Sava River

The outcomes of a study on groundwater flow from a river to a radial collector well are presented in the paper. The considered well, RB-16, is part of a groundwater source that provides water supply to Belgrade (Serbia). The source relies on the alluvial aquifer of the Sava River. The groundwater is mildly anoxic (Eh ~ 125 mV, Fe2+ = 0.46 mg/L, NO3 ~ 0.24 mgN/L, O2 ~ 0.1 mg/L). The paper is specific in the sense that it presents a novel approach to the definition of water well susceptibility to iron incrustation in an anoxic alluvial setting. Maximum permissible screen entrance velocities, as well as the structural characteristics of the horizontal screens and the radial collector well itself, are determined based on correlations established between the rate of well incrustation, redox potential, iron concentration in groundwater, and screen entrance velocities. One of the criteria is that the hydraulic resistances, caused by the precipitation of iron on the horizontal screens, are being lower than specified. The correlations between maximum permissible screen entrance velocities (the velocities that still allow a lower-than-specified increase in local hydraulic resistances at the entrance to the screens) and biochemical indicators (Eh, Fe2+) were taken from previous papers by the same authors and their associates. Original software was used for hydraulic analysis of the potential capacity of the location of well RB-16. The software supports 3D analysis, including boundary conditions, and was adapted for this particular purpose.

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Several natural indicators of radial well ageing at the Belgrade Groundwater Source, part 2

Water Science & Technology ◽

10.2166/wst.2011.564 ◽

2011 ◽

Vol 63 (11) ◽

pp. 2567-2574 ◽

Cited By ~ 3

Author(s):

M. Dimkić ◽

M. Pušić ◽

V. Obradović ◽

D. Djurić

Keyword(s):

Population Growth ◽

Redox Potential ◽

Microbial Population ◽

Iron Concentration ◽

Hydraulic Losses ◽

Research Outcomes ◽

Groundwater Source ◽

Kinetics Of ◽

Radial Well

From 2005 to 2009, research was conducted at the Belgrade Groundwater Source (BGWS) to investigate the process of clogging of wells with horizontal lateral screens (radial wells). The clogging process was monitored via the kinetics of the increase in hydraulic losses at the laterals. A correlation of this process with the redox potential, the iron concentration in water, and the microbial population growth at the laterals and in their immediate vicinity was established. Research outcomes are presented here from a study of five wells where laterals were replaced between 2006 and 2008. Derived dependencies were later used to define the preferred approach to the installation and maintenance of well laterals at the BGWS. Results contribute to the study of well ageing caused by biochemical clogging.

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A Friendly Complexing Agent for Spectrophotometric Determination of Total Iron

Molecules ◽

10.3390/molecules26113071 ◽

2021 ◽

Vol 26 (11) ◽

pp. 3071

Author(s):

Valeria M. Nurchi ◽

Rosita Cappai ◽

Nadia Spano ◽

Gavino Sanna

Keyword(s):

Accurate Determination ◽

Iron Concentration ◽

Total Iron ◽

Analytical Determination ◽

Complexing Agent ◽

Industrial Chemistry ◽

Spectrophotometric Methods ◽

Desferrioxamine B ◽

Control Serum

Iron, one of the most common metals in the environment, plays a fundamental role in many biological as well as biogeochemical processes, which determine its availability in different oxidation states. Its relevance in environmental and industrial chemistry, human physiology, and many other fields has made it necessary to develop and optimize analysis techniques for accurate determination. Spectrophotometric methods are the most frequently applied in the analytical determination of iron in real samples. Taking advantage of the fact that desferrioxamine B, a trihydroxamic acid used since the 1970s in chelation therapy for iron overload treatment, forms a single stable 1:1 complex with iron in whichever oxidation state it can be found, a smart spectrophotometric method for the analytical determination of iron concentration was developed. In particular, the full compliance with the Lambert-Beer law, the range of iron concentration, the influence of pH, and the interference of other metal ions have been taken into account. The proposed method was validated in terms of LoD, LoQ, linearity, precision, and trueness, and has been applied for total iron determination in natural water certified material and in biological reference materials such as control human urine and control serum.

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An Improved Algorithms of Stroke Generation Considering Multi-level Information Quantity

Abstracts of the ICA ◽

10.5194/ica-abs-1-225-2019 ◽

2019 ◽

Vol 1 ◽

pp. 1-2

Author(s):

Yi Liu ◽

Wenjing Li ◽

Zhiyong Lin

Keyword(s):

Road Network ◽

Structural Characteristics ◽

Network Structures ◽

Information Quantity ◽

The Road ◽

Level Information ◽

Feature Information ◽

Multi Level ◽

Selection Of

<p><strong>Abstract.</strong> As a critical component of road network data, stroke has been widely used in analysis and application of road network. However, most conventional stroke generation strategies are based solely on a regular angle threshold, ignoring the structural characteristics of the road network. In fact, map information comes from the diversity and difference of elements and their distribution characteristics. Different road network structures should also correspond to different angle thresholds, rather than a fixed value. Therefore, quantitatively describing the structure characteristics of road network, has an important impact on the determination of the threshold in stroke generation strategies. In this paper, we propose an algorithm of stroke generation based on spatial feature information, which achieves the selection of the optimal threshold under different road network structures.</p>

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Enzyme-labeled immunosorbent assay for serum ferritin: method evaluation and comparison with two radioassays.

Clinical Chemistry ◽

10.1093/clinchem/25.8.1466 ◽

1979 ◽

Vol 25 (8) ◽

pp. 1466-1469 ◽

Cited By ~ 11

Author(s):

R L Fortier ◽

W P McGrath ◽

S L Twomey

Keyword(s):

Immunosorbent Assay ◽

Inverse Relationship ◽

Iron Concentration ◽

Total Iron ◽

Regression Equation ◽

Iron Binding ◽

Method Evaluation ◽

Degree Of Association ◽

Total Iron Concentration

Abstract We report our evaluation of a commercially available procedure and reagents for determination of ferritin in serum by enzyme-labeled immunosorbent assay (ELISA). Results by our procedure and the "Fer Iron" (Ramco Labs) procedure shows a degree of association (r) of 0.95 and a regression equation of y = 1.03x - 33. Similarly, our procedure compared to the "Gamma Dab" (Clinical Assays) ferritin procedure shows a degree of association of 0.98 and a regression equation of y = 0.93x - 11. Between-day standard deviations were 6 and 22 micrograms/L (n = 24 and 20) for ferritin concentrations of 20 and 300 micrograms/L, respectively. Ferritin values showed no correlation with total iron concentration, but show a broad inverse relationship with iron-binding capacities. The favorable correlation with existing procedures and the speed of the analysis commend the use of ELISA for measurement of ferritin in serum.

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Experimental Study on Determination of Total Iron in Water by Automatic Discrete Spectrophotometry

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.807-809.223 ◽

2013 ◽

Vol 807-809 ◽

pp. 223-226

Author(s):

Bing Tao Liu ◽

Peng Ju Ding

Keyword(s):

Experimental Study ◽

Iron Concentration ◽

Absorption Spectrometry ◽

Total Iron ◽

Stable Operation ◽

Recovery Efficiency ◽

Iron Ions ◽

Rapid Measurement ◽

Significant Difference

A new method was introduced for rapid measurement of iron ions in drinking water by automatic discrete spectrophotometry. In the iron concentration range 0-1.5mg/L, the linear relationship was good and the correlation coefficient was 0.9998. The total iron detection of recovery efficiency was 99.94%±1.6% and detection limit was 0.006mg/L and precision of the RSD% was 0.35%. The results show that the method was direct, fast, stable operation and lower iron concentration in water can be accurately detected.There is no significant difference compared with the results of atomic absorption spectrometry methods.

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Systematic procedure for the determination of the nature of the solutes prior to the selection of the mobile phase parameters for optimization of reversed-phase ion-pair chromatographic separations

Journal of Chromatography A ◽

10.1016/s0021-9673(01)84371-5 ◽

1989 ◽

Vol 478 (1) ◽

pp. 21-38 ◽

Cited By ~ 1

Author(s):

G Low

Keyword(s):

Mobile Phase ◽

Reversed Phase ◽

Ion Pair ◽

Chromatographic Separations ◽

Systematic Procedure ◽

Selection Of

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DETERMINING THE DESALINATION UNIT COMPOSITION FOR COSTAL AREAS AND SMALL ISLANDS USE ANALYTIC HIERARCHY PROCESS

Jurnal Rekayasa Lingkungan ◽

10.29122/jrl.v9i1.1986 ◽

2017 ◽

Vol 9 (1) ◽

Author(s):

Imam Setiadi ◽

Dinda Rita K. Hartaja

Keyword(s):

Analytic Hierarchy Process ◽

Energy Demand ◽

Pairwise Comparison ◽

Small Islands ◽

Ahp Method ◽

Analytic Hierarchy ◽

Comparison Research ◽

Hierarchy Process ◽

Selection Of

Selection of the appropriate composition desalination units can be done with a variety of method approaches, one of the method is the Analytic Hierarchy Process. In determining the desalination unit with AHP method to consider is setting a goal, an alternative criteria and pairwise comparison. Research for the determination of the exact composition of the desalination unit in order to achieve sustainable drinking water suppy in coastal areas and small islands has been conducted. The results of the study are as follows, the energy demand of 50.83%, operator costs of 26.64%, maintenance costs of 14.13% and chemical requirement 8.4%. For an alternative composition desalination unit of RO 10 m3 / day is the best alternative composition with value of 59.61%, the composition of the next alternative is RO 20 m3/ day of 30.40% and the last alternative of the desalination unit composition is RO 120 m3/ day of 09.99%.Key words : Desalination, Mukti Stage Flash Composition, AHP

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