The Experts below are selected from a list of 1983 Experts worldwide ranked by ideXlab platform
Vasil Simeonov - One of the best experts on this subject based on the ideXlab platform.
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Hasse Diagram as a green analytical metrics tool ranking of methods for benzo a pyrene determination in sediments
Analytical and Bioanalytical Chemistry, 2016Co-Authors: Paulina Bigus, Stefan Tsakovski, Vasil Simeonov, Jacek Namieśnik, Marek TobiszewskiAbstract:This study presents an application of the Hasse Diagram technique (HDT) as the assessment tool to select the most appropriate analytical procedures according to their greenness or the best analytical performance. The dataset consists of analytical procedures for benzo[a]pyrene determination in sediment samples, which were described by 11 variables concerning their greenness and analytical performance. Two analyses with the HDT were performed—the first one with metrological variables and the second one with “green” variables as input data. Both HDT analyses ranked different analytical procedures as the most valuable, suggesting that green analytical chemistry is not in accordance with metrology when benzo[a]pyrene in sediment samples is determined. The HDT can be used as a good decision support tool to choose the proper analytical procedure concerning green analytical chemistry principles and analytical performance merits.
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Hasse Diagram technique contributions to environmental risk assessment
2014Co-Authors: Stefan Tsakovski, Vasil SimeonovAbstract:This chapter deals with the successive application of self-organizing map (SOM) classification and Hasse Diagram technique (HDT) as chemometric tools for assessment of river water and sediment quality. Both studies are carried out by using long-term water quality monitoring data from the Struma River catchment, Bulgaria and lake sediment samples from Mar Menor lagoon in Spain. The advantages of the SOM algorithm for advanced visualization and classification of large datasets are used for proper selection of chemical parameters being most effective in quality assessment combined with some state directives for surface water quality parameters in the river water study and as preprocessing procedure of the initial sediment data matrix. The simultaneous application of the SOM methodology or legislation norms with Hasse Diagram technique allows to visualize the spatial and temporal evolution of water quality parameters or to reveal specific sediment pollution patterns.
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ranking of ecotoxisity tests for underground water assessment using the Hasse Diagram technique
Chemosphere, 2014Co-Authors: Blazej Kudlak, Stefan Tsakovski, Vasil Simeonov, Lidia Wolska, Agnieszka Sagajdakow, Jacek NamieśnikAbstract:Abstract The present study deals with the novel application of the Hasse Diagram technique (HDT) for the specific ranking of ecotoxicity tests capable of assessment of underground water quality. The area studied is a multi-municipal landfill in the northern Poland. The monitoring network of the landfill constitutes of 27 piezometers for underground water monitoring and two observation points at surface water courses. After sampling, chemical analysis of various water parameters was performed (pH, conductivity, temperature, turbidity (TURB), color, taste, smell and atmospheric conditions: temperature, precipitation and cloud cover, heavy metals content (Cu, Zn, Pb, Cd, Cr 6+ , Hg), total organic carbon (TOC), sum of Polycyclic Aromatic Hydrocarbons (PAHs), Na, Mg, K, Ca, Mn, Fe, Ni, alkalinity (Alkal), general hardness, total suspended matter (SUSP), Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), chlorides, fluorides, sulphides, sulphates, ammonium nitrogen, total nitrogen, nitrate and nitrite nitrogen, volatile phenols, ether extracts (ETHER), dry residues (DRY_RES), dissolved compounds). Parallel to the chemical parameters assessment six different ecotoxicity tests were applied (% root length(PG)/germination(PR) inhibition of Sorghum saccharatum (respectively PGSS/PRSS) , Sinapis alba (respectively PGSA/PRSA) , Lepidium sativum (respectively PGLS/PRLS) , % bioluminescence inhibition of Vibrio fischeri (MT) , % mortality of Daphnia magna (DM) , % mortality of Thamnocephalus platyrus (TN)). In order to determine the applicability of the various ecotoxicity tests, a ranking of samples from different monitoring levels according to the test used (attributes) is done by using HDT. Further, the sensitivity of the biotests was determined and compared. From the sensitivity analysis of the both monitoring levels was evident that the choice of ecotoxicity tests could be optimized by the use of HDT strategy. Most reliable results could be expected by the application of root growth inhibition of Sorghum saccharatum (PGSS test). In order to clarify the relationship between the chemical parameters measured and each of the ecotoxicity tests a optimized similarity analysis between Hasse Diagrams for the ecotoxicity tests for different levels of monitoring and Hasse Diagrams obtained by the use of the chemical parameters was performed. Finally, it could be concluded that for reliable monitoring of underground waters passing a dump collector following chemical parameters are of significance: water hardness, dissolved matter, total nitrogen (ammonia and nitrate nitrogen), nickel, chlorides, alkalinity, total organic carbon and ether extract and the proper battery test could include PGSA, PGSS and PRSS.
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Hasse Diagram technique as a tool for water quality assessment
Analytica Chimica Acta, 2013Co-Authors: Tsvetomil Voyslavov, Stefan Tsakovski, Vasil SimeonovAbstract:Abstract The management of the quality large water catchments is a complex problem which requires intelligent data analysis on various levels – analytical, spatial, and temporal. Recently, a successful approach is developed combining advanced multivariate data treatment approaches like self-organizing maps of Kohonen (SOM) and Hasse Diagram technique (HDT). In the first step of the environmetric analysis the monitoring data were subject to pre-processing using SOMs to reduce the number of objects and/or water quality parameters. In the next step HDT for partial ranking (both in spatial and temporal aspect) was applied according to the pre-selected set of the water quality parameters. The use of the water quality norms issued by the Bulgarian environmental authorities revealed important details in assessing the Maritsa River water quality. Thus, the relations between different water quality patterns and sampling stations could be used by water management authorities during the period of observation.
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surface water quality assessment using self organizing maps and Hasse Diagram technique
Chemometrics and Intelligent Laboratory Systems, 2012Co-Authors: Tsvetomil Voyslavov, Stefan Tsakovski, Vasil SimeonovAbstract:Abstract The present study deals with the important issue of assessing surface water quality by the use of advanced multivariate data treatment approaches like self-organizing maps of Kohonen (SOM) and Hasse Diagram technique (HDT). The object of the study is the catchment of the transboundary Mesta River on Bulgarian territory. Long-term monitoring data (1990–2009) were collected from all sampling sites along the river flow involving all major surface water quality parameters. The clustering of the data by the use of SOM has helped in their pre-processing for application of the HDT approach for ordering the sampling points according to the pre-selected set of water quality parameters describing the ecological status of the river in most reliable way. The ordering was obtained by the use of water quality norms according to the Bulgarian environmental legislation in order to assess in detail the water quality of the whole river system. Thus, the combination between two chemometric data treatment strategies and the national water quality norms made it possible to achieve a complete surface water quality expertise.
Stefan Tsakovski - One of the best experts on this subject based on the ideXlab platform.
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Hasse Diagram as a green analytical metrics tool ranking of methods for benzo a pyrene determination in sediments
Analytical and Bioanalytical Chemistry, 2016Co-Authors: Paulina Bigus, Stefan Tsakovski, Vasil Simeonov, Jacek Namieśnik, Marek TobiszewskiAbstract:This study presents an application of the Hasse Diagram technique (HDT) as the assessment tool to select the most appropriate analytical procedures according to their greenness or the best analytical performance. The dataset consists of analytical procedures for benzo[a]pyrene determination in sediment samples, which were described by 11 variables concerning their greenness and analytical performance. Two analyses with the HDT were performed—the first one with metrological variables and the second one with “green” variables as input data. Both HDT analyses ranked different analytical procedures as the most valuable, suggesting that green analytical chemistry is not in accordance with metrology when benzo[a]pyrene in sediment samples is determined. The HDT can be used as a good decision support tool to choose the proper analytical procedure concerning green analytical chemistry principles and analytical performance merits.
-
Hasse Diagram technique contributions to environmental risk assessment
2014Co-Authors: Stefan Tsakovski, Vasil SimeonovAbstract:This chapter deals with the successive application of self-organizing map (SOM) classification and Hasse Diagram technique (HDT) as chemometric tools for assessment of river water and sediment quality. Both studies are carried out by using long-term water quality monitoring data from the Struma River catchment, Bulgaria and lake sediment samples from Mar Menor lagoon in Spain. The advantages of the SOM algorithm for advanced visualization and classification of large datasets are used for proper selection of chemical parameters being most effective in quality assessment combined with some state directives for surface water quality parameters in the river water study and as preprocessing procedure of the initial sediment data matrix. The simultaneous application of the SOM methodology or legislation norms with Hasse Diagram technique allows to visualize the spatial and temporal evolution of water quality parameters or to reveal specific sediment pollution patterns.
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ranking of ecotoxisity tests for underground water assessment using the Hasse Diagram technique
Chemosphere, 2014Co-Authors: Blazej Kudlak, Stefan Tsakovski, Vasil Simeonov, Lidia Wolska, Agnieszka Sagajdakow, Jacek NamieśnikAbstract:Abstract The present study deals with the novel application of the Hasse Diagram technique (HDT) for the specific ranking of ecotoxicity tests capable of assessment of underground water quality. The area studied is a multi-municipal landfill in the northern Poland. The monitoring network of the landfill constitutes of 27 piezometers for underground water monitoring and two observation points at surface water courses. After sampling, chemical analysis of various water parameters was performed (pH, conductivity, temperature, turbidity (TURB), color, taste, smell and atmospheric conditions: temperature, precipitation and cloud cover, heavy metals content (Cu, Zn, Pb, Cd, Cr 6+ , Hg), total organic carbon (TOC), sum of Polycyclic Aromatic Hydrocarbons (PAHs), Na, Mg, K, Ca, Mn, Fe, Ni, alkalinity (Alkal), general hardness, total suspended matter (SUSP), Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), chlorides, fluorides, sulphides, sulphates, ammonium nitrogen, total nitrogen, nitrate and nitrite nitrogen, volatile phenols, ether extracts (ETHER), dry residues (DRY_RES), dissolved compounds). Parallel to the chemical parameters assessment six different ecotoxicity tests were applied (% root length(PG)/germination(PR) inhibition of Sorghum saccharatum (respectively PGSS/PRSS) , Sinapis alba (respectively PGSA/PRSA) , Lepidium sativum (respectively PGLS/PRLS) , % bioluminescence inhibition of Vibrio fischeri (MT) , % mortality of Daphnia magna (DM) , % mortality of Thamnocephalus platyrus (TN)). In order to determine the applicability of the various ecotoxicity tests, a ranking of samples from different monitoring levels according to the test used (attributes) is done by using HDT. Further, the sensitivity of the biotests was determined and compared. From the sensitivity analysis of the both monitoring levels was evident that the choice of ecotoxicity tests could be optimized by the use of HDT strategy. Most reliable results could be expected by the application of root growth inhibition of Sorghum saccharatum (PGSS test). In order to clarify the relationship between the chemical parameters measured and each of the ecotoxicity tests a optimized similarity analysis between Hasse Diagrams for the ecotoxicity tests for different levels of monitoring and Hasse Diagrams obtained by the use of the chemical parameters was performed. Finally, it could be concluded that for reliable monitoring of underground waters passing a dump collector following chemical parameters are of significance: water hardness, dissolved matter, total nitrogen (ammonia and nitrate nitrogen), nickel, chlorides, alkalinity, total organic carbon and ether extract and the proper battery test could include PGSA, PGSS and PRSS.
-
Hasse Diagram technique as a tool for water quality assessment
Analytica Chimica Acta, 2013Co-Authors: Tsvetomil Voyslavov, Stefan Tsakovski, Vasil SimeonovAbstract:Abstract The management of the quality large water catchments is a complex problem which requires intelligent data analysis on various levels – analytical, spatial, and temporal. Recently, a successful approach is developed combining advanced multivariate data treatment approaches like self-organizing maps of Kohonen (SOM) and Hasse Diagram technique (HDT). In the first step of the environmetric analysis the monitoring data were subject to pre-processing using SOMs to reduce the number of objects and/or water quality parameters. In the next step HDT for partial ranking (both in spatial and temporal aspect) was applied according to the pre-selected set of the water quality parameters. The use of the water quality norms issued by the Bulgarian environmental authorities revealed important details in assessing the Maritsa River water quality. Thus, the relations between different water quality patterns and sampling stations could be used by water management authorities during the period of observation.
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surface water quality assessment using self organizing maps and Hasse Diagram technique
Chemometrics and Intelligent Laboratory Systems, 2012Co-Authors: Tsvetomil Voyslavov, Stefan Tsakovski, Vasil SimeonovAbstract:Abstract The present study deals with the important issue of assessing surface water quality by the use of advanced multivariate data treatment approaches like self-organizing maps of Kohonen (SOM) and Hasse Diagram technique (HDT). The object of the study is the catchment of the transboundary Mesta River on Bulgarian territory. Long-term monitoring data (1990–2009) were collected from all sampling sites along the river flow involving all major surface water quality parameters. The clustering of the data by the use of SOM has helped in their pre-processing for application of the HDT approach for ordering the sampling points according to the pre-selected set of water quality parameters describing the ecological status of the river in most reliable way. The ordering was obtained by the use of water quality norms according to the Bulgarian environmental legislation in order to assess in detail the water quality of the whole river system. Thus, the combination between two chemometric data treatment strategies and the national water quality norms made it possible to achieve a complete surface water quality expertise.
Tsvetomil Voyslavov - One of the best experts on this subject based on the ideXlab platform.
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Hasse Diagram technique as a tool for water quality assessment
Analytica Chimica Acta, 2013Co-Authors: Tsvetomil Voyslavov, Stefan Tsakovski, Vasil SimeonovAbstract:Abstract The management of the quality large water catchments is a complex problem which requires intelligent data analysis on various levels – analytical, spatial, and temporal. Recently, a successful approach is developed combining advanced multivariate data treatment approaches like self-organizing maps of Kohonen (SOM) and Hasse Diagram technique (HDT). In the first step of the environmetric analysis the monitoring data were subject to pre-processing using SOMs to reduce the number of objects and/or water quality parameters. In the next step HDT for partial ranking (both in spatial and temporal aspect) was applied according to the pre-selected set of the water quality parameters. The use of the water quality norms issued by the Bulgarian environmental authorities revealed important details in assessing the Maritsa River water quality. Thus, the relations between different water quality patterns and sampling stations could be used by water management authorities during the period of observation.
-
surface water quality assessment using self organizing maps and Hasse Diagram technique
Chemometrics and Intelligent Laboratory Systems, 2012Co-Authors: Tsvetomil Voyslavov, Stefan Tsakovski, Vasil SimeonovAbstract:Abstract The present study deals with the important issue of assessing surface water quality by the use of advanced multivariate data treatment approaches like self-organizing maps of Kohonen (SOM) and Hasse Diagram technique (HDT). The object of the study is the catchment of the transboundary Mesta River on Bulgarian territory. Long-term monitoring data (1990–2009) were collected from all sampling sites along the river flow involving all major surface water quality parameters. The clustering of the data by the use of SOM has helped in their pre-processing for application of the HDT approach for ordering the sampling points according to the pre-selected set of water quality parameters describing the ecological status of the river in most reliable way. The ordering was obtained by the use of water quality norms according to the Bulgarian environmental legislation in order to assess in detail the water quality of the whole river system. Thus, the combination between two chemometric data treatment strategies and the national water quality norms made it possible to achieve a complete surface water quality expertise.
Amos Bick - One of the best experts on this subject based on the ideXlab platform.
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boron removal from seawater reverse osmosis permeate a Hasse Diagram analysis of current technologies
Desalination, 2013Co-Authors: Amos Bick, Gideon OronAbstract:The high demands for desalination of seawater in the past few years have forced manufacturers to evaluate new potential technologies for boron removal. This work examines the production options by the analytic hierarchy process (AHP) model. According to the AHP model and the Hasse Diagram technique, derived from the theory of partially ordered sets, the permeate split and the use of ion-exchange in series is an open new area for a new expertise.
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assessment of the intake and the pretreatment design in existing seawater reverse osmosis swro plants by Hasse Diagram technique hdt
Clean-soil Air Water, 2011Co-Authors: Rainer Bruggemann, Amos Bick, Gideon OronAbstract:Seawater desalination is a rising technology intended to overcome water scarcity and is increasingly being used for the production of drinking water. A good quality pretreatment process is prominent to the successful operation of a Seawater Reverse Osmosis (SWRO) plant. The tasks of the intake and the pretreatment modules are to prevent fouling and to extend the lifetime of the reverse osmosis membranes. To practice the method of assessment design, 19 seawater plants with 11 different design strategies have been evaluated. The assessed strategies consist of: (i) Intake treatment, (ii) pretreatment aid (coagulation, flocculation, clarification), and (iii) pretreatment unit. Every possible combination of the design elements has been evaluated by a set of 15 attributes. The comparative evaluation has been conducted by Hasse Diagram technique (HDT) using PyHasse software. The result of the HDT application includes 7 favorable incomparable design strategies. In order to solve the incomparability, the Condorcet–Kemeny–Young–Levenglick (C–K–Y–L) ranking procedure was additionally used and rendered the optimal design that is based on subsurface intake and membrane (ultrafiltration) pretreatment facilities. According to the results, both mathematical methods, i.e., the HDT in combination with the C–K–Y–L, procedure can be powerful and helpful tools to assist decisions concerning design strategies.
Gideon Oron - One of the best experts on this subject based on the ideXlab platform.
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boron removal from seawater reverse osmosis permeate a Hasse Diagram analysis of current technologies
Desalination, 2013Co-Authors: Amos Bick, Gideon OronAbstract:The high demands for desalination of seawater in the past few years have forced manufacturers to evaluate new potential technologies for boron removal. This work examines the production options by the analytic hierarchy process (AHP) model. According to the AHP model and the Hasse Diagram technique, derived from the theory of partially ordered sets, the permeate split and the use of ion-exchange in series is an open new area for a new expertise.
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assessment of the intake and the pretreatment design in existing seawater reverse osmosis swro plants by Hasse Diagram technique hdt
Clean-soil Air Water, 2011Co-Authors: Rainer Bruggemann, Amos Bick, Gideon OronAbstract:Seawater desalination is a rising technology intended to overcome water scarcity and is increasingly being used for the production of drinking water. A good quality pretreatment process is prominent to the successful operation of a Seawater Reverse Osmosis (SWRO) plant. The tasks of the intake and the pretreatment modules are to prevent fouling and to extend the lifetime of the reverse osmosis membranes. To practice the method of assessment design, 19 seawater plants with 11 different design strategies have been evaluated. The assessed strategies consist of: (i) Intake treatment, (ii) pretreatment aid (coagulation, flocculation, clarification), and (iii) pretreatment unit. Every possible combination of the design elements has been evaluated by a set of 15 attributes. The comparative evaluation has been conducted by Hasse Diagram technique (HDT) using PyHasse software. The result of the HDT application includes 7 favorable incomparable design strategies. In order to solve the incomparability, the Condorcet–Kemeny–Young–Levenglick (C–K–Y–L) ranking procedure was additionally used and rendered the optimal design that is based on subsurface intake and membrane (ultrafiltration) pretreatment facilities. According to the results, both mathematical methods, i.e., the HDT in combination with the C–K–Y–L, procedure can be powerful and helpful tools to assist decisions concerning design strategies.
