TY  - JOUR
AU  - Marković, Dana D.
AU  - Lekić, Branislava
AU  - Rajaković-Ognjanović, Vladana
AU  - Onjia, Antonije
AU  - Rajaković, Ljubinka V.
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/622
AB  - Numerous regression approaches to isotherm parameters estimation appear in the literature. The real insight into the proper modeling pattern can be achieved only by testing methods on a very big number of cases. Experimentally, it cannot be done in a reasonable time, so the Monte Carlo simulation method was applied. The objective of this paper is to introduce and compare numerical approaches that involve different levels of knowledge about the noise structure of the analytical method used for initial and equilibrium concentration determination. Six levels of homoscedastic noise and five types of heteroscedastic noise precision models were considered. Performance of the methods was statistically evaluated based on median percentage error and mean absolute relative error in parameter estimates. The present study showed a clear distinction between two cases. When equilibrium experiments are performed only once, for the homoscedastic case, the winning error function is ordinary least squares, while for the case of heteroscedastic noise the use of orthogonal distance regression or Margart's percent standard deviation is suggested. It was found that in case when experiments are repeated three times the simple method of weighted least squares performed as well as more complicated orthogonal distance regression method.
T2  - Scientific World Journal
T1  - A New Approach in Regression Analysis for Modeling Adsorption Isotherms
DO  - 10.1155/2014/930879
ER  - 

@article{
author = "Marković, Dana D. and Lekić, Branislava and Rajaković-Ognjanović, Vladana and Onjia, Antonije and Rajaković, Ljubinka V.",
year = "2014",
abstract = "Numerous regression approaches to isotherm parameters estimation appear in the literature. The real insight into the proper modeling pattern can be achieved only by testing methods on a very big number of cases. Experimentally, it cannot be done in a reasonable time, so the Monte Carlo simulation method was applied. The objective of this paper is to introduce and compare numerical approaches that involve different levels of knowledge about the noise structure of the analytical method used for initial and equilibrium concentration determination. Six levels of homoscedastic noise and five types of heteroscedastic noise precision models were considered. Performance of the methods was statistically evaluated based on median percentage error and mean absolute relative error in parameter estimates. The present study showed a clear distinction between two cases. When equilibrium experiments are performed only once, for the homoscedastic case, the winning error function is ordinary least squares, while for the case of heteroscedastic noise the use of orthogonal distance regression or Margart's percent standard deviation is suggested. It was found that in case when experiments are repeated three times the simple method of weighted least squares performed as well as more complicated orthogonal distance regression method.",
journal = "Scientific World Journal",
title = "A New Approach in Regression Analysis for Modeling Adsorption Isotherms",
doi = "10.1155/2014/930879"
}

Marković, D. D., Lekić, B., Rajaković-Ognjanović, V., Onjia, A.,& Rajaković, L. V.. (2014). A New Approach in Regression Analysis for Modeling Adsorption Isotherms. in Scientific World Journal.
https://doi.org/10.1155/2014/930879

Marković DD, Lekić B, Rajaković-Ognjanović V, Onjia A, Rajaković LV. A New Approach in Regression Analysis for Modeling Adsorption Isotherms. in Scientific World Journal. 2014;.
doi:10.1155/2014/930879 .

Marković, Dana D., Lekić, Branislava, Rajaković-Ognjanović, Vladana, Onjia, Antonije, Rajaković, Ljubinka V., "A New Approach in Regression Analysis for Modeling Adsorption Isotherms" in Scientific World Journal (2014),
https://doi.org/10.1155/2014/930879 . .

TY  - JOUR
AU  - Lekić, Branislava
AU  - Marković, Dana D.
AU  - Rajaković-Ognjanović, Vladana
AU  - Đukić, Aleksandar
AU  - Rajaković, Ljubinka V.
PY  - 2013
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/531
AB  - In this study, removal of arsenic ions using two industrial by-products as adsorbents is represented. Removal of As(III) and As(V) from water was carried out with industrial by-products: residual from the groundwater treatment process, iron-manganese oxide coated sand (IMOCS), and blast furnace slag from steel production (BFS), both inexpensive and locally available. In addition, the BFS was modified in order to minimise its deteriorating impact on the initial water quality. Kinetic and equilibrium studies were carried out using batch and fixed-bed column adsorption techniques under the conditions that are likely to occur in real water treatment systems. To evaluate the application for real groundwater treatment, the capacities of the selected materials were further compared to those exhibited by commercial sorbents, which were examined under the same experimental conditions. IMOCS was found to be a good and inexpensive sorbent for arsenic, while BFS and modified slag showed the highest affinity towards arsenic. All examined waste materials exhibited better sorption performances for As(V). The maximum sorption capacity in the batch reactor was obtained for blast furnace slag, 4040 mu gAs(V)/g.
PB  - Hindawi Limited
T2  - Journal of Chemistry
T1  - Arsenic Removal from Water Using Industrial By-Products
DO  - 10.1155/2013/121024
ER  - 

@article{
author = "Lekić, Branislava and Marković, Dana D. and Rajaković-Ognjanović, Vladana and Đukić, Aleksandar and Rajaković, Ljubinka V.",
year = "2013",
abstract = "In this study, removal of arsenic ions using two industrial by-products as adsorbents is represented. Removal of As(III) and As(V) from water was carried out with industrial by-products: residual from the groundwater treatment process, iron-manganese oxide coated sand (IMOCS), and blast furnace slag from steel production (BFS), both inexpensive and locally available. In addition, the BFS was modified in order to minimise its deteriorating impact on the initial water quality. Kinetic and equilibrium studies were carried out using batch and fixed-bed column adsorption techniques under the conditions that are likely to occur in real water treatment systems. To evaluate the application for real groundwater treatment, the capacities of the selected materials were further compared to those exhibited by commercial sorbents, which were examined under the same experimental conditions. IMOCS was found to be a good and inexpensive sorbent for arsenic, while BFS and modified slag showed the highest affinity towards arsenic. All examined waste materials exhibited better sorption performances for As(V). The maximum sorption capacity in the batch reactor was obtained for blast furnace slag, 4040 mu gAs(V)/g.",
publisher = "Hindawi Limited",
journal = "Journal of Chemistry",
title = "Arsenic Removal from Water Using Industrial By-Products",
doi = "10.1155/2013/121024"
}

Lekić, B., Marković, D. D., Rajaković-Ognjanović, V., Đukić, A.,& Rajaković, L. V.. (2013). Arsenic Removal from Water Using Industrial By-Products. in Journal of Chemistry
Hindawi Limited..
https://doi.org/10.1155/2013/121024

Lekić B, Marković DD, Rajaković-Ognjanović V, Đukić A, Rajaković LV. Arsenic Removal from Water Using Industrial By-Products. in Journal of Chemistry. 2013;.
doi:10.1155/2013/121024 .

Lekić, Branislava, Marković, Dana D., Rajaković-Ognjanović, Vladana, Đukić, Aleksandar, Rajaković, Ljubinka V., "Arsenic Removal from Water Using Industrial By-Products" in Journal of Chemistry (2013),
https://doi.org/10.1155/2013/121024 . .

TY  - JOUR
AU  - Rajaković, Ljubinka V.
AU  - Marković, Dana D.
AU  - Rajaković-Ognjanović, Vladana
AU  - Antanasijević, Davor Z.
PY  - 2012
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/466
AB  - The analytical properties of an analytical method must be evaluated through validation protocols. Beside specificity and/or selectivity, linearity of calibration, repeatability and accuracy, the most important parameters are: LOD (limit of detection) and LOQ (limit of quantification). Through these limits, it is possible to define the smallest concentration of analyte that can be reliably detected and quantified. To establish these limits, an analyst should apply several estimation methods and test a large number of sample replicates. It is difficult to make a compromise between complex statistical programs and the simple analytical demand to have reliable analytical parameters. The differences and equivalency of estimation methods and approaches for analytical limits could be overcome by an experimental comparison. In this paper, the focus is the LOD of inductively coupled plasma-mass spectrometry (ICP-MS) measurements employed for the determination of arsenic. The current approaches for the calculation of the LOD are summarized and critically discussed.
PB  - Elsevier B.V.
T2  - Talanta
T1  - Review: The approaches for estimation of limit of detection for ICP-MS trace analysis of arsenic
EP  - 87
SP  - 79
VL  - 102
DO  - 10.1016/j.talanta.2012.08.016
ER  - 

@article{
author = "Rajaković, Ljubinka V. and Marković, Dana D. and Rajaković-Ognjanović, Vladana and Antanasijević, Davor Z.",
year = "2012",
abstract = "The analytical properties of an analytical method must be evaluated through validation protocols. Beside specificity and/or selectivity, linearity of calibration, repeatability and accuracy, the most important parameters are: LOD (limit of detection) and LOQ (limit of quantification). Through these limits, it is possible to define the smallest concentration of analyte that can be reliably detected and quantified. To establish these limits, an analyst should apply several estimation methods and test a large number of sample replicates. It is difficult to make a compromise between complex statistical programs and the simple analytical demand to have reliable analytical parameters. The differences and equivalency of estimation methods and approaches for analytical limits could be overcome by an experimental comparison. In this paper, the focus is the LOD of inductively coupled plasma-mass spectrometry (ICP-MS) measurements employed for the determination of arsenic. The current approaches for the calculation of the LOD are summarized and critically discussed.",
publisher = "Elsevier B.V.",
journal = "Talanta",
title = "Review: The approaches for estimation of limit of detection for ICP-MS trace analysis of arsenic",
pages = "87-79",
volume = "102",
doi = "10.1016/j.talanta.2012.08.016"
}

Rajaković, L. V., Marković, D. D., Rajaković-Ognjanović, V.,& Antanasijević, D. Z.. (2012). Review: The approaches for estimation of limit of detection for ICP-MS trace analysis of arsenic. in Talanta
Elsevier B.V.., 102, 79-87.
https://doi.org/10.1016/j.talanta.2012.08.016

Rajaković LV, Marković DD, Rajaković-Ognjanović V, Antanasijević DZ. Review: The approaches for estimation of limit of detection for ICP-MS trace analysis of arsenic. in Talanta. 2012;102:79-87.
doi:10.1016/j.talanta.2012.08.016 .

Rajaković, Ljubinka V., Marković, Dana D., Rajaković-Ognjanović, Vladana, Antanasijević, Davor Z., "Review: The approaches for estimation of limit of detection for ICP-MS trace analysis of arsenic" in Talanta, 102 (2012):79-87,
https://doi.org/10.1016/j.talanta.2012.08.016 . .