TY  - JOUR
AU  - Sredović, I.
AU  - Rajaković, Lj.
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5610
AB  - Corrosion effects in thermal power plants and environmental impact cause an increase in demand for fluorine analysis in coal. Solid sample decomposition, organic and inorganic fluorine compounds, volatility of fluorine species are problems which deserve a special attention. The aim of this work was to optimize the pyrohydrolytic (Phy) determination of fluorine content in the lignite coal. The parameters of pyrohydrolysis were evaluated and optimized by two statistical methods: Plackett-Burman (PB) design and response surface methodology (RSM). The content of fluorine in the absorption solution was measured by fluoride ion-selective electrode. The limit of detection of the proposed method was 20μgg-1, with good recovery (95%) and relative standard deviation less than 5%. With such benefits as simplicity, precision, accuracy and economy, this method is highly suitable for routine analysis of coal.
PB  - Elsevier
T2  - Journal of Hazardous Materials
T1  - Pyrohydrolytic determination of fluorine in coal: A chemometric approach
EP  - 451
IS  - 1-3
SP  - 445
VL  - 177
DO  - 10.1016/j.jhazmat.2009.12.053
ER  - 

@article{
author = "Sredović, I. and Rajaković, Lj.",
year = "2010",
abstract = "Corrosion effects in thermal power plants and environmental impact cause an increase in demand for fluorine analysis in coal. Solid sample decomposition, organic and inorganic fluorine compounds, volatility of fluorine species are problems which deserve a special attention. The aim of this work was to optimize the pyrohydrolytic (Phy) determination of fluorine content in the lignite coal. The parameters of pyrohydrolysis were evaluated and optimized by two statistical methods: Plackett-Burman (PB) design and response surface methodology (RSM). The content of fluorine in the absorption solution was measured by fluoride ion-selective electrode. The limit of detection of the proposed method was 20μgg-1, with good recovery (95%) and relative standard deviation less than 5%. With such benefits as simplicity, precision, accuracy and economy, this method is highly suitable for routine analysis of coal.",
publisher = "Elsevier",
journal = "Journal of Hazardous Materials",
title = "Pyrohydrolytic determination of fluorine in coal: A chemometric approach",
pages = "451-445",
number = "1-3",
volume = "177",
doi = "10.1016/j.jhazmat.2009.12.053"
}

Sredović, I.,& Rajaković, Lj.. (2010). Pyrohydrolytic determination of fluorine in coal: A chemometric approach. in Journal of Hazardous Materials
Elsevier., 177(1-3), 445-451.
https://doi.org/10.1016/j.jhazmat.2009.12.053

Sredović I, Rajaković L. Pyrohydrolytic determination of fluorine in coal: A chemometric approach. in Journal of Hazardous Materials. 2010;177(1-3):445-451.
doi:10.1016/j.jhazmat.2009.12.053 .

Sredović, I., Rajaković, Lj., "Pyrohydrolytic determination of fluorine in coal: A chemometric approach" in Journal of Hazardous Materials, 177, no. 1-3 (2010):445-451,
https://doi.org/10.1016/j.jhazmat.2009.12.053 . .

TY  - JOUR
AU  - Rajaković-Ognjanović, V.
AU  - Aleksić, G.
AU  - Rajaković, Lj.
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5548
AB  - This paper has been focused on the sorbent efficiency for motor oil removal from water. Two types of sorbents were investigated: organic and inorganic. Natural wool fibers (NWFs) and recycled-wool-based nonwoven material (RWNM)) were tested as organic type of sorbents. Sepiolite, bentonite and zeolite have been chosen as representative inorganic sorbents. Sorption was carried out in batch sorption system. Efficiency of oil removal was determined by measuring the oil concentration before and after the sorption process. Extractive-gravimetric method and refractive index determination have been applied as analytical methods for determination of oil concentration in water. Governing factors for sorbent efficiency were proposed, analysed and compared. It was concluded that sorption process is mostly affected by mass of sorbent, sorption time, temperature and pH value of water. NWFs, which were the most efficient sorbent showed maximal efficiency and maximal sorption capacity: 0.1 g of NWFs after 10 min at 20 °C and pH 8.00 sorbed 3.3 g of motor oil from 300 mL of water polluted with 4.5 g of motor oil. Maximal efficiency for all sorbents investigated was reached after 30 min of sorption processes, it was 95.0% for NWF, 43.0% for NRWM, 20.7% for sepiolite, 19.6% for bentonite and 21.2% for zeolite. Physical adsorption onto all sorbents is a favorable process (sorption efficiency decrease with increasing temperature) while sorption onto bentonite and zeolite is a result of both physical adsorption and chemisorption (sorption efficiency increase with increasing temperature, up to 80 °C).
PB  - Elsevier B.V.
T2  - Journal of Hazardous Materials
T1  - Governing factors for motor oil removal from water with different sorption materials
EP  - 563
IS  - 1-3
SP  - 558
VL  - 154
DO  - 10.1016/j.jhazmat.2007.10.066
ER  - 

@article{
author = "Rajaković-Ognjanović, V. and Aleksić, G. and Rajaković, Lj.",
year = "2008",
abstract = "This paper has been focused on the sorbent efficiency for motor oil removal from water. Two types of sorbents were investigated: organic and inorganic. Natural wool fibers (NWFs) and recycled-wool-based nonwoven material (RWNM)) were tested as organic type of sorbents. Sepiolite, bentonite and zeolite have been chosen as representative inorganic sorbents. Sorption was carried out in batch sorption system. Efficiency of oil removal was determined by measuring the oil concentration before and after the sorption process. Extractive-gravimetric method and refractive index determination have been applied as analytical methods for determination of oil concentration in water. Governing factors for sorbent efficiency were proposed, analysed and compared. It was concluded that sorption process is mostly affected by mass of sorbent, sorption time, temperature and pH value of water. NWFs, which were the most efficient sorbent showed maximal efficiency and maximal sorption capacity: 0.1 g of NWFs after 10 min at 20 °C and pH 8.00 sorbed 3.3 g of motor oil from 300 mL of water polluted with 4.5 g of motor oil. Maximal efficiency for all sorbents investigated was reached after 30 min of sorption processes, it was 95.0% for NWF, 43.0% for NRWM, 20.7% for sepiolite, 19.6% for bentonite and 21.2% for zeolite. Physical adsorption onto all sorbents is a favorable process (sorption efficiency decrease with increasing temperature) while sorption onto bentonite and zeolite is a result of both physical adsorption and chemisorption (sorption efficiency increase with increasing temperature, up to 80 °C).",
publisher = "Elsevier B.V.",
journal = "Journal of Hazardous Materials",
title = "Governing factors for motor oil removal from water with different sorption materials",
pages = "563-558",
number = "1-3",
volume = "154",
doi = "10.1016/j.jhazmat.2007.10.066"
}

Rajaković-Ognjanović, V., Aleksić, G.,& Rajaković, Lj.. (2008). Governing factors for motor oil removal from water with different sorption materials. in Journal of Hazardous Materials
Elsevier B.V.., 154(1-3), 558-563.
https://doi.org/10.1016/j.jhazmat.2007.10.066

Rajaković-Ognjanović V, Aleksić G, Rajaković L. Governing factors for motor oil removal from water with different sorption materials. in Journal of Hazardous Materials. 2008;154(1-3):558-563.
doi:10.1016/j.jhazmat.2007.10.066 .

Rajaković-Ognjanović, V., Aleksić, G., Rajaković, Lj., "Governing factors for motor oil removal from water with different sorption materials" in Journal of Hazardous Materials, 154, no. 1-3 (2008):558-563,
https://doi.org/10.1016/j.jhazmat.2007.10.066 . .