o:1519 Optimizacija postupaka pripreme uzoraka zemljišta za kvantitativnu analizu policikličnih aromatičkih ugljovodonika primenom metode gasna hromatografija-masena spektrometrija Optimization of the soil samples preparations for the determination of polycyclic aromatic hydrocarbons in soil by gas chromatography-mass spectrometry : doctoral dissertation sr Polycyclic aromatic hydrocarbons (PAH) are pollutants of great concern due to their toxicity. European Commission classified 16 compounds as priority pollutants based on their toxicity, carcinogen potential and occurrence. PAH analysis in soil is of great importance, but due to PAHs low concentrations and low selectivity of organic solvents is challenge. The aim of this dissertation was to optimize extraction (ultrasound, Soxhlet extraction and QuEChERS) and clean up techniques for the extraction of 16 priority PAHs from soil, followed by GC - MS analysis. The best results were obtained by QuEChERS technique using acetonitrile/water (1:2, v/v) as extraction solvent and diatomaceous earth as clean up sorbent. Recovery values varied between 81% for benzo[b]fluoranthene to 109% for benzo[a]pyrene. Proposed QuEChERS technique is accurate and precise, but also cheaper and simpler than other methods used for PAH extraction from soil. Optimized QuEChERS technique was applied for real soil samples analysis from urban area of Niš. The content of total PAHs varied from 0,346 48,678 mg kg-1. Multivariate statistical analysis enabled grouping of soil samples based on PAH and heavy metal concentrations and soil properties. Biografija sa bibliografijom: str. 219-226;Bibliografija: str. 195-215. Datum odbrane: 11.09.2018. Analytical chemistry 1025724137 91552101 6356 91552100 1025724137 2018-12-17T16:53:45.053Z 45 no 46 mentor Jelena S. 1988- Nikolić 2018 63 mentor Violeta 1968- Mitić 2018 63 član komisije Vesna 1968- Stankov-Jovanović 2018 63 član komisije Gordana 1960- Stojanović 2018 63 član komisije Goran 1964- Petrović 2018 63 član komisije Slađana Alagić 2018 226 str. 5571533 http://phaidrabg.bg.ac.rs/o:1519 no yes 4 2018-12-17T16:53:45.320Z 70 Polycyclic aromatic hydrocarbons, PAH, optimization, validation,ultrasound extraction, Soxhlet extraction, QuEChERS, gas chromatography, mass spectrometry, heavy metal, PCA, cluster analysis Policiklični aromatični ugljovodonici, PAU, optimizacija, validacija, ultrazvučna ekstrakcija, ekstrakcija po Soksletu, QuEChERS, gasna hromatografija, masena spektrometrija, teški metali, analiza glavnih komponenti, klaster analiza [543.544.3+543.51]:[661.715.7+631.42] Р 003, Р 300 1738 18A07 18A0703 2018