Trace analysis of persistent organochlorine compounds in soil and atmospheric particles

Dvoršćak, Marija (2015) Trace analysis of persistent organochlorine compounds in soil and atmospheric particles. Doctoral thesis, Faculty of Science > Department of Chemistry.

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Abstract

Microwave-assisted or ultrasound-assisted extraction procedures were developed for multiresidue trace analysis of organochlorine (OC) pesticides and specific polychlorinated biphenyl congeners in soil (35 compounds) and atmospheric particles PM2.5 (27 compounds). The extraction solvent was the mixture ψ(n-hexane, acetone)=1:1. Purified extracts were analysed using gas chromatography with electron capture and mass spectrometric detection. The influence of soil matrix components on the efficiency of two different extraction procedures and on the selectivity and sensitivity of detector response was investigated. The microwave-assisted extraction was applied for the analysis of OC compounds in soils and lake sediments collected in the area of Plitvice Lakes National Park and in soils collected in the city of Varaždin, while the ultrasonic extraction was used for analyses of these pollutants in PM2.5 atmospheric particles collected in Zagreb. Mass fractions of OC pollutants in soils and sediments (ng kg-1 to μg kg-1) as well as their mass concentrations in particles in air (pg m−3) were at levels of global environmental pollution. The most frequently detected OC pollutant in soils and sediments was p,p'-DDE, and in PM2,5 particles in air γ-hexachlorocyclohexane. The p,p’-DDE/p,p’-DDT in Varaždin soils and in atmospheric particles indicated a constant input of p,p’-DDT traces in the environment. Mass concentrations of OC pollutants in PM2.5 particles in air were considerably lower in 2010 than those measured at the same location in the 2000 to 2003 period.

Item Type: Thesis (Doctoral thesis)
Keywords: atmospheric particles PM2.5, microwave-assisted extraction, organochlorine pesticides, polychlorinated biphenyls, sediment, soil, ultrasound-assisted extraction
Supervisor: Drevenkar, Vlasta
Date: 2015
Number of Pages: 177
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Faculty of Science > Department of Chemistry
Depositing User: Branka Maravic
Date Deposited: 01 Jul 2015 09:18
Last Modified: 01 Jul 2015 09:18
URI: http://digre.pmf.unizg.hr/id/eprint/4073

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