engleski

Trace enrichment of polychlorinated biphenyls in soil : efficiency of sonicated liquid-solid extraction with acetone/n-hexane mixture from different soil types

The efficiency and repeatability of an analytical procedure for trace determination of polychlorinated biphenyls (PCBs) in soil/sediment samples were evaluated by analysis of soils differing in their sorption-controlling properties. PCBs were accumulated from soil by sonicated multiple extraction with 1:1 acetone/n-hexane mixture. The extracts, purified by treatment with copper powder, mercury and sulphuric acid were analysed by gas chromatography. The extraction efficiency from a soil spiked with 4 - 430 ľg/kg of Aroclor 1242/Aroclor 1260 mixture was dependent on initial PCBs mass fraction. The matrix effect was evaluated by analysis of PCBs added to five European reference soils differing in organic matter content, grain size distribution, mineral composition, pH values and iron and aluminium oxides content. In four of those soils a linear correlation was found between the slopes of calibration lines for the determination of PCBs and soil organic matter content. The exception was the most acidic soil with the highest but poorly humified organic matter. The linear regression of calibration line slopes and the content of soil fine silt particles indicated a positive but not statistically significant correlation.

Aroclor 1242; Aroclor 1260; soil/sediment analysis; soil sorption controlling properties; Euro-Soils; extraction efficiency; gas chromatographic analysis

nije evidentirano