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Influence of sample pretreatment on the extractability of polycyclic aromatic hydrocarbons (PAH) from forest floor horizons
Author(s) -
Guggenberger Georg,
Pichler Martin,
Zech Wolfgang
Publication year - 1996
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.1996.3581590415
Subject(s) - extraction (chemistry) , dispersion (optics) , chemistry , environmental chemistry , yield (engineering) , organic matter , aggregate (composite) , environmental science , chromatography , materials science , organic chemistry , nanotechnology , metallurgy , physics , optics
Extraction of PAH from Oh‐horizon material after dispersion of air‐dried samples in water resulted in a 80% higher yield of 20 PAH species compared to extraction of air‐dried, freeze‐dried or ground samples. Concurrently, the free surface area (BET method) of the organic matter increased. It was assumed that dispersion resulted in a disaggregation and/or stretching of organic aggregates, which makes interior aggregate regions available to the extractant that were pre‐viously not accessible for the extractant due to diffusion barriers.