Oen Amy M P, Breedveld Gijs D, Kalaitzidis Stavros, Christanis Kimon, Cornelissen Gerard
Norwegian Geotechnical Institute, P.O. Box 3930 Ullevål Stadion, N-0806, Oslo, Norway.
Environ Toxicol Chem. 2006 May;25(5):1258-67. doi: 10.1897/05-429r.1.
The desorption behavior of phenanthrene, pyrene, and benzo[a]pyrene was investigated for three Norwegian harbor sediments and their respective particle size fractions using the Tenax desorption method. Rate constants for rapidly, slowly, and very slowly desorbing fractions were on the order of 10(-1), 10(-2) to 10(-4), and 10(-4) to 10(-6)/h, respectively. Relatively small amounts were present in the rapidly desorbing fractions (F(rapid): < 6% for phenanthrene, 3-19% for pyrene, and 1-12% for benzo[a]pyrene). With the exception of benzo[a]pyrene, these F(rapid) values were generally lower than median F(rapid) values obtained from more than 100 literature values for native polycyclic aromatic hydrocarbons (PAHs) (22% for phenanthrene, 29% for pyrene, and 8% for benzo[a]pyrene). To understand which parameters influence PAH desorption, relations between desorption behavior and the sediment characteristics were investigated. A significant positive correlation was found between the extent of slow and very slow desorption and the ratios of black carbon to total organic carbon, as well as the temperature at which 50 and 90%, respectively, of the organic matter was oxidized, as obtained from oxidation-only Rock Eval analysis. Thus, black carbon-bound PAHs probably desorb slowly and very slowly. Furthermore, significant positive correlations between desorption behavior and the average particle size were observed, which could be explained by retarded intraparticle diffusion.
采用Tenax解吸法研究了三种挪威港口沉积物及其各自粒径级分中菲、芘和苯并[a]芘的解吸行为。快速、缓慢和非常缓慢解吸组分的速率常数分别约为10^(-1)、10^(-2)至10^(-4)和10^(-4)至10^(-6)/h。快速解吸组分中含量相对较少（菲的F(rapid)：<6%，芘的F(rapid)：3 - 19%，苯并[a]芘的F(rapid)：1 - 12%）。除苯并[a]芘外，这些F(rapid)值通常低于从100多个天然多环芳烃（PAHs）文献值中获得的F(rapid)中值（菲为22%，芘为29%，苯并[a]芘为8%）。为了解哪些参数影响PAH解吸，研究了解吸行为与沉积物特征之间的关系。发现缓慢和非常缓慢解吸的程度与黑碳与总有机碳的比率以及仅通过氧化岩石热解分析获得的分别有50%和90%的有机质被氧化时的温度之间存在显著正相关。因此，与黑碳结合的PAHs可能解吸缓慢和非常缓慢。此外，还观察到解吸行为与平均粒径之间存在显著正相关，这可以用颗粒内扩散受阻来解释。
