Geographic Institute, University of Berne, Hallerstrasse 12, 3012 Berne, Switzerland.
Geographic Institute, University of Berne, Hallerstrasse 12, 3012 Berne, Switzerland.
Sci Total Environ. 2014 Mar 1;473-474:317-25. doi: 10.1016/j.scitotenv.2013.12.037. Epub 2013 Dec 27.
We evaluated the effects of soil properties and climate on concentrations of parent and oxygenated polycyclic aromatic compounds (PAHs and OPAHs) and azaarenes (AZAs) in topsoil and subsoil at 20 sites along a 2100-km north (N)-south (S) transect in Argentina. The concentrations of Σ29PAHs, Σ15OPAHs and Σ4AZAs ranged 2.4-38 ng g(-1), 0.05-124 ng g(-1) and not detected to 0.97 ng g(-1), respectively. With decreasing anthropogenic influence from N to S, low molecular weight PAHs increasingly dominated. The octanol-water partitioning coefficients correlated significantly with the subsoil to topsoil concentration ratios of most compounds suggesting leaching as the main transport process. Organic C concentrations correlated significantly with those of many compounds typical for atmosphere-soil partitioning. Lighter OPAHs were mainly detected in the S suggesting biological sources and heavier OPAHs in the N suggesting a closer association with parent-PAHs. Decreasing alkyl-naphthalene/naphthalene and 9,10-anthraquinone (9,10-ANQ)/anthracene ratios from N to S indicated that 9,10-ANQ might have originated from low-temperature combustion.
我们评估了土壤性质和气候对 29 种多环芳烃（PAHs）、15 种含氧多环芳烃（OPAHs）和 4 种氮杂多环芳烃（AZAs）在阿根廷 2100 公里长的南北向（N-S）样带 20 个地点表土和底土中浓度的影响。Σ29PAHs、Σ15OPAHs 和 Σ4AZAs 的浓度范围分别为 2.4-38ng/g、0.05-124ng/g 和未检出至 0.97ng/g。随着从 N 到 S 的人为影响降低，低分子量 PAHs 逐渐占主导地位。辛醇-水分配系数与大多数化合物的底土与表土浓度比显著相关，表明淋溶是主要的迁移过程。有机碳浓度与许多典型的大气-土壤分配化合物显著相关。较轻的 OPAHs 主要在 S 中检测到，表明其来源为生物源，而较重的 OPAHs 在 N 中检测到，表明其与母体-PAHs 密切相关。从 N 到 S，烷基萘/萘和 9,10-蒽醌（9,10-ANQ）/蒽的比值降低，表明 9,10-ANQ 可能来自低温燃烧。
