Based on a monthly field survey in 2011 of the Pearl River Estuary, the dynamics of polycyclic aromatic hydrocarbons (PAHs) in surface sediments (depth < 5 cm) were explored. The seasonal variations in PAH level and composition were investigated in this study, as well as their environmental behaviors, the role of particles, and source apportionment. The concentration of the sum of 16 priority PAHs (defined as ∑16PAHs) ranged from 0.32 to 1.10 μg/g, while that of the sum of 62 PAHs (defined as ∑tPAHs) varied from 0.83 to 2.75 μg/g. The levels of both the ∑16PAHs and ∑tPAHs peaked in February, although the minimum levels appeared in different months-December and August, respectively. The seasonal difference in the ∑tPAHs was significant (flood season, 7.69 μg/g; dry season, 10.51 μg/g). The 5-ring PAH compound (e.g., perylene) was the most abundant and was responsible for 35% of the total, which implied a terrestrial input source via the Pearl River. Sediment particles were predominantly composed of clayed sand, and sediment PAHs showed a greater tendency to be adsorbed onto the large-sized particles rather than the fine fractions. Total organic carbon (TOC) could considerably facilitate the sediment PAHs. Principal component analysis revealed that vehicle emission sources, petroleum sources, and combustion sources were the major anthropogenic contamination sources. The diagnostic ratios of various individual PAHs were also explored. These findings are particularly useful for understanding the geochemistry of organic pollutants in the complex estuarine environment.

中文翻译：

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珠江口表层沉积物中多环芳烃的田间分析及其环境影响。

根据2011年珠江口的月度野外调查，研究了地表沉积物（深度<5 cm）中多环芳烃（PAHs）的动力学。在这项研究中调查了PAH水平和组成的季节性变化，以及它们的环境行为，颗粒的作用和源分配。16种优先PAH的总和（定义为∑16PAHs）的浓度范围为0.32至1.10μg/ g，而62种PAH的总和（定义为∑tPAHs）的浓度范围为0.83至2.75μg/ g。∑16PAHs和∑tPAHs的水平都在2月达到峰值，尽管最低水平分别出现在12月和8月。∑tPAHs的季节差异显着（汛期为7.69μg/ g；旱季为10.51μg/ g）。5环PAH化合物（例如，ylene）是最丰富的，占总数的35％，这意味着通过珠江的地面输入源。沉积物颗粒主要由黏土组成，沉积物PAHs表现出更大的吸附在大颗粒上的趋势，而不是细颗粒。总有机碳（TOC）可以极大地促进沉积物多环芳烃的产生。主成分分析表明，车辆排放源，石油源和燃烧源是主要的人为污染源。还探讨了各种单独的PAH的诊断率。这些发现对于了解复杂河口环境中有机污染物的地球化学特别有用。这意味着通过珠江的地面输入源。沉积物颗粒主要由黏土组成，沉积物PAHs表现出更大的吸附在大颗粒上的趋势，而不是细颗粒。总有机碳（TOC）可以极大地促进沉积物多环芳烃的产生。主成分分析表明，车辆排放源，石油源和燃烧源是主要的人为污染源。还探讨了各种单独的PAH的诊断率。这些发现对于了解复杂河口环境中有机污染物的地球化学特别有用。这意味着通过珠江的地面输入源。沉积物颗粒主要由黏土组成，沉积物PAHs表现出更大的吸附在大颗粒上的趋势，而不是细颗粒。总有机碳（TOC）可以极大地促进沉积物的PAHs。主成分分析表明，车辆排放源，石油源和燃烧源是主要的人为污染源。还探讨了各种单独的PAH的诊断率。这些发现对于了解复杂河口环境中有机污染物的地球化学特别有用。沉积物PAHs表现出更大的吸附在大颗粒上的趋势，而不是细小部分。总有机碳（TOC）可以极大地促进沉积物多环芳烃的产生。主成分分析表明，车辆排放源，石油源和燃烧源是主要的人为污染源。还探讨了各种单独的PAH的诊断率。这些发现对于了解复杂河口环境中有机污染物的地球化学特别有用。沉积物PAHs表现出更大的吸附在大颗粒上的趋势，而不是细小部分。总有机碳（TOC）可以极大地促进沉积物的PAHs。主成分分析表明，车辆排放源，石油源和燃烧源是主要的人为污染源。还探讨了各种单独的PAH的诊断率。这些发现对于了解复杂河口环境中有机污染物的地球化学特别有用。还探讨了各种单独的PAH的诊断率。这些发现对于了解复杂河口环境中有机污染物的地球化学特别有用。还探讨了各种单独的PAH的诊断率。这些发现对于了解复杂河口环境中有机污染物的地球化学特别有用。