【摘要】 通过对珠江广州河段沉积物进行粒度分级:>500μm,500μm>>220μm,220μm>>63μm,,63μm>>22μm,<22μm.对各个粒级的样品重液分离,收集轻组分(有机质)和重组分(主要为无机矿物及无定型有机质).参照美国EPA8000系列方法分析样品中多环芳烃(PAHs),利用显微镜对沉积物中不同组分进行鉴定,讨论了PAHs在沉积物不同组分中的分布规律.更多还原

【Abstract】 Wet sieving was performed to separate the sediment into five size fractions （>500 μm, 500 μm >>220 μm, 220 μm >>63 μm, 63 μm >>22 μm,<22 μm ） and further separated into low (<1.8 g·cm^-3) and high (>8 g·cm^-3) density fractions using a cesium chloride solution having a specific gravity of 1.8±0.05 (g·cm^-3). These sorbents were characterized under microscope. Each size and density fractions were then analyzed for PAHs.更多还原