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首页> 外文期刊>Environmental Monitoring and Assessment >Concentrations and inventories of polycyclic aromatic hydrocarbons and organochlorine pesticides in watershed soils in the Pearl River Delta, China
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Concentrations and inventories of polycyclic aromatic hydrocarbons and organochlorine pesticides in watershed soils in the Pearl River Delta, China

机译：珠江三角洲流域土壤中多环芳烃和有机氯农药的浓度和清单

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摘要

The concentration levels, source, and inventories of polycyclic aromatic hydrocarbons (PAHs) and organochlorine pesticides (OCPs) in 55 surface vegetable soils in the watershed of the Pearl River Delta (PRD) were analyzed and compared with those of the surface sediments in the Pearl River Estuary (PRE) and northern South China Sea (SCS). The 16 priority PAHs on US EPA list range from 58 to 3,077 μg/kg (average: 315 μg/kg). The concentrations of DDTs and HCHs range from 3.58 to 831 μg/kg (average: 82.1 μg/kg) and from 0.19 to 42.3 μg/kg (average: 4.42 μg/kg). The ratios of DDT/ (DDD+DDE) are higher than 2 in majority of the soil samples, suggesting that DDT contamination still exists. The PAH ratios suggest that the source of PAHs is petroleum, and combustion of fossil fuel, biomass, and coal. The average concentrations of PAHs and the linear regression slope between PAHs and TOC for the soils and the sediments are quite similar. It was estimated that the soil mass inventories at 0-20 cm depth are 1,292 metric tons for PAHs and 356 metric tons for OCPs in the studied region. The average PAHs inventory per unit area for the soil samples investigated in PRD is about 0.86 time that of surface sediments in the Pearl River Estuary, and about 2.43 times that of surface sediments in the northern South China Sea. PAHs in the soils in PRD have similar source to those of the surface sediments in PRE. All of those may suggest that PAHs in PRE and SCS are probably mainly inputted from the soils in PRD via soil erosion and river transport.
机译：分析了珠江三角洲（PRD）流域55个表层蔬菜土壤中多环芳烃（PAHs）和有机氯农药（OCPs）的浓度水平，来源和清单，并将其与珠江中的表层沉积物进行了比较。河口（PRE）和南海北部（SCS）。美国EPA清单上的16种优先多环芳烃的含量范围为58至3,077μg/ kg（平均：315μg/ kg）。滴滴涕和六氯环己烷的浓度范围为3.58至831μg/ kg（平均：82.1μg/ kg）和0.19至42.3μg/ kg（平均：4.42μg/ kg）。在大多数土壤样品中，DDT /（DDD + DDE）的比率都高于2，这表明DDT污染仍然存在。 PAH比率表明，PAHs的来源是石油，以及化石燃料，生物质和煤炭的燃烧。土壤和沉积物中PAHs的平均浓度以及PAHs和TOC之间的线性回归斜率非常相似。据估计，在研究区域中，0-20厘米深度的土壤质量清单中，多环芳烃为1,292公吨，而OCP为356公吨。珠三角调查的土壤样品的平均每单位面积PAHs约为珠江口表层沉积物的0.86倍，约为南海北部表层沉积物的2.43倍。珠三角土壤中的PAHs与PRE中表面沉积物的来源相似。所有这些可能表明，PRE和SCS中的PAHs可能主要是通过水土流失和河流运输从珠三角的土壤中输入的。

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