We applied the traditional risk assessment methods originally designed for soils and river sediments to evaluation of risk associated with metals in road-deposited sediment (RDS) along an urban-rural gradient that included central urban (UCA), urban village (UVA), central suburban county (CSA), rural town (RTA), and rural village (RVA) areas in the Beijing metropolitan region. A new indicator RI(RDS) was developed which integrated the RDS characteristics of mobility, grain size and amount with the potential ecological risk index. The risk associated with metals in RDS in urban areas was generally higher than that in rural areas based on the assessment using traditional methods, but the risk was higher in urban and rural village areas than the areas with higher administration units based on the indicator RI(RDS). These findings implied that RDS characteristics variation with the urban-rural gradient must be considered in metal risk assessment and RDS washoff pollution control.

译文

:我们将最初为土壤和河流沉积物设计的传统风险评估方法应用于沿城乡梯度(包括中心城市(UCA),城市村庄(UVA),北京都会区的中央郊区县(CSA),乡镇(RTA)和乡村(RVA)地区。开发了新的指标RI(RDS),该指标将RDS的迁移率,粒度和数量与潜在的生态风险指数相结合。根据传统方法的评估,城市地区RDS中与金属有关的风险通常高于农村地区,但根据指标RI,城市和乡村地区的风险高于具有较高管理单位的地区( RDS)。这些发现表明,在金属风险评估和RDS冲刷污染控制中必须考虑RDS特征随城乡梯度的变化。

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