福州市道路灰尘中Cu的分布规律及影响因素

Distribution and effect factors of Cu in road dust in Fuzhou

采集福州市26条道路,共102个道路灰尘样品,通过对Cu含量及车流量的综合对比分析,探究道路灰尘中Cu元素的空间分布规律及影响因素。结果表明:(1)福州市各等级道路灰尘中Cu平均质量浓度为主干道(94.13 mg/kg)>次干道(86.76 mg/kg)>支路(69.38 mg/kg),总体与车流量成正比,普遍受到交通活动的影响。(2)相似车流量下,交通不畅及存在重型货车通行的路段,会由于车辆制动系统的额外磨损,在道路灰尘中表现出明显的Cu富集。(3)除交通活动外,道路周围工业活动、城市建设、居民生活等主要潜在污染源的存在和道路清洁程度均是道路灰尘中Cu含量的重要影响因素,其中工业活动污染源的影响最显著。

A total of 102 road dust samples were collected from^26 urban roads in Fuzhou.Then the distribution and effect factors of Cu in road dust were explored by the comprehensive comparative analysis of Cu concentration and road traffic flow.The results showed that:(1)the average concentration of Cu in road dust of different grades in Fuzhou was the main roads(94.13 mg/kg)>the secondary roads(86.76 mg/kg)>the branch roads(69.38 mg/kg),which was proportional to the traffic flow and generally affected by traffic activities.(2)Among roads with similar traffic load,the sections with traffic jam and the passage of heavy vehicles showed significant Cu enrichment in road dust because of the additional wear of vehicle braking system.(3)In addition to traffic activities,the major potential pollution sources around the road(such as industrial products processing,urban construction and residents’life),and road cleanliness were also considered to be important factors of Cu concentration in road dust,among which the industrial pollution source had the most significant impact.