Sources and characteristics of lead pollution in the urban environment of Guangzhou
Sources and characteristics of lead pollution in the urban environment of Guangzhou
复制标题
DOI：
10.1016/j.scitotenv.2007.06.047
复制
发表时间：
2007-10-15
影响因子：
9.8
通讯作者：
Duzgoren-Aydin, Nurdan S.
中科院分区：
文献类型：
--
作者：
Duzgoren-Aydin, Nurdan S.
广州是东南部广东省的省会，是中国最大、发展最快的工业城市之一。近年来，经济的快速发展为珠江三角洲地区带来了巨大的繁荣，但也带来了各种各样的环境问题。尽管广州在1997年禁止使用含铅汽油，但目前地表环境中的铅（Ph）污染水平（75-926毫克/公斤）仍然是一个主要问题。广州市非密闭环境（道路粉尘和沟渠沉积物）和相对密闭环境（车辆隧道）的城市粉尘Ph同位素比值(Pb-206/(207) Pbmin-max: 1.1612 ~ 1.1961, Pb-208/Pb-207(min-max): 2.4495 ~ 2.4838)保持在较窄的范围内，与区域自然和人为来源的Ph同位素比值相当。由于靶介质（城市粉尘）和潜在源具有相似的高放射性Ph同位素值，因此该研究突出了Pb同位素指纹技术用于Pb源溯源的固有缺陷。这不仅可能导致高估逐步淘汰含铅汽油的有效性，而且还可能导致低估其他潜在污染源不断增加的相对贡献，包括煤炭燃烧、当地铅矿的工业排放和原油的非添加剂Ph含量。早期机动车排放的含铅汽油所沉积的再悬浮的铅化颗粒，其Ph同位素组成明显较低，仍然是该地区Ph污染的重要来源。(C) 2007 Elsevier B.V.版权所有
Guangzhou, the capital of the southeastern province of Guangdong, is one of the largest and most rapidly developing industrial cities in China. In recent years its rapid economic development has brought great prosperity to the Pearl River Delta (PRD) region, but has also given rise to a wide variety of environmental problems. The current level of lead (Ph) contamination (75-926 mg/kg) in the surface environment of Guangzhou remains a major concern, even though the use of leaded petrol in the city was banned in 1997. The Ph isotope ratios (Pb-206/(207) Pbmin-max : 1.1612-1.1961 and Pb-208/Pb-207(min-max) : 2.4495-2.4838) of the urban dusts from unconfined (road dusts and gully sediments) and relatively confined (vehicular tunnel) settings in Guangzhou remains in a relatively narrow range, comparable with those of the regional natural and anthropogenic sources. This study highlights the inherent shortcomings of the Pb isotope fingerprinting technique for provenancing Pb sources, as both the target media (urban dusts) and potential sources have similar and highly radiogenic Ph isotope values. This could not only lead to an overestimation of the effectiveness of phasing-out of leaded petrol, but also an underestimation of the ever-increasing relative contributions from other potential sources of pollution, including coal combustion, industrial emissions of local Pb-ores and non-additive Ph contents of crude oils. Re-suspended Pb-beating particulates deposited from early vehicular exhaust emission of leaded petrol with distinctly low Ph isotope compositions are still an important source of Ph pollution in the region. (C) 2007 Elsevier B.V. All rights reserved.