Platinum group element and cerium concentrations in roadside environments in Toronto, Canada.
Platinum group element and cerium concentrations in roadside environments in Toronto, Canada.
复制标题
DOI：
10.1016/j.chemosphere.2015.11.056
复制
发表时间：
2016-02
期刊：
影响因子：
8.8
通讯作者：
C. Wiseman;Zahra Hassan Pour;F. Zereini
中科院分区：
文献类型：
--
作者：
C. Wiseman;Zahra Hassan Pour;F. Zereini
铂（Pt）、钯（Pd）和铑（Rh）由于用作控制汽车尾气排放的催化剂而在全球环境中积累。虽然铂金属浓度在环境中的增加在许多国家都有很好的记录，但迄今为止加拿大的公布数据一直缺失。本研究的目的是研究的Pt，Pd和Rh的浓度，以及Ce，在土壤和灰尘作为交通量的函数在多伦多，安大略。土壤和道路和地下通道的灰尘，收集了两个网站与中等和高流量。在使用ICP-Q-MS进行测量之前，将样品酸消化并与Hg（对于Pd）和Te（对于Pt和Rh）共沉淀。样品中钯的含量最高，其次是Pt和Rh。所有土壤样品的中位浓度分别为63 μg Pd/kg、8.7 μg Pt/kg、1.7 μg Rh/kg和41 mg Ce/kg。结果支持现有的数据，关于铂族元素的积累趋势，在城市和路边的环境中，由于它们的使用作为催化剂在汽车催化转化器。该研究还证实了近年来Pd作为催化剂选择的更大使用的转变，这反映在相对于Pt和Rh测量的该金属的更高浓度。结果强调，需要继续监测的积累PGE，最显着的Pd，在城市环境中。
Platinum (Pt), palladium (Pd) and rhodium (Rh) are accumulating globally in the environment, due to their use as catalysts to control automotive exhaust emissions. While environmental increases in platinum metal concentrations have been well documented for a number of countries, published data for Canada have been missing to date. The aim of this study is to examine the concentrations of Pt, Pd and Rh, as well as Ce, in soils and dust as a function of traffic volume in Toronto, Ontario. Soils and road and underpass dust were collected from two sites with medium and high volumes of traffic. Samples were acid digested and co-precipitated with Hg (for Pd) and Te (for Pt and Rh), prior to measurement using ICP-Q-MS.Palladium occurred at the highest levels in samples, followed by Pt and Rh. Median concentrations for all soil samples were 63 μg Pd/kg, 8.7 μg Pt/kg, 1.7 μg Rh/kg and 41 mg Ce/kg. The results support existing data regarding PGE accumulation trends in urban and roadside environments, due to their use as catalysts in automotive catalytic converters. This study also confirms a shift toward the heavier use of Pd as the catalyst of choice in recent years, as reflected in the higher concentrations measured for this metal relative to Pt and Rh. The results highlight a need to continue monitoring the accumulation of PGE, most notably Pd, in urban environments.