First study on anthropogenic Pt, Pd, and Rh levels in soils from major avenues of São Paulo City, Brazil
First study on anthropogenic Pt, Pd, and Rh levels in soils from major avenues of São Paulo City, Brazil
复制标题
首次对巴西圣保罗市主要街道土壤中人为铂、钯和铑含量进行研究
DOI：
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发表时间：
2012
影响因子：
3
通讯作者：
Bernd Markert
中科院分区：
文献类型：
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作者：
Andreza Portella Ribeiro;Ana Maria Graciano Figueiredo;J. Sarkis;M. Hortellani;Bernd Markert
在过去的几年里，关于世界各地大城市环境中铂(铂)、钯(Pd)和铑(Rh)水平增加的研究取得了很大进展，特别是对催化转化器排放的影响。S圣保罗市是世界第六大特大城市，约有2000万居民，机动车数量不断增加。尽管如此，关于该市铂、钯和Rh水平的调查从未进行过。本研究测定了圣保罗S市区七条主要高密度交通干道附近土壤中铂、钯和Rh的浓度。采用超声辅助王水浸出后的电感耦合等离子体质谱作为分析技术。结果显示，Pd的浓度水平高达378g−1，铂的浓度水平高达208g−1，Rh的浓度水平高达0.2g−1至45g−1。这些水平远高于土壤的地球化学背景，表明有催化转化源。由于巴西汽车催化转化器中的铂/钯/Rh的比例不同，与其他类似的研究相比，铂/钯的比例较低。这些结果是首次监测S保罗市土壤中铂、钯和Rh污染的数据。
Over the last years, investigations on the increase of platinum (Pt), palladium (Pd), and rhodium (Rh) levels in urban environments of big cities all over the world - especially to catalytic converters emissions - have been grown up enormously. São Paulo City is the 6th largest megacity in the world having about 20 million inhabitants and an ever increasing seven million motor vehicle fleet. In spite of this, there has never been an investigation regarding Pt, Pd, and Rh levels in the city. In the present study, Pt, Pd, and Rh concentrations were determined in soils adjacent to seven main high-density traffic avenues in the metropolitan region of São Paulo City. Inductively coupled plasma mass spectrometry was employed - after ultrasound-assisted aqua regia leaching - as analytical technigue. The results showed concentration levels up to 378 ng g−1 for Pd, 208 ng g−1 for Pt, and 0.2 to 45 ng g−1 for Rh. These levels are much higher than those considered for the geochemical background of soils, indicating a catalytic converter source. Due to the different Pt/Pd/Rh ratio in Brazilian automobile catalytic converters, lower levels of Pt/Pd ratios compared with other similar studies were observed. The obtained results are the first data for monitoring Pt, Pd, and Rh pollution in São Paulo City soils.