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首页> 外文期刊>Journal of Geochemical Exploration: Journal of the Association of Exploration Geochemists >Spatial distribution and source diagnosis of polycyclic aromatic hydrocarbons in soils from Chengdu Economic Region, Sichuan Province, western China
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Spatial distribution and source diagnosis of polycyclic aromatic hydrocarbons in soils from Chengdu Economic Region, Sichuan Province, western China

机译：中国四川省成都市经济区土壤中多环芳烃的空间分布及来源诊断

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摘要

Surface soils from the Chengdu Economic Region (CER) were analyzed for sixteen United States Environment Protection Agency priority polycyclic aromatic hydrocarbons (PAHs) to study the spatial distribution and to identify the sources of PAHs. Relatively high concentrations (more than 1500 ngg~(-1)) of high molecular weight PAHs were found in Chengdu Plain, in the middle of CER, while high concentrations (more than 500 ng g~(-1)) of low molecular weight PAHs were detected in the surrounding mountains. The concentrations of ∑_(16)-PAHs in topsoil samples from CER (12.52-75,431.47 ngg~(-1) average value was 3233.92 ngg~(-1)) were higher than that from the southern China (21.91-3077 ngg~(-1), average value was less than 500 ngg~(-1)), and they were comparable to concentrations in soils from the northern China (366-254,080 ngg~(-1) mean value was more than 3000 ngg~(-1)). The concentrations from CER were also much higher than the concentrations of some world dean regions such as Antarctic (34.9-171 ngg~(-1)), European high mountains (9-11,000 ngg~(-1) mean value was 158 ngg~(-1)) and some Europe residential (736 ngg~(-1)) and arable soils (60-145 ngg~(-1) mean value was 66 ngg~(-1)). The ratio of tracer compounds (BaA/(BaA + Chr), Flo/ (Flo + Pyr), and IcdP/(IcdP + BghiP)) indicated that the high concentrations of PAHs in soils were mainly derived from fossil fuels combustion in mountain region and from the incomplete combustion of petroleum in developed plain area (such as Chengdu and Deyang). From the above distribution characteristics and ratios of tracer compounds, we inferred the reasons for the distribution pattern of PAHs in CER were the domestic heating, emissions, and the physicochemical properties of PAHs.
机译：分析了成都经济区（CER）的表层土壤中的16种美国环境保护局优先使用的多环芳烃（PAHs），以研究其空间分布并确定PAHs的来源。在CER中部的成都平原发现相对较高浓度的高分子量PAHs（超过1500 ngg〜（-1）），而较低分子量的高浓度PAHs（超过500 ng g〜（-1））。在周围的山脉中发现了多环芳烃。 CER表土样品中∑_（16）-PAHs的浓度（12.52-75,431.47 ngg〜（-1）的平均值为3233.92 ngg〜（-1））高于华南地区的21.91-3077 ngg〜 （-1），平均值小于500 ngg〜（-1）），与中国北方土壤中的浓度相当（366-254,080 ngg〜（-1）平均值大于3000 ngg〜（ -1））。来自CER的浓度也远高于一些世界教务区域的浓度，例如南极（34.9-171 ngg〜（-1）），欧洲高山（9-11,000 ngg〜（-1））的平均值为158 ngg〜 （-1））和一些欧洲住宅（736 ngg〜（-1））和可耕土壤（60-145 ngg〜（-1）的平均值为66 ngg〜（-1））。示踪化合物的比例（BaA /（BaA + Chr），Flo /（Flo + Pyr）和IcdP /（IcdP + BghiP））表明，土壤中PAHs的高浓度主要来自山区的化石燃料燃烧以及发达平原地区（例如成都和德阳）石油的不完全燃烧。从上述示踪化合物的分布特征和比例，我们可以推断出CER中PAHs分布方式的原因是家用供暖，排放以及PAHs的理化特性。

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