Profiles, sources, and transport of polycyclic aromatic hydrocarbons in soils affected by electronic waste recycling in Longtang, south China
Profiles, sources, and transport of polycyclic aromatic hydrocarbons in soils affected by electronic waste recycling in Longtang, south China
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DOI：
10.1007/s10661-014-3622-z
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发表时间：
2014-01
影响因子：
3
通讯作者：
De-yin Huang;Chuan-ping Liu;Fangbai Li;Tong-xu Liu;Cheng-shuai Liu;Liang Tao;Yan Wang
中科院分区：
文献类型：
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作者：
De-yin Huang;Chuan-ping Liu;Fangbai Li;Tong-xu Liu;Cheng-shuai Liu;Liang Tao;Yan Wang
以我国南方电子废弃物回收中心龙塘地区为研究对象，研究了土壤中多环芳烃（PAHs）的分布特征、来源及迁移规律。16种多环芳烃浓度之和从25至4，300纳克/克（干重）不等，按以下顺序排列：池塘沉积物地点（77纳克/克）、菜地（129纳克/克）、稻田（180纳克/克）、荒地（258纳克/克）、拆解地点（678纳克/克）和以前的露天焚烧地点（2，340纳克/克）。萘、菲、荧蒽、芘、芘和苯并[B]荧蒽是主要的多环芳烃，约占总多环芳烃的75%.结果表明，6个样地类型的PAHs组成特征相似，且PAHs的个体、低分子量、高分子量和总量之间存在显著的相关性，说明PAHs的来源相似。同分异构体比值和主成分分析结果均证实了电子垃圾的不完全燃烧是多环芳烃的主要来源。原露天焚烧场和拆解场是多环芳烃的主要来源。土壤样品采取更接近点源有高的PAH浓度。多环芳烃通过不同的土壤剖面迁移，包括农田中的土壤剖面，不仅在0至40厘米深的土壤中检测到，而且在40厘米至80厘米深的土壤中也检测到。龙塘土壤中的多环芳烃浓度受到原始电子废物回收的强烈影响，特别是以前的露天焚烧活动。
We studied the profiles, possible sources, and transport of polycyclic aromatic hydrocarbons (PAHs) in soils from the Longtang area, which is an electronic waste (e-waste) recycling center in south China. The sum of 16 PAH concentrations ranged from 25 to 4,300 ng/g (dry weight basis) in the following order: pond sediment sites (77 ng/g), vegetable fields (129 ng/g), paddy fields (180 ng/g), wastelands (258 ng/g), dismantling sites (678 ng/g), and former open burning sites (2,340 ng/g). Naphthalene, phenanthrene, fluoranthene, pyrene, chrysene, and benzo[b]fluoranthene were the dominant PAHs and accounted for approximately 75 % of the total PAHs. The similar composition characteristics of PAHs and the significant correlations among individual, low molecular weight, high molecular weight, and total PAHs were found in all six sampling site types, thus indicating that PAHs originated from similar sources. The results of both isomeric ratios and principal component analyses confirmed that PAHs were mainly derived from the incomplete combustion of e-waste. The former open burning sites and dismantling sites were the main sources of PAHs. Soil samples that were taken closer to the point sources had high PAH concentrations. PAHs are transported via different soil profiles, including those in agricultural fields, and have been detected not only in 0- to 40-cm-deep soil but also in 40 cm to 80 cm-deep soil. PAH concentrations in soils in Longtang have been strongly affected by primitive e-waste recycling, particularly by former open burning activities.