Polycyclic aromatic hydrocarbons in soil of the backfilled region in the Wuda coal fire area, Inner Mongolia, China
Polycyclic aromatic hydrocarbons in soil of the backfilled region in the Wuda coal fire area, Inner Mongolia, China
复制标题
内蒙古乌达煤火区回填区土壤中多环芳烃
DOI：
10.1016/j.ecoenv.2018.08.065
复制
发表时间：
2018
影响因子：
6.8
通讯作者：
Cheng Hongfei
中科院分区：
文献类型：
--
作者：
Liang Ming;Liang Yanci;Liang H;ong;Rao Zhu;Cheng Hongfei
中国内蒙古乌达煤火区已存在50年，多年来一直采用挖土回填法进行控制。然而，很少有研究关注回填区有机污染物的排放对当地环境和生态系统的影响。在研究中，选取了存在5年的乌达煤火区回填区0 ~ 5 cm深度的表土样品。采用标准操作程序和高效液相色谱（HPLC）对样品中16种重点控制污染物多环芳烃（PAHs）进行分析。结果表明：16种多环芳烃的总质量浓度（∑16PAHs）在279 ~ 8258 μg kg-1之间，平均值为2853 ± 2948 µg kg-1，超过了重污染土壤的规定限值（1000 μg kg-1）。在16个PAHs中，2环和3环化合物占∑16PAHs的一半以上。结果表明，该区主要污染物为萘（Nap）、菲（Phe）、芘（Pyr）、芘（Chr）和苯并[b]荧光蒽（BbF），分别占∑16PAHs总量的24.8%、51.1%、3.9%、4.5%和5.7%。FLA/(FLA + PYR)诊断率大于0.4,IcdP/(IcdP + BghiP)诊断率小于0.5，提示煤火为轻度阴燃或自燃，与传统燃煤不同。利用回填区表层土壤计算的环境健康风险，即癌症风险（CR），成人为2.84 × 10-6，儿童为1.01 × 10-6，具有潜在的癌症风险。因此，研究区回填区表层土壤中的多环芳烃污染是一个亟待关注的问题。
The Wuda coal fire area in Inner Mongolia, China, has existed for 50 years and been controlled by digging and backfilling for many years. However, few studies have focused on its impact on the local environmental and ecological systems due to emission of organic contaminants from the backfilled region. In the study, topsoil samples were collected at a 0–5 cm depth from the backfilled region of the Wuda coal fire area, which has existed for five years. The samples were analyzed for 16 priority control contaminants, namely polycyclic aromatic hydrocarbons (PAHs), with a standard operation procedure and high-performance liquid chromatograph (HPLC). The results showed that the total mass contentration of 16 PAHs (∑16PAHs) ranged from 279 to 8258 μg kg-1, with an average value of 2853 ± 2948 µg kg-1, which exceeded the stipulated limit for heavily contaminated soil (1000 μg kg-1). Among the 16 PAHs, 2- and 3-ring compounds accounted for more than half of ∑16PAHs. Furthermore, the results show that the main contaminants were the naphthalene (Nap), phenanthrene (Phe), pyrene (Pyr), chrysene (Chr), and benzo[b]fluoranthene (BbF) in this area (24.8%, 51.1%, 3.9%, 4.5%, and 5.7% of ∑16PAHs, respectively). The diagnostic ratio of FLA/(FLA + PYR) exceeded 0.4 and IcdP/(IcdP + BghiP) was less than 0.5, indicating gentle smoldering or spontaneous combustion of coal fire, which differs from traditional coal burning. The environmental health risk or specifically the cancer risk (CR), calculated using the surface soil of the backfilled region, was 2.84 × 10-6for adults and 1.01 × 10-6for children, thus indicating potential cancer risks. Therefore, PAHs pollution in the surface soil of the backfilled region in the studied coal fire area is an issue that deserves urgent attention.