内蒙古工农牧区土壤中NBFRs和DPs的水平、分布特征及来源
NBFRs and DPs in the soil of industrial, agricultural and pastoral areas in Inner Mongolia:Level, distribution and source
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摘要: 本文检测了我国内蒙古地区工业区、农业区、牧区的33个土壤样品中6种新型溴代阻燃剂（NBFRs）和2种德克隆（DPs）浓度水平，探讨它们在不同功能区的分布特征和主要来源.结果显示，∑6NBFRs和∑2DPs浓度范围分别是1.06—981.51 pg·g-1 dw（干重）、ND—352.53 pg·g-1 dw，与国内外相比均处于较低的污染水平.NBFRs平均浓度表现出工业区 > 农业区 > 牧区的趋势，而不同类型表现出TBPH > PBBA > HBB > PBT > PBBz > PBEB的趋势.DPs平均浓度在工业区最高.研究发现，HBB在迁移过程容易发生降解，PBBA、TBPH、DPs迁移能力偏弱，主要影响污染源的周边环境，PBBz和PBT迁移能力较强，主要来自于低海拔地区的远距离输送，并已成为内蒙古地区的普遍污染物质.Abstract: The distribution and source of novel brominated flame retardants (NBFRs) and dechlorane plus (DPs) in soils of industrial, agricultural and pastoral areas in Inner Mongolia were investigated. The total concentrations of ∑6NBFRs and ∑2DPs ranged from 1.06 to 981.51 pg·g-1 dw (dry weight), and from ND to 352.53 pg·g-1 dw, respectively, which were lower than those in other regions. The average total concentration of NBFRs in different functional zones decreased in the order industrial area > agricultural area > pastoral area, and the average concentration of different types of NBFRs decreased in the order TBPH > PBBA > HBB > PBT > PBBz > PBEB, respectively. The average total concentration of DPs in the industrial area was the highest among them. It was found that HBB was easy to degrade in the process of migration. PBBz, TBPH, DPs had weak migration ability, which mainly affected the surrounding environment of pollution sources. PBBz and PBT had strong migration ability, which mainly came from the long-distance transportation in low altitude areas, and have become the common pollutants in Inner Mongolia.
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