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Limited mobility of dioxins near San Jacinto super fund site (waste pit) in the Houston Ship Channel, Texas due to strong sediment sorption
Environmental Pollution ( IF 8.9 ) Pub Date : 2018-02-21 , DOI: 10.1016/j.envpol.2018.02.003
Patrick Louchouarn , Shaya M. Seward , Gerard Cornelissen , Hans Peter H. Arp , Kevin M. Yeager , Robin Brinkmeyer , Peter H. Santschi

Sediments from a waste pit in Houston Ship Channel (HSC) were characterized using a number of molecular markers of natural organic matter fractions (e.g., pyrogenic carbon residues, PAHs, lignins), in addition to dioxins, in order to test the hypothesis that the dispersal and mobility of dioxins from the waste pit in the San Jacinto River is minimal. Station SG-6, sampled at the site of the submerged waste pit, had the highest dioxin/furan concentrations reported for the Houston Ship Channel/Galveston Bay (HSC/GB) system (10,000–46,000 pg/g), which translated into some of the highest reported World Health Organization Toxic Equivalents (TEQs: 2000–11,000 pg/g) in HSC sediments. Using a multi-tracer approach, this study confirmed our hypothesis that sludges from chlorinated pulps are a very likely source of dioxins/furans to this pit. However, this material also contained large quantities of additional hydrophobic organic contaminants (PAHs) and pyrogenic markers (soot-BC, levoglucosan), pointing to the co-occurrence of petroleum hydrocarbons and combustion byproducts. Comparison of dioxin/furan signatures in the waste pit with those from sediments of the HSC and a control site suggests that the remobilization of contaminated particles did not occur beyond the close vicinity of the pit itself. The dioxins/furans in sediments outside the waste pit within the HSC are rather from other diffuse inputs, entering the sedimentary environment through the air and water, and which are comprised of a mixture of industrial and municipal sources. Fingerprinting of waste pit dioxins indicates that their composition is typical of pulp and paper sources. Measured pore water concentrations were 1 order of magnitude lower than estimated values, calculated from a multiphase sorption model, indicating low mobility of dioxins within the waste pit. This is likely accomplished by co-occurring and strong sorbing pyrogenic and petrogenic residues in the waste pit, which tend to keep dioxins strongly sorbed to particles.



中文翻译:

由于强烈的泥沙吸附,得克萨斯州休斯敦船舶航道的圣哈辛托超级基金场址(废物坑)附近二恶英的活动性有限

除二恶英外,还使用许多天然有机物组分(例如热解碳残留物,PAHs,木质素)的分子标记物对休斯敦船舶航道(HSC)废物坑中的沉积物进行了表征,以检验以下假设:来自圣哈辛托河废料池的二恶英的扩散和流动性极小。SG-6站是在淹没的废物坑现场采样的,据报道,休斯顿船舶航道/加尔维斯顿湾(HSC / GB)系统的二恶英/呋喃浓度最高(10,000–46,000 pg / g),这转化为一些世界卫生组织报告的HSC沉积物中最高的有毒当量(TEQs:2000-11,000 pg / g)的百分比。使用多示踪方法,这项研究证实了我们的假设,即氯化纸浆产生的污泥很可能是该坑中二恶英/呋喃的来源。然而,这种材料还包含大量其他疏水性有机污染物(PAHs)和热原性标志物(煤烟BC,左旋葡聚糖),表明石油碳氢化合物和燃烧副产物同时存在。将废物坑中的二恶英/呋喃特征与HSC和控制地点的沉积物中的二恶英/呋喃特征进行比较表明,污染颗粒的迁移不会发生在废物坑本身附近。HSC内废物坑外部沉积物中的二恶英/呋喃来自其他扩散输入,它们通过空气和水进入沉积环境,并且由工业和市政资源混合而成。对废坑二恶英的指纹图谱表明,其成分是纸浆和纸张来源的典型特征。根据多相吸附模型测得的孔隙水浓度比估计值低1个数量级,表明二恶英在废物坑内的迁移率较低。这很可能是通过在废物坑中同时发生并强烈吸收热原和生岩石残留物来实现的,这些残留物往往会使二恶英保持强烈吸附在颗粒上。

更新日期:2018-02-21
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