Influential role of black carbon in the soil-air partitioning of polychlorinated biphenyls (PCBs) in the Indus River Basin, Pakistan

被引：32

作者：

Ali, Usman ^{[1
]}

Syed, Jabir Hussain ^{[2
]}

Mahmood, Adeel ^{[3
]}

Li, Jun ^{[2
]}

Zhang, Gan ^{[2
]}

Jones, Kevin C. ^{[4
]}

Malik, Riffat Naseem ^{[1
]}

机构：

[1] Quaid I Azam Univ, Dept Environm Sci, Environm Biol & Ecotoxicol Lab, Islamabad 45320, Pakistan

[2] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China

[3] COMSATS Inst Informat Technol, Dept Biosci, Islamabad, Pakistan

[4] Univ Lancaster, Lancaster Environm Ctr, Ctr Chem Management, Lancaster LA1 4YQ, England

来源：

CHEMOSPHERE | 2015年 / 134卷

基金：

英国自然环境研究理事会;

关键词：

PCBs; Soil-air partition model; Adsorption; Octanol-air partition coefficient; Black carbon-air partition coefficient; Indus River Basin; POLYCYCLIC AROMATIC-HYDROCARBONS; POLYBROMINATED DIPHENYL ETHERS; ORGANOCHLORINE PESTICIDES OCPS; PERSISTENT ORGANIC POLLUTANTS; RISK-ASSESSMENT; EXCHANGE FLUXES; SURFACE SOILS; SOOT CARBON; MECHANISTIC CONSIDERATIONS; AGRICULTURAL SOILS;

D O I：

10.1016/j.chemosphere.2015.03.020

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Levels of polychlorinated biphenyls (PCBs) were assessed in surface soils and passive air samples from the Indus River Basin, and the influential role of black carbon (BC) in the soil-air partitioning process was examined. Sigma(26)-PCBs ranged between 0.002-3.03 pg m(-3) and 0.26-1.89 ng g(-1) for passive air and soil samples, respectively. Lower chlorinated (tri- and tetra-) PCBs were abundant in both air (83.9%) and soil (92.1%) samples. Soil-air partitioning of PCBs was investigated through octanol-air partition coefficients (K-OA) and black carbon-air partition coefficients (KBC-A). The results of the paired-t test revealed that both models showed statistically significant agreement between measured and predicted model values for the PCB congeners. Ratios f(BC)K(BC-A)delta(OCT)/f(OM)K(OA) >5 explicitly suggested the influential role of black carbon in the retention and soil-air partitioning of PCBs. Lower chlorinated PCBs were strongly adsorbed and retained by black carbon during soil-air partitioning because of their dominance at the sampling sites and planarity effect. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：172 / 180

页数：9

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