Sorption and Desorption of Phenanthrene to Black Carbon on Crop Soil from the South-North Water Diversion Project in China

Rong Hao,Pei-Chao Wang ,Jinliang Zhang

doi:10.19026/ajfst.6.127

Abstract

The water quality of South-North Water Diversion Project (SNWDP) has attracted more and more attention. Polycyclic Aromatic Hydrocarbons (PAHs) in soils strongly sorb to black carbon. In this study, adsorption and desorption characteristics and isotherm of phenanthrene to black carbon in SNWDP crop soils were studied extensively. The results showed that the sorption and desorption of phenanthrene to black carbon were nonlinear. Freundlich model could ﬁt the sorption and desorption data of BC well. Meantime, desorption process exhibited varied apparent sorption-desorption hysteresis. It can be inferred that BC of crop soils in SNWDP plays a signiﬁcant role in reducing the bioavailability and toxicity of phenanthrene through sorption capacity and desorption hysteresis.

Highlights

Black Carbon (BC) originates from incomplete combustion of fossil fuels and biomass (Goldberg, 1985)
It was the aim of this study to investigate sorption-desorption characteristics Polycyclic Aromatic Hydrocarbons (PAHs) to BC on South-North Water Diversion Project (SNWDP)
0.48 sorption isotherms measured in our study have n values slightly higher than the n values reported in the literature for sorption by different origins black carbon (Bornemann et al, 2007; Luo et al, 2011)

Summary

Introduction

Black Carbon (BC) originates from incomplete combustion of fossil fuels and biomass (Goldberg, 1985). It was the aim of this study to investigate sorption-desorption characteristics PAHs to BC on SNWDP. Studying area and soil sampling: The Danjiangkou reservoir which is the source of water for the middle route of the well-known SNWDP in China was selected.

Results

Conclusion