Abiotic association of phthalic acid esters with humic acid of a sludge landfill

doi:10.1007/s11783-012-0434-7

Front Envir Sci Eng

2012, Vol. 6

Issue (6) : 778-783 https://doi.org/10.1007/s11783-012-0434-7

RESEARCH ARTICL

Abiotic association of phthalic acid esters with humic acid of a sludge landfill

Xiaoli CHAI¹(

), Yongxia HAO¹, Xin ZHAO¹, Guixiang LIU¹, Ying ZHU², Rong JI³, Jun WU³, Huanhuan TONG¹, Youcai ZHAO¹

1. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China; 2. The Academy of Science of Shandong Province, Jinan 250013, China; 3. State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210093, China

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Abstract

The abiotic association between phthalic acid esters (PAEs) and humic substances (HS) in sludge landfill plays an important role in the fate and stability of PAEs. An equilibrium dialysis combined with ¹⁴C-labeling was used to study the abiotic association of two abundant PAEs (diethyl phthalate and di-n-butyl phthalate) with humic acid (HA) isolated from a sludge landfill with different stabilization times and different molecular weights. Elemental analysis and Fourier Transform Infrared Spectrophotometer (FTIR) suggested that high K_A value of HA was related to the high aromatic content and large molecular weight of HA. The results indicated that the association strength of PAEs with HA depended on both the properties of the PAEs and the characteristics of HA. The K_A values of the association were strongly dependent on solution pH, and decreased dramatically as the pH was increased from 3.0 to 9.0. The results suggested that non-specific hydrophobic interaction between PAEs and HA was the main contributor to the association of the PAEs with HA. The interactive hydrogen-bonds between the HA and the PAEs molecules may also be involved in the association.

Keywords abiotic association phthalic acid esters (PAEs) humic acid sludge landfill

Corresponding Author(s): CHAI Xiaoli,Email:xlchai@tongji.edu.cn

Issue Date: 01 December 2012

Cite this article:

Xiaoli CHAI,Yongxia HAO,Xin ZHAO, et al. Abiotic association of phthalic acid esters with humic acid of a sludge landfill[J]. Front Envir Sci Eng, 2012, 6(6): 778-783.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-012-0434-7
https://academic.hep.com.cn/fese/EN/Y2012/V6/I6/778

Tab.1 Characteristics of the sludge from Bai Long Gang Wastewater Treatment Plant

Fig.1 Fourier-transformed infrared spectra of HA

Tab.2 Elemental composition and rations of the HA

Tab.3 Association intensity (lg ) of C-labeled DBP (60 μg·L) with humic substances (0.1-1 mg·mL) at various pH values

Tab.4 Association intensity (lg ) of C-labeled DBP (60 μg·L) with Hb of different molecular weight

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