Environmental Science and Pollution Research

, Volume 19, Issue 6, pp 2079–2087 | Cite as

Study on the spectral and Cu (II) binding characteristics of DOM leached from soils and lake sediments in the Hetao region

  • Xujing Guo
  • Jinyuan Jiang
  • Beidou Xi
  • Xiaosong He
  • Hui Zhang
  • Yu Deng
Research Article

Abstract

Introduction

Dissolved organic matter (DOM) is the most active component in environmental system and its chemical and structural characteristics most likely influence its biodegradation. Four surface soil (0–20 cm) and three core sediment samples (0–10 cm) were collected from Wuliangsuhai Lake. The objectives of this study were to investigate the spectral properties and humification degree of DOM and to determine and discuss comparatively the complexing capacities and stability constants of DOM by Cu (II) in the Hetao region.

Materials and methods

In this study, fluorescence spectra and fluorescence quenching methods were used to evaluate the humification degree of DOM and calculate the complexing capacities and the stability constants between DOM and Cu (II).

Results and discussion

Two defined peaks, at wavelengths of 260∼300 nm (peak I) and 300∼350 nm (peak II), could be identified for soil DOM at a Δλ value of 30 nm. In sediment DOM extracts, a third peak (III) was observed near 364 nm. The results show that there is a significant difference in the structure of DOM because of different sources. The humification degree is significantly higher for soil samples than those of sediment samples. The FT-IR spectra of DOM show that structure in sediment DOM is more functional groups than those in soil DOM. DOM has a stronger Cu binding affinity in soils than in sediment in the Hetao region, which may lead to potentially significant influence on the migration and transformation of Cu (II).

Keywords

DOM Synchronous fluorescence spectra Humification degree FT-IR spectra Binding capacity Conditional stability constants 

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Xujing Guo
    • 1
  • Jinyuan Jiang
    • 2
  • Beidou Xi
    • 3
  • Xiaosong He
    • 4
  • Hui Zhang
    • 1
  • Yu Deng
    • 1
  1. 1.Key Laboratory of Energy Microbiology and ApplicationBiogas Scientific Research Institute of the Ministry of AgricultureChengduChina
  2. 2.Research Center of Water pollution Control TechnologiesChinese Research Academy of Environmental SciencesBeijingChina
  3. 3.Water Environment System Project LaboratoryChinese Research Academy of Environmental SciencesBeijingChina
  4. 4.School of EnvironmentBeijing Normal UniversityBeijingChina

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