Table of Contents
Journal of Geochemistry
Volume 2014, Article ID 502597, 13 pages
http://dx.doi.org/10.1155/2014/502597
Research Article

Spatial Distributions of Humic Substances and Evaluation of Sediment Organic Index on Lake Dalinouer, China

1College of Life Sciences of Inner Mongolia University, University West Road No. 235, Saihan District, Hohhot, Inner Mongolia 010021, China
2College of Environment & Resources, Inner Mongolia University, University West Road No. 235, Saihan District, Hohhot, Inner Mongolia 010021, China
3Institute of Environmental Geology, College of Environment & Resources, Inner Mongolia University, University West Road No. 235, Saihan District, Hohhot, Inner Mongolia 010021, China
4Institute of Environmental Resources and Analytical Technique, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot 010031, China

Received 14 May 2013; Accepted 19 August 2013; Published 2 January 2014

Academic Editors: F. Brandt, A. Garralón, P. S. Hooda, M. Jang, B. Ouddane, and F. Tassi

Copyright © 2014 Dekun Hou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of this study is to examine and interpret the spatial distribution of sedimentary humic substances in Lake Dalinouer. Humic substances in sediments were analyzed separately in different fractions: humins (HM), humic acid (HA), fulvic acid (FA), and different forms of organic carbon. The results showed that total organic carbon (TOC) contents varied from 7.25 to 65.54 g kg−1 with a mean of 36.37 ± 17.74 g kg−1. It was found that high TOC concentrations were at lake’s center and low TOC concentrations occurred at the estuary of inflows. Different redox conditions caused by water depth were of the most important factors which might influence TOC contents. Concentrations of HM, HA, and FA in sediments were detected in range of 6.40–58.16 g kg−1, 0.27–3.50 g kg−1, and 0.27–4.26 g kg−1, respectively. Of them, HM was the dominant form and accounted for 74–94% of TOC and 80–90% of humus. Organic Sediment Index (OSI) was used to assess the organics accumulation, and the value of OSI ranged from 0.001 to 0.30, which indicated that Lake Dalinouer was relatively clean. The relative high degree of humidification was found in the eastern of lake, where it should be taken into consideration seriously.