Spatial distribution of COD and the correlations with other parameters in the northern region of Lake Taihu

Spatial variation of chemical oxygen demand (COD) concentration was documented and significant correlations between COD concentration and chromophoric dissolved organic matter (CDOM) absorption, fluorescence, DOC concentration were found based on a cruise sampling in the northern region of Lake Taih...

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Published inHuanjing kexue Vol. 29; no. 6; p. 1457
Main Authors Zhang, Yun-lin, Yang, Long-yuan, Qin, Bo-qiang, Gao, Guang, Luo, Lian-cong, Zhu, Guang-wei, Liu, Ming-liang
Format Journal Article
LanguageChinese
Published China 01.06.2008
Subjects
Carbon - analysis
China
Chlorophyll - analysis
Fresh Water - analysis
Fresh Water - chemistry
Geography
Organic Chemicals - analysis
Water Pollutants, Chemical - analysis
China
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Summary:Spatial variation of chemical oxygen demand (COD) concentration was documented and significant correlations between COD concentration and chromophoric dissolved organic matter (CDOM) absorption, fluorescence, DOC concentration were found based on a cruise sampling in the northern region of Lake Taihu in summer including 42 samplings. The possible source of COD was also discussed using every two cruise samplings in summer and winter, respectively. The COD concentration ranged from 3.77 to 7.96 mg x L(-1) with a mean value of (5.90 +/- 1.54) mg x L(-1). The mean COD concentrations in Meiliang Bay and the central lake basin were (6.93 +/- 0.89) mg x L(-1) and (4.21 +/- 0.49) mg x L(-1) respectively. A significant spatial difference was found between Meiliang Bay and the central lake basin in COD concentration, CDOM absorption coefficient, fluorescence, DOC and phytoplankton pigment concentrations, decreasing from the river mouth to inner bay, outer bay and the central lake basin. Significant correlations between
ISSN:0250-3301