Water Quality Assessment and Nitrogen Pollution Sources Analysis of the West Lake, Hangzhou, China

Abstract:

Single factor water quality identification index (SFWQII) and Comprehensive water quality identification index (CWQII) were applied to the data of 6 parameters for water quality of West Lake at 10 different sites and 4 main inflows in the West Lake basin, generated during March 2012 to February 2013. This study evaluated and elucidated the temporal and spatial variation of each parameter on water quality and the main pollution factor of West Lake by SFQII. CWQII based on the SFQII was applied to evaluate the eutrophication level of West Lake and substantiated mesotrophic waters. Stable isotopes of nitrate were used to identify the nitrate sources of West Lake. The δ¹⁵N_NO3 values in samples from the West Lake and inflows had a range of 2.6‰ to 12.0‰, while the δ¹⁵N_NO3 values in Qiantang River was 5.3‰, in rainfall was 5.2‰ and in runoff was 3.6‰, respectively. Animal wastes, commercial fertilizer and domestic sewage were the main nitrate sources. The groundwater and denitrification might increase the levels of NO₃^- in West Lake.

• Periodical: Advanced Materials Research (Volumes 1073-1076)
• Pages: 504-509
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1073-1076.504
• Online since: December 2014
• Authors: Zan Fang Jin, Xue Qin, Ling Xiao Chen, Fei Li Li*
• Keywords: Nitrate, Nitrogen Isotope, Water Quality Assessment, West Lake

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