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Study on water quality and genotoxicity of surface microlayer and subsurface water in Guangzhou section of Pearl River

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Abstract

In order to understand the water quality and the genotoxicity of various surfaces in the Guangzhou section of the Pearl River during January to December of 2008, we investigated and studied the current water situation of the surface microlayer (SML) and the subsurface water (SSW) in Guanzhou section (Zhongda Dock and Yuzhu Dock) of the Pearl River by chemical analysis and biological monitoring method (Vicia faba micronucleus test). The results showed that during these months concentrations of the indexes of the two docks water such as total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (COD) exceeded the national III level of surface water quality, and the indexes of SML were much higher than the ones of SSW (P < 0.05), and the exceeding rate of TN, TP of SML was 100%. According to the eutrophic evaluation standard, the water bodies of SML and SSW in the two docks were in a eutrophication during these months. The eutrophication and pollution of SML was more serious, and the highest index of eutrophication (E value) was up to 81.9, which also had obvious difference with COD and TP (P < 0.05). The water of SML in the two docks enriched to N, P, and chlorophyll a (Chl. a) seriously, and the enrichment factor of SML in Zhongda Dock to N, P, and Chl. a was 0.71 ∼ 2.78, 0.98 ∼ 1.18, and 0.49 ∼ 13.99, respectively, and the one in the Yuzhu Dock was 1.09 ∼ 1.52, 1 ∼ 1.14, and 0.72 ∼ 4.07, respectively. Through inspecting the water genotoxicity of various layers by V. faba micronucleus test, we could know that the average annual MCN‰ of SML and SSW in the two docks was 6.09‰, 5.53‰, 5.57‰, and 5.249‰, respectively. In general, the above value of SML was a little higher than the one of SSW, but there was not a remarkable difference (P > 0.05). This research shows that the water quality in a medium to heavy eutrophication in the Guangzhou section of Pearl River belongs to national III ∼ IV level, and SML has the capability of enrichment to the pollutants such as N and P and induces the increase of micronucleus rate of V. faba tip cell. The study also indicates that there may be genotoxicity matters such as N, P in water body.

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Yu, J., Ho, Wt., Lu, Hm. et al. Study on water quality and genotoxicity of surface microlayer and subsurface water in Guangzhou section of Pearl River. Environ Monit Assess 174, 681–692 (2011). https://doi.org/10.1007/s10661-010-1487-3

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  • DOI: https://doi.org/10.1007/s10661-010-1487-3

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