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Water quality risk assessment based on nitrogen and phosphorus in Longjiang River |
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Abstract Longjiang River is the biggest tributary of Liujiang River. In wet and dry season in 2012, the characteristic of temporal-spatial variation of nitrogen and phosphorus was studied, and eutrophication risk assessment was done as well. The results showed that nitrogen pollution in Longjiang River was severe and TN concentration was higher in wet season than that in dry season. The range of TN concentration was 1.33~3.15mg/L in wet season and 1.25~2.26mg/L in dry season. NO3-N/TN in wet and dry season was 0.67 and 0.84 respectively, which showed that NO3-N was the major form of nitrogen in Longjiang River. TP concentration was higher in dry season than in wet season. In dry season, TP concentration was 0.04~0.12mg/L and in wet season was 0.03~0.07mg/L. N/P ratio showed that phosphorus was the limited nutrient for the growth of phytoplankton in Longjiang River. According to trophic level index, TLI (∑), it was mesotrophic for most reach of Longjiang River. Potential risk of algal bloom exists in dry season in Longjiang River.
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Received: 30 June 2013
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