Evaluation of anthropogenic impacts on reservoir water quality by monitoring the occurrence of emerging contaminants

  • 鍾 佳蓁

Student thesis: Master's Thesis


Recently the need for high quality finished water has brought the land-use management around reservoir catchment to the public attention Human would impact the source water quality by different levels based on the types of activities It is crucial for competent authority understand how human activities would affect the water quality in order to regulate the land use for pollution control The objective of this study is to evaluate the impacts of anthropogenic sources on water quality around reservoir catchment area by monitoring the occurrence of selected contaminants including four pesticides (glyphosate glufosinate fenthion and thiophanate-methyl) and their two metabolites (aminomethylphosphonic acid (AMPA) and fenthion sulfoxide) one antibiotic (oxytetracycline) and one endocrine disrupting substance (bisphenol A) to reflect the pollution from agricultural run-off aquaculture wastes and domestic sewage respectively Basic water quality parameters were also acquired Samples were collected monthly from March 2017 to February 2018 from the two tributaries (Wanglai Creek and Zhuoshui Creek) in Agondian reservoir catchment located in southern Taiwan Results (sample number N=119) showed that the occurrence of organic pollutants in surface water was mainly related to their chemical properties Compounds with high water solubility were easily detected with ppb level concentration and high detection frequency including glyphosate (0 23±0 57 μg/L 32 8%) glufosinate (0 20±0 85 μg/L 16 8%) AMPA (0 25±0 55 μg/L 38 0% N=78) and oxytetracycline (1 82±2 28 μg/L 59 7%) By contrast the hydrophobic compounds thiophanate-methyl (0 003±0 013 μg/L 8 4%) and fenthion sulfoxide (0 010±0 032 μg/L 10 7% N=56) existed only ppt level concentration and for the fast-degrading compound fenthion no residue was observed Bisphenol A is an exception with low detected concentration (0 035±0 076 μg/L) but high detection frequency 33 6% (comparable to glyphosate) which may be due to its hydrophobicity and longer half-life in the environment From spatial aspect the distribution of the monitored organic pollutants occurred mainly corresponding to the ambient land use so they could be used to trace the pollution source and hotspot From the time perspective the application of agrochemicals and manure is usually in spring and early summer Water body became vulnerable to the surface runoff caused by high rainfall which is typical during summer in southern Taiwan On the contrast bisphenol A was prone to be diluted instead of being washing out from soil in wet season In addition in the hotspot of agricultural pollution and wet season the sum of glyphosate and its derivative product glufosinate positively correlated to total phosphorus and ammonia nitrogen (Spearman correlation coefficient=0 7 p value
Date of Award2018 Aug 15
Original languageEnglish
SupervisorWan-Ru Chen (Supervisor)

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