Source identification of pesticide pollution and determination of normal background concentrations of metals in yeşilırmak river basin

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2021-2-08
Yanar, Büşra Selin
Surface watersare one of the most vulnerable environmental compartment to the pollutionpressures arisingfrom numerous pointand nonpointsources.In this thesis, pesticide pollution and metal pollution as being two majorconcernsof the Yeşilırmak River Basin were addressed by pursuing target-oriented analysis and comprehensive assessmentapproaches.The main objective of this thesis istoestablishthe basin-spesific normalbackground concentrations(NBCs)and environmental quality standards(EQSs)forthemetals and to determine target-specific agricultural sources of the pesticides inthe Yeşilırmak River Basin.In this context, the basin-specificNBCsandEQSswere determined for 26 metals and metalloids.As a result of these analysis and assessments, the basin-specific EQSs were derived as 47.8 μg/L, 13.2 μg/L,and 98.6 μg/L for Al, Cu,and Fe, respectively.Within the scopeof the agricultural sourceidentification of the pesticide pollution,the insecticide, herbicide,and fungicide spraying schedules of each crop type raised in the districts of the river basin were analyzed by focusing ondistrict-specific assessments.Furthermore,the spatial distribution pathway and the temporal occurrence trend of thepesticides across the river basin were identified to establishthe basin-wide profile of the pesticide pollution. Precipitation regime, district altitude, mobility,and persistence of pesticides, which are the major factors affecting pesticide occurrences in the river, were also analyzed for the well-supportedsource identification ofthepesticide pollution. This thesis offersa goal-oriented baseline to fulfill the functional implementations of the river basin management strategies that are adjusted to site-specific conditions.
Citation Formats
B. S. Yanar, “Source identification of pesticide pollution and determination of normal background concentrations of metals in yeşilırmak river basin,” M.S. - Master of Science, Middle East Technical University, 2021.