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[ subject:"Limnology." ]
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The Photofate of Pesticides and Diss...
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Yuan, Chenyi.
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The Photofate of Pesticides and Dissolved Organic Matter in Diverse Aquatic Systems.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
The Photofate of Pesticides and Dissolved Organic Matter in Diverse Aquatic Systems./
作者:
Yuan, Chenyi.
出版者:
Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:
154 p.
附註:
Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
Contained By:
Dissertation Abstracts International78-10B(E).
標題:
Environmental science. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10610261
ISBN:
9781369839876
The Photofate of Pesticides and Dissolved Organic Matter in Diverse Aquatic Systems.
Yuan, Chenyi.
The Photofate of Pesticides and Dissolved Organic Matter in Diverse Aquatic Systems.
- Ann Arbor : ProQuest Dissertations & Theses, 2017 - 154 p.
Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
Thesis (Ph.D.)--The Ohio State University, 2017.
The application of pesticides to agricultural fields has impaired receiving water quality and possibly affected both ecosystem function and biodiversity in lotic systems. Photochemical reactions may be important pesticide attenuation mechanisms in shallow sunlit waters. However, the ubiquitous presence of ill-defined dissolved organic matter (DOM) coupled with the presence of iron (Fe) have added to the difficulty in understanding and predicting the environmental fate of pesticides in diverse water bodies over diurnal cycles.
ISBN: 9781369839876Subjects--Topical Terms:
677245
Environmental science.
The Photofate of Pesticides and Dissolved Organic Matter in Diverse Aquatic Systems.
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The application of pesticides to agricultural fields has impaired receiving water quality and possibly affected both ecosystem function and biodiversity in lotic systems. Photochemical reactions may be important pesticide attenuation mechanisms in shallow sunlit waters. However, the ubiquitous presence of ill-defined dissolved organic matter (DOM) coupled with the presence of iron (Fe) have added to the difficulty in understanding and predicting the environmental fate of pesticides in diverse water bodies over diurnal cycles.
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This study investigated the impact of sunlight intensity, DOM, and Fe on the transformation of two pesticides: isoproturon and acetochlor. Change in light intensity, especially the natural diurnal cycle, was found to be important for isoproturon photofate due to its "apparent" photodegradation coupled to regeneration in the dark. For acetochlor, the addition of Fe in natural wetland waters was found to be especially beneficial at moderately and highly acidic pH values. In a highly acidic aqueous environment i.e., acid mine drainage (AMD) impacted waters, which are common in coal-producing regions of the country, the presence of high Fe levels impacted both phototransformation and photomineralization of acetochlor and DOM for which rates were orders of magnitude faster than most natural water bodies. This high photoreactivity may make AMD impacted waters a potential resource for pesticide attenuation, but the effects on receiving water ecosystems by transformed/mineralized DOM also need to be considered.
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