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Laboratory Evaluation of Pesticide Leaching from Sand‐Based Constructed Root Zones Amended with Activated Carbon
Author(s) -
Lee Jeong Ho,
Joo Young K.,
Chun Soul,
Christians Nick E.
Publication year - 2010
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj2010.0026
Subject(s) - tebuconazole , leachate , leaching (pedology) , chemistry , activated carbon , pesticide , peat , environmental chemistry , environmental science , environmental engineering , agronomy , soil science , soil water , adsorption , ecology , organic chemistry , biology
Research was conducted to evaluate the installation of an activated carbon (AC) layer to reduce pesticide leaching from sand‐base constructed root zones. Soil profile columns included unamended pure sand (PS), sand amended with 10% v/v peat moss (PM), sand overlying a 3‐cm layer of AC (Ch‐1), and sand overlying a 13‐cm layer of sand mixed with the same amount of AC as that in the 3‐cm layer (Ch‐2). Soil profiles treatments included tebuconazole at 0.125 mg a.i. m −2 , ethoprophos at 300 mg a.i. m −2 and ethoprophos at 1500 mg a.i. m −2 Total detected leachate from the PS was 52 and 80% of applied tebuconazole and ethoprophos, respectively. Both materials were detected at <1% of applied from Ch‐2 leachate. Peat moss was as good as or more effective than the AC profile (Ch‐1) for capturing tebuconazole, but not ethoprophos. Tebuconazole was detected at <1% of applied in the PM leachate, whereas ethoprophos was detected at 27% of applied from PM leachate. Ethoprophos applied at 1500 mg m −2 was detected at 97, 83, 45, and 5% of applied from PS, PM, Ch‐1, and Ch‐2 leachate, respectively. The amount of ethoprophos remaining in the columns treated at 1500 mg m −2 after leaching was 1, 9, 52, and 89% in PS, PM, Ch‐1, and Ch‐2, respectively. Our results indicate that a proper installation of PM or AC layers may be effective in reducing the leaching of pesticides from sand‐base constructed root zones.