Leaching Behavior of Chlorpyrifos and its Main Metabolite TCP through 5 Types of Soil Columns in Laboratory Conditions

Abstract:

By applying the OECD soil column method, the leaching behavior of chlorpyrifos and it main metabolite, 3,5,6-trichloro-2-pyridinol (TCP), in five types of saturated soil was compared. The results show the following: (1) Chlorpyrifos can be retained in the five types of saturated soil, and the rate of chlorpyrifos residues in the five types of soil columns are 86.9% (Black soil), 80.3% (Red soil), 77.9% (Limestone soil), 74.7% (fluvo-aquic soil) and 68.9% (Purple soil) of the application amount; (2) No chlorpyrifos was found in the leachate; (3) TCP could fully migrate in the five types of 30-cm-long soil columns and the TCP residues in these columns are 34.4% (Black soil), 29.6% (Red soil), 24.8% (Limestone soil),14.1% (fluvo-aquic soil) and 10.3% (Purple soil) of the application amount; (4) The average concentrations of TCP in the 400 mL leaching solution were from 0.31 μg·mL^-1 to 0.23 μg·mL^-1; and (5) The K_oc and GUS values of the TCP in the five types of soil showed that TCP has a great leaching risk compared with its parent compound of chlorpyrifos.

• Periodical: Applied Mechanics and Materials (Volumes 675-677)
• Pages: 175-180
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.675-677.175
• Online since: October 2014
• Authors: Bao Li Sun*, Hong Shan, Yi Wei Dong, Jin Li Huang, Cheng Feng Tong
• Keywords: Chlorpyrifos, Leaching, Soil Column, TCP

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