Groundwater

Oral

394959 - Leaching potential of three anticoagulant compounds in the natural areas of Hawaii

Thursday, June 7
8:30 AM - 10:00 AM
Location: Lakeshore B
Co-Authors: Tiejun Wang, Tianjin – University; Katie Swift, Hawaii – US Fish and Wildlife Service; Chittaranjan Ray, Lincoln, Nebraska – Nebraska Water Center

The use of anticoagulant compounds as a pest control measure has dramatically changed worldwide rodent control practices. However, there are growing concerns over their increasing use and potential leaching into aquifers. Groundwater is the primary source of drinking water for the Hawaiian Islands and it is prone to contamination. As potential threats to public health as well as the environments, it is of great importance to evaluate the leaching potentials of three widely used anticoagulants such as brodifacoum, chlorophacinone, and diphacinone to groundwater aquifers using appropriate assessment tools. The Hawaii Department of Agriculture has been using the Comprehensive Leaching Risk Assessment System (CLERS) model to assess leaching potentials of chemicals. This model integrates soil, chemical, and recharge properties within a GIS framework. Literature values of soil sorption coefficient, required by the CLERS model, for anticoagulants vary over several orders of magnitude and it is based on temperate soils. Therefore, laboratory experiments were performed to determine the sorption capacity (Kd) and the degradation rate (T1/2) of brodifacoum, chlorophacinone, and diphacinone in Hawaiian soils. Disturbed soil samples were collected across the state of Hawaii, including the islands of Hawaii, Kaho‘olawe, Kauai, Lanai, Maui, Molokai, and Oahu. The results from the CLERS model indicate low risks of leaching of these three compounds into aquifers in five out of six major Hawaiian Islands. Brodifacoum and diphacinone showed medium risk of leaching in limited areas in Maui.

Matteo D'Alessio

Post-Doctoral Researcher
Nebraska Water Center

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