Irrigation related arsenic contamination of a thin,alluvial aquifer,Madison River Valley,Montana, U.S.A. |
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| Authors: | John L Sonderegger Takeshi Ohguchi |
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| Institution: | (1) Montana Bureau of Mines and Geology, Montana College of Mineral Science and Technology, 59701 Butte, Montana;(2) Research Institute of Natural Resources Mining College, Akita University, 010 Akita, Japan |
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| Abstract: | The arsenic concentration in 13 water samples from wells in the thin, alluvial aquifer of the Madison River Valley, Montana,
U.S.A. ranged from 26 to 150 μg/l. The Madison River, which originates in Yellowstone National Park, has a mean arsenic concentration
of 51 μg/l (σ=26 μg/l), based upon very limited sampling in the study area during the main irrigation period. Groundwater
arsenic concentration increases down the valley can be best correlated with the intensity of ditch irrigation in this semiarid
area. No other sources of dissolved arsenic as concentrated as that of the river water have been identified. Evaporative concentration
of river-derived irrigation water is believed to have been the overwhelming factor in the contamination of this shallow aquifer. |
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