Evaluating Nitrate Recovery by Ion-Exchange Resin Bags
Ion-exchange resin (IER) bags were tested as traps for leached soil NO−3-N. In laboratory experiments, IER bags recovered 84.7% of the NO−3-N from solutions containing 0.09 to 40.74 g NO−3-N kg−1 resin, but recovery decreased at higher concentrations. In soil columns, NO−3-N recovery was poor (36.2%) when NO−3-N moved slowly through the soil profile after a rapid single pulse, but improved (87.1%) when higher flow was sustained. In the field, estimates of leached NO−3-N using IER bags fell within the range of values estimated from soil cores and suction lysimeters. Advantages of IER bags are attributed to cumulative recovery of NO−3-N during passive interception of gravitational water flow.
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