In accordance with this discovery, it is an object of the invention to provide {TAIL ~ an economical system} for the rapid extraction of {HEAD ~ exchangeable ions} from soils or sediments under ambient oxidation reduction potentials 
In accordance with this discovery , it is an object of the invention to provide { TAIL ~ an economical system } for the rapid extraction of { HEAD ~ exchangeable ions } from soils or sediments under ambient oxidation reduction potentials
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