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