The extractor enables simple, rapid, multiple element assays and provides the new capability of extracting {HEAD ~ exchangeable ions} from {TAIL ~ stream, lake, and marine sediments} in situ 
from
The extractor enables simple , rapid , multiple element assays and provides the new capability of extracting { HEAD ~ exchangeable ions } from { TAIL ~ stream , lake , and marine sediments } in situ
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH