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Use of NMR relaxation times to differentiate mobile and immobile pore fractions in a wetland soil
Author(s) -
Culligan Patricia J.,
Sinfield Joseph V.,
Maas Werner E.,
Cory David G.
Publication year - 2001
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2000wr900326
Subject(s) - relaxation (psychology) , peat , reagent , soil test , materials science , nuclear magnetic resonance , characterisation of pore space in soil , porous medium , porosity , magnet , flow (mathematics) , soil science , analytical chemistry (journal) , chemistry , soil water , environmental science , chromatography , composite material , mechanics , physics , organic chemistry , psychology , social psychology , ecology , biology , quantum mechanics
A method is presented that makes use of nuclear magnetic resonance (NMR) measurements to differentiate between mobile and immobile pore fractions in an organic peat specimen. The method is based on the T 1 relaxation mechanism and uses a paramagnetic reagent to mark the effective (mobile) pore space in the specimen under examination. A setup has been developed that allows controlled fluid flow through an NMR specimen while it is positioned in a magnet. Results from tests using fluid‐filled glass tubes illustrate the application of the method and verify its accuracy. Results from a test using a peat moss specimen demonstrate the use of the method during a flow experiment in a wetland soil.