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DETERMINATION OF 14 C IN SOIL BY A GEL SUSPENSION METHOD
Author(s) -
CHESHIRE M. V.,
SHEPHERD H.,
KNIGHT A. H.,
MUNDIE C. M.
Publication year - 1972
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1972.tb01672.x
Subject(s) - liquid scintillation counting , suspension (topology) , coefficient of variation , soil test , soil water , dispersion (optics) , scintillation counter , chromatography , thixotropy , chemistry , mineralogy , analytical chemistry (journal) , environmental science , mathematics , materials science , soil science , physics , optics , composite material , homotopy , detector , pure mathematics
Summary Radioactivity in soils labelled with 14 C was determined by suspending the finely ground soil in a thixotropic gel, dispersing it by ultrasonics and counting the dispersion in a liquid scintillation spectrometer. The relationship between the weight of sample and counting efficiency was found to be almost linear. Using 30 mg soil, the counting efficiency is 50 per cent and 14 C may be determined with an average coefficient of variation of 1.5 per cent to within 5 per cent of the value determined by oxidative procedures.