Sampling Mixtures of Soil and Carbon-14-Labeled Plant Materials
1975
Nyhan, J. W.
An automated commercial Dumas apparatus was converted to burn soil samples amended with ¹⁴C-labeled plant material for radiocarbon assay. The changes necessary for this conversion are described as well as experiments to determine the efficiency of radiocarbon recovery in combusted samples. A procedure was developed for mixing labeled plant material with soil and sampling the soil-plant mixture. The radiocarbon content of a mixture of 2.250 kg of soil and 0.5 g of radioactive herbage was determined on 500-mg subsamples taken from composite mixture subsamples. The average radiocarbon recovery value in this experiment was 107% with a coefficient of variation of 13%.
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