COMPARISON OF TWO SAMPLE OXIDATION METHODS FOR QUANTITATIVE MEASUREMENT OF 12C AND 14C IN PLANT AND SOIL

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Abstract
Two methods for determining total C and 14C in plant and soil were compared. One method involved wet oxidation of samples in concentrated acid and measuring evolved 12/14CO2 captured in NaOH. The other method oxidized samples in an induction furnace, measured total CO2-C by thermal conductivity, then 14CO2-C collected in a NaOH solution. Over a range of carbon contents and including both plant and soil samples, the wet and dry oxidation methods were highly correlated (r2 = 0.99) and the slope of the regression wet on dry methods (±SE) was 1.00 ± 0.01 and 1.05 ± 0.01 for total-C and 14C, respectively. However, the dry oxidation method may not be as accurate as the wet method for soil samples especially at low levels of C, less than 5 mg C g−1 sample. Key words: Total carbon, carbon-14, high-temperature induction furnace, acid digestion
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