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Persulfate Digestion and Simultaneous Colorimetric Analysis of Carbon and Nitrogen in Soil Extracts

Dep. of Ecology, Evolution and Marine Biology, Univ. of California, Santa Barbara, CA 93106

View larger version (30K): [in a new window]   Fig. 1. Flow injection manifold for detecting carbon dioxide in persulfate digest. Injection valve is shown in the inject position. Reagents, standards, and diffusion block are described in the text. Nominal flow rates are listed; actual flow rates are approximately 2.5 times greater; tubing colors are in parentheses. Manifold tubing is 0.8 mm i.d. (5.2 µL cm–1); 5-cm mixing coil has 70 cm of tubing.

View larger version (22K): [in a new window]   Fig. 2. Total dissolved organic (a) C and (b) N recoveries from fumigated and unfumigated soil extracts by persulfate digestion vs. high temperature catalytic oxidation (HTCO). Persulfate values are averages of three separate persulfate trials, three to five replicates per trial (n = 12–15), while HTCO values are single determinations. Vertical error bars are the standard deviations of all replicates taken together. Total observations = 25.

View larger version (22K): [in a new window]   Fig. 3. Microbial flush (a) C and (b) N values determined by persulfate oxidation vs. high temperature catalytic oxidation (HTCO) from fumigated and unfumigated soils. Persulfate values are averages of three separate trials (n = 6–10). Error bars represent one standard deviation. Solid lines include all data while dashed lines exclude the highest point. Total observations = 10.