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The photosynthetic rates of the microflora in sediments were determined by a new oxygen microprofile method which involves the use of 2–10‐ µ m‐thick oxygen microelectrodes. The spatial resolution of the measurements is ca. 0.1 mm when the photosynthesis is determined within 1 s. The high resolving power of the method makes it possible to analyze in detail the vertical distribution of photosynthetic activity in sediments. Gas bubbles within the sediment normally interfere with the measurement of photosynthetic rate by oxygen methods, but the high spatial resolution of this method makes such interference negligible.
Revsbech et al. (Fri,) studied this question.