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The distribution of oxygen (O2) at the oxic/anoxic interface in the water column of two Swiss lakes was measured with sub-micromolar sensitivity, high precision, and high spatial resolution. The O2 distribution was found to be highly variable and it is shown that N-cycling and the redox gradients of Mn, Fe and CH4 are controlled by O2 distributions down to the nanomolar concentration range. The profiles...
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