JEQ -- Karr et al. 30 (4): 1163 Figure IG9

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Fig. 8. ${delta}$ ¹⁵N-NO₃ vs. nitrate N concentrations, dissolved oxygen (DO) levels, and pH. The ${delta}$ ¹⁵N well above the median is exhibited only in samples with DO < 2 mg/L and pH > 5, supporting the general trend of denitrification enrichment of ${delta}$ ¹⁵N in a small number of samples.