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Fig. 6.
Plots of (A) DON vs. DOC, (B) C peak intensity vs. DOC, (C) T peak intensity vs. DOC, and (D) THAA vs. DOC in Hampyeong Bay groundwater in July 2011. The correlation lines and coefficients in panels (A) and (B) are for all of the samples, and those VS5584 in panels (C) and (D) are only for the multi-level pore-water samples taken on July 5, 2011.
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In the subsurface pore-waters, compared with the surface and deep layers, the THAA concentrations were lowest, the D/L ratios were highest, the DI values were lowest, and the contribution of glycine to the THAA was highest (except for station B1) (Fig. 2 and Fig. 3). The salinities did not show any significant correlations with the D/L ratios or the DI values (not shown in figures). Thus, our results indicate a relatively large presence of bio-degraded DOM in the subsurface layer.
In the deep pore-water layer (> 35 cm), the concentrations of DOC, DON, C peak, T peak, and THAA were higher compared with tendons of the subsurface layer, whereas the alanine D/L ratios and glycine concentrations were generally lower than those in the upper depths (Fig. 2 and Fig. 3). These trends suggest the active production and accumulation of less reactive DOM and less effective bacterial degradation in the deep layer.