Figure 2: Spatial profiles of 17α-TBOH through a 24-hour cycle. | Nature Communications

Figure 2: Spatial profiles of 17α-TBOH through a 24-hour cycle.

From: Coupled reversion and stream-hyporheic exchange processes increase environmental persistence of trenbolone metabolites

Figure 2

Spatial profiles for 17α-TBOH without (left column) and with (right column) product-to-parent reversion. Profiles are shown through a typical 24-hour cycle divided into periods of daylight (top row, 0600–1800 hours) and darkness (bottom row, 1,800–0,600 hours), with individual profiles at 2-hour intervals. Vertical dashed lines indicate distances for 12 and 24 h of downstream advection in the stream channel. Concentration profiles reflect the interaction of physical transport processes (primarily advection, hyporheic exchange) with chemical processes (time-variable photolysis, persistent reversion). The stream profile is dominated by advection of the input concetrations of 17α-TBOH during periods of darkness (bottom row) and by photolysis during periods of light (top row). Reversion of hydroxy-17α-TBOH to 17α-TBOH increases hyporheic concentrations throughout the domain, particularly at distances downstream of about 10 km.

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