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. Author manuscript; available in PMC: 2013 Aug 7.
Published in final edited form as: Environ Sci Technol. 2012 Jul 17;46(15):8305–8314. doi: 10.1021/es202447r

Figure 2.

Figure 2

Hourly load (mg) of methamphetamine (A) and methamphetamine/creatinine (B) for Wednesday March 17th – Saturday March 21st. Colored bars indicate measured load and the corresponding error (See SI for error calculations). Clear (but very small) bars indicate the estimated load loss during collection and storage at 4 °C and the corresponding error calculated from the 95% CI of the rate constant measured during the stability study. Black hatched bars indicate 8 am as a time reference for each day.1

1The bottle collecting the 7–8 am sample on Saturday broke during collection.