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. 2014 Jul 15;487(100):642–650. doi: 10.1016/j.scitotenv.2014.02.101

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© 2014 The Authors

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/).

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Fig. 3 — Directed acyclic graph for Bayesian analysis of 2 metabolites simultaneously.

Consumption_d = cocaine consumption per 1000 people on day d (mg); Load_md = load of metabolite m entering the wastewater system on day d (grammes); Population = size of the population served by the WWTP (millions); Concentration_md = concentration of metabolite m in sample of wastewater on day d (ng/l); Flow_d = total volume of flow to the wastewater influent on day d (millions of litres); Stability_m = percentage change in concentration of metabolite m in wastewater in the conditions relevant to the study; Excretion_m = proportion of consumed cocaine that is excreted as metabolite m; MWm = molecular weight of metabolite m; MWc = molecular weight of cocaine; ps = proportion of all cocaine mass that is smoked as free base, es_m = proportion of a dose of cocaine smoked as free base that is excreted as metabolite m; en_m = proportion of a dose of cocaine taken by nasal insufflation that is excreted as metabolite m.