Difference between revisions of "POPs in Baltic herring"
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[[File:Mean_TEQ_herring.jpg|800px]] | [[File:Mean_TEQ_herring.jpg|800px]] | ||
+ | You can print out the numerical results of prior and posterior congener concentrations below. In addition the possible updated versions of the above figures are printed out. | ||
<rcode label="Show results" embed=1 graphics=1 > | <rcode label="Show results" embed=1 graphics=1 > | ||
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library(OpasnetUtils) | library(OpasnetUtils) | ||
library(ggplot2) | library(ggplot2) | ||
+ | library(reshape2) | ||
objects.latest("Op_en2583", "pop_bayes") | objects.latest("Op_en2583", "pop_bayes") | ||
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+ | oprint(dcast(resultsall@output, Congener~variable, fill=0, value.var = "resultsallResult")) | ||
ggplot(subset(resultsall@output, grepl("PCB", Congener) & grepl("Medianpost", variable)), aes(x = Congener, y = resultsallResult, fill = Congener)) + geom_bar(stat = "identity") + | ggplot(subset(resultsall@output, grepl("PCB", Congener) & grepl("Medianpost", variable)), aes(x = Congener, y = resultsallResult, fill = Congener)) + geom_bar(stat = "identity") + |
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Contents
Question
What are the concentrations of persistent organic pollutants (POPs) in Baltic herring.
Answer
Answer is under work and results are preliminary.
POP concentrations in Baltic sea fish have been measured from samples collected in EU-kalat project. The original data of individual fish samples si accessible through Opasnet base. This data is used here for a Bayesian model to calculate posterior distributions (median and SD) for each congener. This data is then translated into TEQ, and can be used for health benefit assessment of Baltic herring.
Posterior congener median concentrations are presented below for each compound group (PCDD/F, PCB, BDE) analysed in EU-kalat.
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Based on the mean posterior concentrations of individual congeners, TEQs are calculated for each congener by using TEF values by WHO and plotted below.
You can print out the numerical results of prior and posterior congener concentrations below. In addition the possible updated versions of the above figures are printed out.
Rationale
This model takes in measured congener concentrations of POPs in Baltic herring in northern part of Baltic sea. Measured data is used for Bayesian model to produce posterior medians and sds for each congener and also to calculate TEQ values. Numerical results are saved as variables to Opasnetbase and result figures are presented above in the Answer section.