An approach for calculating a confidence interval from a single aquatic sample for monitoring hydrophobic organic contaminants.

Abstract:

:The use of passive sampling devices (PSDs) for monitoring hydrophobic organic contaminants in aquatic environments can entail logistical constraints that often limit a comprehensive statistical sampling plan, thus resulting in a restricted number of samples. The present study demonstrates an approach for using the results of a pilot study designed to estimate sampling variability, which in turn can be used as variance estimates for confidence intervals for future n = 1 PSD samples of the same aquatic system. Sets of three to five PSDs were deployed in the Portland Harbor Superfund site for three sampling periods over the course of two years. The PSD filters were extracted and, as a composite sample, analyzed for 33 polycyclic aromatic hydrocarbon compounds. The between-sample and within-sample variances were calculated to characterize sources of variability in the environment and sampling methodology. A method for calculating a statistically reliable and defensible confidence interval for the mean of a single aquatic passive sampler observation (i.e., n = 1) using an estimate of sample variance derived from a pilot study is presented. Coverage probabilities are explored over a range of variance values using a Monte Carlo simulation.

journal_name

Environ Toxicol Chem

authors

Matzke MM,Allan SE,Anderson KA,Waters KM

doi

10.1002/etc.2014

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

2888-92

issue

12

eissn

0730-7268

issn

1552-8618

journal_volume

31

pub_type

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