Journal
ENVIRONMENTAL POLLUTION
Volume 157, Issue 7, Pages 2043-2052Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.02.028
Keywords
Probability sampling; Design-based sampling strategy; Background values; Stratification; Validity
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To determine background values of the 252 chemical compounds listed in Dutch legislation, a survey was designed with the aim of estimating percentiles of the cumulative frequency distributions and areal fractions exceeding the former, legislative reference values. Sampling locations were selected by probability sampling, so that in estimating the target quantities no model assumptions on the spatial variation were required, and valid estimates could be obtained by design-based inference. Strata in random sampling were formed by overlaying an aggregated soil map and land use map. For most of the heavy metals the areal fraction with concentrations in the topsoil (0-10 cm) exceeding the reference value was smaller than the allowable maximum of 5%. For these compounds a background value was determined smaller than the reference value. Exceptions were V, Co, Ba and Cu, for which a background value was defined (slightly) larger than the reference value. (C) 2009 Elsevier Ltd. All rights reserved.
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