Analytical Replication Improves Precision but Does Not Create Environmental Replication: Hierarchical Uncertainty and Decision Stability in Metal(loid) Soil Exposure Screening — Data and Reproducibility Materials

<p dir="ltr">This repository contains the final data, R code, derived datasets, publication-facing figures and supplementary tables, spatial sampling information, and quality-assurance records supporting the associated <i>Toxics</i> manuscript <b>“Analytical Replication Improves Precision but Does Not Create Environmental Replication: Hierarchical Uncertainty and Decision Stability in Metal(loid) Soil Exposure Screening.”</b></p><p dir="ltr">The study evaluates the consequences of analytical replication and inferential-unit choice in a hierarchical topsoil dataset from Leicester and Leicestershire, United Kingdom.

The sampling and analytical hierarchy comprises <b>850 field increments, 26 independent site-level environmental composites, 52 physical laboratory samples, and 102 analytical determinations</b> for As, Be, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, V and Zn.</p><p dir="ltr">The repository corresponds to the final <b>Pb-corrected, singleton-safe POST-v1.4 analytical state</b> used for the revised manuscript. It includes the reproducible correction of 16 Pb records from ICP-MS Run 2, validated handling of the Brocks Hill singleton analytical records in the R1–R4 Monte Carlo workflow, final variance-component and reproducibility outputs, effect sizes and 95% confidence intervals for urban–rural comparisons, screening-level exposure and toxicity calculations, and the final manuscript and supplementary figures and tables.</p><p dir="ltr">Spatial materials include the cleaned field-sampling dataset for all <b>850 original topsoil increments</b>, site-level coordinates, documented park/reserve areas, and quantitative characterisation of the horizontal field-sampling footprint.