WHAT THE EVIDENCE SAYS
Dalu and colleagues measured 26 elements at 21 sediment stations. Several high chromium and nickel concentrations aligned with natural mineral signals; comparison benchmarks dramatically changed calculated pollution indices. The paper explicitly distinguishes screening thresholds from demonstrated ecological harm.
WHY IT MATTERS / OUR READ
A red number on a contamination dashboard is a prompt to investigate sources, speciation, exposure and ecological effects—not a self-validating diagnosis. The counter-signal cuts both ways: natural geology can confound anthropogenic attribution, while measured hazards still warrant attention.
CAVEATS / UNCERTAINTY
One-season sampling cannot conclusively partition all sources or quantify real health outcomes; lithogenic interpretation does not rule out diffuse human contamination.
SOURCE
Environmental Geochemistry and Health — Dalu et al. (26 Oct 2026)
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