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Related Experiment Videos

Mapping heavy metals in polluted soil by disjunctive kriging.

B von Steiger1, R Webster, R Schulin

  • 1ETH Zürich, Institut für terrestrische Okologie, Grabenstrasse 3, 8952 Schlieren, Switzerland.

Environmental Pollution (Barking, Essex : 1987)
|January 1, 1996
PubMed
Summary

Soil heavy metal contamination in Weinfelden, Switzerland, was mapped before incinerator construction. Lead and copper exceedance probabilities were identified, guiding local planning decisions for environmental protection.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Spatial Analysis

Background:

  • Heavy metal soil contamination poses environmental risks.
  • Pre-incinerator construction soil analysis is crucial for land-use planning.
  • Swiss federal guidelines set maximum tolerable heavy metal concentrations.

Purpose of the Study:

  • To estimate and map heavy metal concentrations in Weinfelden's soil.
  • To assess the probability of exceeding Swiss federal heavy metal guidelines.
  • To inform local planners about potential environmental risks.

Main Methods:

  • Soil sampling across a 50 km² area.
  • Heavy metal concentration analysis (lead, copper, cadmium, zinc).
  • Disjunctive kriging for probabilistic mapping of exceedances.

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Main Results:

  • Lead concentrations exceeded guidelines in several locations, with widespread moderate exceedance probabilities.
  • Copper exceeded guidelines in vineyards and orchards, with non-negligible exceedance probabilities elsewhere.
  • Cadmium and zinc concentrations were generally below guidelines; metal distribution patterns suggest common sources.

Conclusions:

  • Lead and copper pose localized and widespread risks, respectively, requiring careful planning.
  • Spatial analysis and probabilistic mapping are effective tools for environmental risk assessment.
  • Understanding heavy metal sources is key for effective environmental management strategies.