Environmental cadmium in Europe.

Area of Science:

• Environmental Chemistry
• Ecotoxicology
• Environmental Science

Background:

• Cadmium (Cd) is a toxic heavy metal with significant environmental and health implications.
• Understanding cadmium's environmental fate, exposure pathways, and ecotoxicological effects is crucial for risk assessment and management.

Purpose of the Study:

• To review recent (10-year) information on cadmium's environmental fate, exposure, and ecotoxicological effects.
• To assess human and environmental exposure pathways, with a focus on European countries.
• To analyze emission balances and consumption trends of cadmium.

Main Methods:

• Literature review of studies from the past 10 years.
• Analysis of environmental data for cadmium in air, water, soil, and sediments.
• Examination of ecotoxicological data and food web dynamics.
• Review of regulatory limit values and emission data within the European Community.

Main Results:

• Cadmium waste disposal is predominantly in solid waste deposits (70-90%).
• Consumption patterns are shifting due to regulations, with decreased use in plating, stabilizers, and pigments, but increased use in batteries.
• Cadmium mobility in sediments is higher than previously thought; aquatic organism accumulation varies (algae > molluscs > crustaceans > fish).
• No biomagnification of cadmium observed in aquatic or terrestrial food webs.
• Plant uptake is species-specific, with concentrations decreasing from roots to seeds.
• Downward trends in air concentrations and deposition rates observed in Northern Europe (1970s-mid-1980s).
• Dissolved cadmium in rivers is low (10-500 ng/L); oceanic seawater concentrations are 0.5-10 ng/L, with higher levels in coastal areas.
• Freshwater lake sediments show elevated cadmium (3-30x background), with recent decreases in pollution.
• Marine sediments show enrichment factors of 2, locally up to 5-10.

Conclusions:

• Despite regulatory efforts, cadmium consumption, particularly in batteries, is increasing globally.
• Cadmium poses risks to aquatic and terrestrial ecosystems, with varying accumulation and mobility patterns.
• Continued monitoring and management strategies are essential to mitigate cadmium pollution and exposure.