Environmental Fate Testing — OECD TG 106 Adsorption/Desorption (Batch Equilibrium)

Decoding Soil Interaction: Quantifying Mobility and Environmental Partitioning

The interaction between chemical substances and soil or sediment matrices is a decisive factor in predicting environmental persistence and groundwater contamination risk. Weshin provides high-precision OECD TG 106 Adsorption/Desorption services using the Batch Equilibrium Method, delivering the essential $K_d$ and $K_{oc}$ values required for global regulatory dossiers (e.g., EU REACH, EPA, and Agrochemical Registrations).
 

Our Technical Excellence

• Standardized Batch Methodology: Utilizing state-of-the-art shaking and centrifugation protocols to establish accurate thermodynamic equilibrium between aqueous and solid phases.

• Diverse Soil Portfolio: We utilize a range of characterized soils with varying pH levels, texture, and organic carbon content to simulate diverse environmental conditions globally.

• Multi-Tiered Testing Strategy:

  • Tier 1: Screening Test for rapid assessment of adsorption potential.

  • Tier 2: Kinetic Study to determine the precise time required to reach equilibrium.

  • Tier 3: Adsorption Isotherms for the calculation of Freundlich adsorption coefficients ($K_f$) and intensity factors ($1/n$).

• Advanced Trace Analysis: Leveraging LC-MS/MS and GC-MS/MS platforms to ensure high sensitivity and robust mass balance, even for substances with extreme adsorption characteristics.

• Comprehensive Desorption Analysis: Investigating the reversibility of the adsorption process to evaluate the potential for long-term leaching and bioaccessibility.
   

Application Scope

Indispensable for agrochemicals (Active Ingredients), pharmaceuticals, and industrial chemicals. This data is critical for Environmental Risk Assessment (ERA), Groundwater Modeling, and Safety Data Sheet (SDS) preparation.


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