Water samples: Collection: Use clean, sterile containers to avoid contamination. Collect samples at the appropriate depth and location, ensuring proper mixing before filling the container. Preservation: Preserve some samples with appropriate chemicals (e.g., acids for trace metal analysis) and Environment Testing lab store others without preservation for specific parameters (e.g., dissolved oxygen). Keep samples cold or frozen if necessary. Sediment samples: Collection: Collect sediments using clean equipment, avoiding contamination from the surface layer.

Soil samples: Collection: Use clean tools to collect representative soil samples from various depths. Avoid touching the soil directly with hands to prevent contamination. Preservation: Store soil samples in airtight containers to prevent drying or moisture loss. Refrigeration or freezing may be required for some analyses. Air samples: Collection: Use specific air sampling devices suited to the intended analysis (e.g., pumps with filters for particulate matter, sorbent tubes for volatile compounds). Preservation: Some air samples may not require preservation, but others might need refrigeration or freezing depending on the analysis.

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