As part of the geochemistry programme, a wide range of elements and compounds are measured in three environmental media: topsoil, stream water and stream sediment. Other samples collected but not routinely analysed include subsoil, vegetation and panned concentrate samples – these are available from the GSI archive on request.
Shallow Soil
1. Sampling
- Composite sample from points and centre of 20 m x 20 m square
- Collection by hand auger to 20 cm and 50 cm depths
2. Preparation
- Drying
- Disaggregation
- Milling to fine powder pulp
4. Data Processing
- Quality control
- Statistical analysis
- Mapping
- Interpretation
Stream Sediments
1. Sampling
- In-situ wet sieving technique from small streams
- Collection of <150 µm fraction
2. Preparation
- Drying
- Disaggregation
4. Data processing
- Quality control
- Statistical analysis
- Mapping
- Interpretation
Stream Waters
1. Sampling
- Collection of filtered water, <0.45µm
2. Preparation
- Acidification
4. Data Processing
- Quality control
- Statistical analysis
- Mapping
- Interpretation
