Sample techniques and preservation Flashcards
Two strategies practice for preservation of living species
- In-situ-
- Ex-situ
The process of protecting an endangered plant or animal in its natural habitat
In-situ-
The process of collecting specimens or data in the wild
In-situ
The relocation of endangered or rare species from their natural habitat to protected areas
Ex-situ-
Collection of samples in the wild for its analysis in the laborary
Ex-Situ-
Importance of sample preservation
- If not cared for properly, important information may be destroyed
Soil preservation, containers, handling and storage
- Chemical preservation of solid is not generally recommended
- Samples should be cooled and protected from sunlight
Primary potential problems associated with soil sampling
- Cross contamination
- Improper sample collection
Decontamination of sampling equipmen is necessary
Cross contamination
Using contaminated equipment, disturbance of the matrix, resulting in variable, non-representative results
Improper sample collection
Sample collection for soil
- Surfance soil samples collection
- Sampling at depth with Augers and thin wall tube samplers
- Sampling with triers
- Test pit / Trench excavation
Sample bottle preservatives and holding times for soil and sedimet samples
- Metals
- Organic Parameters
Sample collection for water
- Sampling for biological contaminants
Holding time for water
8 hours for source water
30 hours for drinking water
48 hours for coliphage samples
Common sampling methods for laboratory analysis include
- grab sample
- Composite sample
