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Field Sampling Considerations A Laboratory Perspective Joe Shaulys Sr. Account Executive. Agenda. Definitions Test Method Selection Ordering Containers Chain of Custody Temperature Cooler Packing Hold-times What Happens at the Lab Upon Sample Receipt Questions. Definition of Terms.
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A Laboratory Perspective
Sr. Account Executive
Test Method Selection
Chain of Custody
What Happens at the Lab Upon Sample Receipt
Hold time – the elapsed time from sample collection by field personnel until its processing/analysis by lab personnel.
Holding time requirements are dictated by the method.
Checks for VOC contamination originating from site conditions and sample shipment transport.
Field Blank - contaminant-free “sample” transferred from one container to another at the site with appropriate preservative added.
Checks reagent and environmental site contamination.Definition of Terms
Duplicate Samples - two separate samples taken from the same source and analyzed independently.
Evaluates precision of measurements throughout the analytical process.
Matrix – the predominant material that comprises a sample, for example sludge.
Matrix is not synonymous with phase (liquid or solid).
Data confidence requirements - qualitative and quantitative
Time and cost
Clean Air Act (CAA)
Clean Water Act (CWA)
Safe Drinking Water Act (SDWA)
Resource Conservation and Recovery Act (RCRA)
Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA)
Superfund Amendments Reauthorization Act (SARA)
Same Analysis – Different Method – Different Compound Lists
Order by project, based on project description
Number and types of containers
Volume(s) of samples
Determine how and when to deliver
Review all requirements with Project Manager
Preservatives and hold times
Try to avoid over ordering.
Bottles cannot be reused and preservatives have a shelf life
Vial containing headspace - Avoid this!
Using the plastic coring device, collect 5 grams of sample into a 40ml vial containing sodium bisulfate or DI water and a stir bar
All samples must be collected in duplicate
An additional 5 gram aliquot must be put in a 40ml vial containing 5 ml methanol (high concentration)
An additional 100 gram jar unpreserved is collected for %moisture
The lab will reweigh the pre-tared containers to calculate the actual sample weight
Holding time is 14 days from collection for Bisulfate-preserved samples
Samples collected with DI water vials must be received at the lab for analysis or freezing within 48 hrs of collection
Field Collection Options 1
At minimum, 2 Encore samplers for direct collection of material for low level and 1 encore for high level analysis = 3 Encores
An additional 2 oz soil jar for %moisture and screening
Samples must be put in preservative within 48hr of collection
Easy in the field- no weighing, no preservation
Expensive for collection
Sample temperature must be kept within the required temperature range of 4C +/- 2C as per regulatory agency mandates to preserve sample integrity.