Sample Types. GrabCompositeIntegratedContinuous. Grab Sample. A discrete sample that is taken at a specific point and timeExamples?. Composite Samples. A series of grab samples, usually collected at different times and lumped together, are considered composite samplesExamples?. Two Types
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
1. Sample Type
2. Sample Types Grab
3. Grab Sample A discrete sample that is taken at a specific point and time
4. Composite Samples A series of grab samples, usually collected at different times and lumped together, are considered composite samples
5. Two Types of Composite Samples Time-weighted Composite – a fixed volume of sample is collected at prescribed time intervals in either a large composite bottle or separate bottles for compositing later.
Flow-weighted Composite – a sample is taken after a specified volume of flow has passed the monitoring station.
6. Integrated Samples A grab sample that accounts for horizontal or vertical variation, but is still a snap-shot in time.
Equal Width Increment (EWI) – this is what it sounds like.
Equal Discharge Increment (EDI) – must know flow characteristics of the cross section of the stream . Subsections of the cross section can be sampled to account for flow-induced variability.
7. Integrated Samples For standing water or wells:
Depth Integrated Sample – can be achieved by sampling each lake strata. The objective is to obtain a representative sample of the entire water column.
8. Continuous Samples Obtained with automated samplers to assess variables measured using electrometric methods.