Topic: Ground-Water Sample Pretreatment – Filtration and Preservation

Ground-water sample chemistry, by nature, will change within seconds as samples are brought from in-situ conditions (within the ground-water system, where it is at higher pressure and stable pH and temperature relative to atmospheric conditions) to the surface.  When these changes occur, the representative nature of the sample is compromised.  This series of 2 modules discusses in detail the sample pretreatment methods, including sample filtration and preservation, that must be implemented in the field at the time of sample collection (not later, in the laboratory) to protect the physical and chemical integrity of the samples from the time the sample container is filled to the time it is extracted or analyzed in the laboratory.  Upon completing these modules, you will know how to recognize and avoid several significant but common sources of error associated with field filtration and preservation of ground-water samples.  Field videos are included within each module to explain the practices and procedures used in filtration and preservation of ground-water samples.  While you may opt to take just one of these modules, it is strongly recommended that you take both modules in the prescribed order if you want comprehensive coverage of the subject.

Module GWM–26 (Total Length: 51 minutes) Price: $159.00 Sign in to Your E-School Account to Register

Ground-Water Sample Filtration

• Field Filtration of Ground-Water Samples
  • Objectives and Purposes of Sample Filtration
  • Naturally Occurring vs. Artifactual  Turbidity in Samples
  • Filtration Methods Available for Ground-Water Samples
  • Discussion of ASTM Standard D 6564 on Field Filtration of Ground-Water Samples
  • Which Parameters Should and Which Should Not be Filtered
  • Filter Preconditioning – What it is, Why and How it Should be Done

Total CEUs for Module GWM-26: 1.0 CEU

Module GWM–27 (Total Length: 40 minutes) Price: $159.00 Sign in to Your E-School Account to Register

Ground-Water Sample Preservation

• Physical and Chemical Preservation of Ground-Water Samples
  • Objectives and Purposes of Sample Preservation
  • Physical Sample Preservation – Things You Never Thought of as Sample Preservation
  • Chemical Preservation of Samples – When, Where and How it Should be Done
  • Overview of ASTM Standard D 6517 on Field Preservation of Ground-Water Samples
  • Elements of QA/QC for preservation of samples

Total CEUs for Module GWM-27: 1.0 CEU