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    RE: No-purge sampling references

    Posted in: Groundwater Forum

    Very good continued discussion. Passive methods are not ALL "bias free" so don't be too broad, Andy. Many of them show parity, but not all of them. Demonstrating accuracy is still important for any method. Why would wells yield the same results...

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    RE: No-purge sampling references

    Posted in: Groundwater Forum

    You should take a look at "Passive Diffusion Bags" and "HydraSleeves". Both of these sampling methods allow you to collect samples which have shown to have comparable analyticals. Just do a web search for either of the above and you'll find the information...

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    RE: No-purge sampling references

    Posted in: Groundwater Forum

    Go to NGWA's website and search passive diffusion bags (PDBs). There are confirmation studies. I disagree that all methods produce bias. The accepted methods in the industry are used because no statistically significant bias (regarding the specified...

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    RE: No-purge sampling references

    Posted in: Groundwater Forum

    Have a look at Sandy Britt's Snap-Sampler web site. Sandy has done a good job of technically justifying the products he promotes. http://www.snapsampler.com/Technical-Information-and-Case-Studies (disclaimer - not an endorsement) Working...

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