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      The Problem of PFAS: Part 2 - Top Regulations

      June 3, 2021 at 3:00 AM / by David Gallagher posted in SPE solid phase extraction, Sample preparation, EPA Method 537.1, per- and polyfluoroalkyl substances, PFAS, Drinking water, EPA Method, water extractions, SPE, perfluorinated compounds, PFOS, extraction, ISOLUTE 101

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      Welcome back! As the title indicates, this is Part 2 of an ongoing series where we discuss what’s going on with PFAS. For those of you who may not have read Part 1, you missed out on a summary of the controversy surrounding this group of compounds and I would recommend going back and taking a quick read through it to make sure that you’re caught up. 

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      Why Concentrate Down to 1 mL End Point? Can you go down to 0.5 mL?

      April 29, 2021 at 3:00 PM / by Michael Ebitson posted in SPE solid phase extraction, Sample preparation, tech tips, EPA Method, Drying, application, evaporation systems, lower volume samples

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      When working with regulated environmental methods have you ever asked yourself why are all these extracts concentrated down to one milliliter (mL) final volume? This is true for most soil and aqueous methods. Of course, a few methods will require a more diluted final volume but not many.

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      Common Mistakes by the Lab Series: The Pain of Contaminated Squeeze Bottles

      December 16, 2020 at 9:42 AM / by Deanna Bissonnette posted in Sample preparation, Solid-phase extraction, SPE, phthalates

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      Ugh…I think we can all agree that the worst thing that can happen when testing high profile samples is losing an extract due to phthalate contamination. Whether you are extracting 525.2 or 625.1 samples, phthalates can ruin your day and wreak great havoc, causing false positives!

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      How to plan for dirty samples for both extraction and analysis

      December 16, 2020 at 9:39 AM / by Matt Harden posted in Sample preparation, Solid-phase extraction, wastewater, gas chromatography, SPE, dirty samples

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      When juggling the responsibilities of working in a sample preparation lab as well as working as an analyst, it is very easy to get caught up in a never-ending cycle of samples. There is no situation “more frustrating” then when you have a bunch of wastewater samples that need to be extracted and analyzed ASAP and there is that one sample that is so much more challenging to extract than the others.

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      Simplifying Water Extractions with SPE – One Matrix, One Method Extraction

      December 15, 2020 at 1:09 PM / by Deanna Bissonnette posted in Sample preparation, Solid-phase extraction, water extractions

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      Have you ever thought to yourself I wish there was one way to effectively extract all of our aqueous samples? For instance, there are several methods available to extract aqueous samples, such as extraction method 3510 liquid-liquid extraction (LLE), method 3520 continuous liquid-liquid extraction (CLLE), and method 3535 solid-phase extraction (SPE). Wouldn’t it be more convenient to use one extraction method within the lab for most if not all of your aqueous extractions?

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      How does your sample prep change for LC/MS vs GC/MS

      December 15, 2020 at 11:02 AM / by Deanna Bissonnette posted in LC-MS, GC-MS, Sample preparation, drying extracts, drydisk, gas chromatography, liquid chromatography

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      When preparing your extracts for analysis, it is important to know which instrument to use and why you should be using that specific one. Of course, we know that each EPA method dictates which analysis instrument must be used within each method, however, we will be determining why that option was chosen in the first place in this blog post!

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      Do Flow Rates Matter in SPE?

      December 2, 2020 at 5:32 PM / by Deanna Bissonnette posted in SPE solid phase extraction, Sample preparation, Drinking water, flow rates, C18 Disks

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      Have you ever wondered why solution flow rates are so important when performing sample preparation with solid phase extraction (SPE)?  If you have, read on – I have the answer for you!

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      Understanding SPE Retention Mechanisms

      December 1, 2020 at 2:05 PM / by Maura Rury posted in SPE solid phase extraction, Sample preparation, Sorbent, application

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      As a chemist, I’ve constantly stressed the importance of proper sample preparation. Whether I’m diluting, digesting, preconcentrating, extracting, or performing a combination of these, sample preparation is the key to making my analysis a success, yet it’s often the most challenging part of my workflow.

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