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      The Importance of Air-Drying Sorbent in Preparation for GC Analyzed Extracts

      January 13, 2022 at 9:00 AM / by Deanna Bissonnette posted in SPE solid phase extraction, Sorbent, tech tips, Drying, gas chromatography

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      When you are extracting SVOCs from aqueous samples and analyzing via Gas Chromatography (GC), every step within a solid phase extraction (SPE) procedure is imperative, but one of the most important steps that must be done properly is the air-dry step post sample loading.

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      Hexachloroethane: Too Hot to Touch?

      December 16, 2021 at 2:00 PM / by Matt Harden posted in wastewater, TurboVap, concentration, Hexachloroethane, heat block, water bath

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      Testing for toxic organic contaminants in environmental samples often requires the following three sample preparation steps: 1) Extraction, 2) Concentration, and 3) Analysis. The goal during these three steps is to isolate the contaminants from the sample matrix and concentrate them so they can be detected and quantified. In this blog, I will discuss the importance of understanding how different types of concentration equipment can impact your analyte recoveries and the overall performance of your extraction procedure.

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      Why is EPA Method 549.2 a Challenging Method?

      November 11, 2021 at 8:00 AM / by Deanna Bissonnette posted in Drinking water, diquat, paraquat, epa 549.2

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      When I first saw EPA Method 549.2 only had two compounds, I said to myself: “WOW! That’s a breeze! Only two compounds to worry about, so it can’t be that difficult to extract!” Seeing as I was used to the methods with 100+ compounds to worry about, naturally, I would believe this at first glance. However, I was severely mistaken…these two compounds are far from easy to recover from a water sample. To be successful with EPA Method 549.2, you need to make sure you have the right chemistries taking place in order to recover these compounds well or even at all.

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      How to Reduce Sample Volumes without Sacrificing Analytical Detection Limits

      October 21, 2021 at 2:00 PM / by Deanna Bissonnette posted in biotage horizon 5000, oil and grease, wastewater, epa method 1664b, Biotage Horizon 3100, hexane extractable materials, EPA, reduced volume

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      In the world of environmental testing, many labs encounter extremely dirty samples. For example, EPA Method 1664B is the protocol for extracting oil and grease from wastewater samples. More often than not, these types of samples are really dirty, requiring loads of pre-filters, glass wool, and filter aid in order to get the entire liter of water through the disk. Well, there is!

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      The Problem of PFAS: Part 3 - Which PFAS Method is Right for Me?

      September 22, 2021 at 3:55 PM / by Matt Harden posted in EPA Method 537.1, PFAS, EPA Method 533, PFOA, ISO

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      Welcome to part 3 of our blog series “The Problem of PFAS”. If you are just tuning in, you might want to take a look at the previous blogs of this series as we provided background on the PFAS controversy (Part 1) as well as a review of the regulatory guidelines for monitoring PFAS contamination in the environment (Part 2).  If you are up to speed on this series, you are now ready to dive deeper into the specific methods for monitoring PFAS in the environment.

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      Contaminants in your lab? What you should look for.

      July 21, 2021 at 8:15 PM / by Stephen Panos posted in SPE solid phase extraction, EPA Method 537.1, epa method 525.2

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      If you are processing environmental samples then you’ve probably dealt with contamination at some point. If you haven’t, then you should be congratulated for creating the only laboratory on Earth that has ever been completely free of all sources of contamination!

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      Performance vs. Prescriptive Based EPA Methodology

      June 17, 2021 at 2:00 PM / by Deanna Bissonnette posted in SPE solid phase extraction, perscriptive, performance, EPA

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      I am willing to bet there have been a few people reading this that early in their careers have had a moment of “what does that mean” when learning new procedures and or methods. You are about to learn mine. When I was onboarding and learning new standard operating procedures and methods one really stood out and still does to this day. It was when I was first exposed to EPA method 1664B. It stated right in the introduction it is a performance-based method. I thought to myself what does a performance-based method consist of and how do all labs qualify to run it?

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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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      What to know when transitioning from EPA method 525.2 to 525.3

      May 20, 2021 at 9:00 AM / by Michael Ebitson posted in SPE solid phase extraction, Drinking water, epa method 525.2, epa method 525.3

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      When learning that you may be transitioning to a newer revision of an EPA method some thoughts may come to mind such as: it took so long to perfect this sample preparation method, or I hope they have some improvements and or greater flexibility allowances in this revision. Well, that is exactly what we will touch upon in this blog post - sample preparation improvements.

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      The Problem of PFAS – Background

      May 4, 2021 at 10:17 AM / by David Gallagher posted in PFAS

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      If you’ve been in the environmental arena as long as I have, seeing a “chemistry” term on the nightly news in conjunction with pollution is usually nothing to worry too much about. Sure, it’s an indicator that something bad has happened locally, but usually the news is a bit more…wild, than it needs to be and everything turns out just fine. After all, sensationalism is what gets the viewers!

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