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      An Alternative To n-Hexane For Doing Oil and Grease Extractions

      December 17, 2020 at 1:45 PM / by Andrew Taylor posted in SPE solid phase extraction, application, oil and grease, n-hexane

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      Volatile. Flammable. Skin irritant. Respiratory irritant. Possibly fatal if swallowed. For those of you processing samples according to EPA Method 1664B, you’ve seen these hazard descriptions before – on the safety data sheet (SDS) for n-hexane. For those of you who aren’t familiar with (or have forgotten about) the hazards related to n-hexane, those are just a few. It also smells unpleasant and could explode if heated. It’s a relatively unpleasant organic solvent to work with and it begs the question:

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      Myth Busters: Smaller Sample Volumes - EPA Method 1664B

      December 16, 2020 at 9:22 AM / by Michael Ebitson posted in oil and grease, wastewater, epa method 1664b

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      Have you ever had days of extracting oil and grease samples and thought to yourself “there must be an easier way to work with wastewater samples”? Whether you run oil and grease samples by liquid-liquid extraction (LLE) or by solid-phase extraction (SPE) it can be challenging at times to efficiently extract 1-liter samples due to the sample matrix.

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      Automated SPE and FT-IR Detection – Expanded Detection Possibilities

      December 14, 2020 at 3:08 PM / by Staffan Bergstrom posted in oil and grease, ir technology, ASTM D7066-04, ASTM D7678-17, TPH, total petroleum hydrocarbons

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      IR technology is a rapid and convenient tool for both qualitative and quantitative analysis that has been around for over a century. Traditional IR spectroscopy relies on vibration energies from the molecular bindings, where IR emission is absorbed by the bond when it has the same frequency as the specific vibration or movement as the bond.

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      Are Your Proficiency Testing Results Failing for Method 1664?

      December 14, 2020 at 3:01 PM / by Michael Ebitson posted in SPE solid phase extraction, LLE liquid-liquid extraction, tech tips, oil and grease, epa method 1664b, proficiency testing

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      It is that time of year again when laboratories are fulfilling accreditation requirements for the methods that they offer. One of the requirements that must be met for each method is called proficiency testing (PT).

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      Tips for Improving Your Oil & Grease Recoveries

      December 10, 2020 at 2:36 PM / by Maura Rury posted in application, oil and grease, epa method 1664b, n-hexane

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      On the surface, EPA Method 1664B seems pretty straightforward – use n-hexane to extract compounds (commonly referred to as “oil and grease”) from an acidified water sample. Evaporate the hexane from the extract, weigh the residue that gets left behind, and report that weight in terms of a concentration (often as mg/L of HEM).

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      Reducing the Headache of Challenging Emulsions

      December 4, 2020 at 1:55 PM / by Andrew Taylor posted in SPE solid phase extraction, emulsions, application, oil and grease, HEM, epa method 1664b

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      Have you ever opened a jar of olives and noticed the shimmering liquid floating on the surface? Believe it or not, that liquid is actually residual oil that is given off by the olives themselves.

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      The Secret to Tackling Dirty Samples

      December 3, 2020 at 2:37 PM / by Maura Rury posted in Solid-phase extraction, tech tips, spe disk, oil and grease, wastewater, prefilters

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      Solid phase extraction is a powerful technique – it can be used to clean up the most challenging samples, and extract and preconcentrate hundreds of semivolatile organic compounds.

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      The Importance of Methanol in Oil & Grease Extractions

      December 1, 2020 at 3:57 PM / by Maura Rury posted in SPE solid phase extraction, oil and grease, HEM

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      Have you ever been extracting samples for oil and grease compounds using solid phase extraction (SPE) and thought, “why do I have to use all these different solvents, when I’m just trying to get my compounds to retain on, and then elute from, an SPE disk?”

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