Why move to Manual or Automated Solid Phase Extraction?

If you are tired of shaking liquid-liquid extractions (LLE) and want to move onto a technique that is less labor-intensive, solid phase extraction (SPE) may be your answer!    There are manual as well as automated options available for solid phase extraction.  It may seem like more work for your lab to move to a different technique, but what you gain in time savings may be worth it to you in the end.

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Are Your Proficiency Testing Results Failing for EPA Method 1664 with SPE?

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). If you are not familiar with proficiency testing, it is a sample purchased from an approved vendor to evaluate the ability of a lab to meet the acceptance criteria of the method.  If the labs’ results are out of the PT samples acceptance criteria, they can redo the testing.

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Tackling Emulsions Just Got Easier

Believe it or not, we’re all familiar with emulsions.  Have you ever added food oil to a pot of water while cooking?  That’s an emulsion.  Do you put dressing on your salad?  It should be called salad emulsion – although, that may not have the same edible appeal.  Do you drink milk?  Emulsion.  What about milk?  Butter?  Eggs?  All emulsions.

If we’re referring to emulsions in the laboratory, the examples are different, but the chemistry involved is very similar – as are the mechanisms for breaking them. Continue reading Tackling Emulsions Just Got Easier

SLE, SPE and LLE – How are Those Different?

Liquid-liquid extraction (LLE), supported liquid extraction (SLE), and solid-phase extraction (SPE) have existed for decades and if you’re doing organic sample preparation, you’re probably quite familiar with at least one of these techniques.  But are you familiar with all of them?  How are they similar?  How are they different?  Let’s review! Continue reading SLE, SPE and LLE – How are Those Different?

Better Water Testing for Safer Produce

“Do what you can, with what you have, where you are.”
-Theodore Roosevelt

As the seasons change, I’m reminded of this quote and its significance to the air, land and water that sustain us.  As the weather gets warmer and winter transitions into spring, I love listening to the sound of birds chirping in the morning and watching new flowers blossom.  I look forward to the coming weeks and months of picking strawberries, raspberries, cucumbers and a myriad of other fresh fruits and vegetables.  There’s nothing like the feel of the warm sun and a gentle breeze as you pluck a fresh apple from a tree and bite into it.

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1,4 Dioxane Contamination and Updated Regulations – Are You Being Impacted?

In a never-ending list of chemical pollutants, a compound that is gaining a lot of attention is 1,4-dioxane.  In fact, New Jersey just became the first state to set regulations on the quantity of 1,4-dioxane that can be present in drinking water.

1,4-dioxane, commonly called dioxane (the other two isomers – 1,2-dioxane and 1,3-dioxane are rarely ever seen), is an ether with the molecular formula of C4H8O2.  Dioxane was previously used as a polar aprotic solvent.  For those who remember their organic chemistry from college, SN2 reactions involve the use of polar aprotic solvents.  Since its original use in laboratories, dioxane has been determined to be carcinogenic and, unlike many organic pollutants, it is completely soluble in water.  Dioxane’s use as a solvent for industrial purposes has been mostly replaced with tetrahydrofuran, which has a higher boiling point and a lower toxicity.  However, the story does not end there!  

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Solid Phase Extraction – Perceptions and Misconceptions

I was at a tradeshow the other day and overheard a conversation that stayed with me. The conversation was taking place between two colleagues who were reminiscing about their days in the college chemistry lab.

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