Understanding SPE Retention Mechanisms

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.  Some of my preparation procedures are simply daunting – a series of challenging, time-consuming steps with multiple opportunities for error or cross-contamination.  On top of that is the multitude of parameters that must be selected.  Questions such as “what should the pH be?”, “which solvents should I use?” and “what should my sample volume be?” are a few of the many, many parameters that must be optimized.  When you look at all the opportunities for something to go wrong, sample preparation can seem very overwhelming.  While powerful, sample preparation becomes a lot less complicated when you understand the science behind what you’re trying to accomplish with this step.

Continue reading Understanding SPE Retention Mechanisms

What does a thermistor do anyway?

It is easier to understand something when you know what the actual word means.  Thermistor is a portmanteau (yes, sometimes I do pay attention to linguistics) of the words thermal and resistor.  This means that when a thermistor is heated, its resistance is either increased or decreased based on the properties of that particular thermistor.  This property makes it very useful for many different applications all over the world.  But thermistors are most useful, at least from my perspective, when they’re used in automated solid phase extraction systems.

Continue reading What does a thermistor do anyway?

Extraction of Polyphenols in Tea with Lemon Juice

For thousands of years, tea has been one of the most popular drinks around the world. Not only is tea delicious, it is also full of health benefits. Tea is an abundant source of antioxidants called polyphenols. One of these polyphenolic compounds, catechins, are found mostly in green tea. Catechins have been studied thoroughly and have been found to reduce free radical stress, they have also been found to be anti-inflammatory as well as potentially therapeutic for cancer cells.

Continue reading Extraction of Polyphenols in Tea with Lemon Juice

The Chemistry of SPE

New year – fresh start

If you’re like me, you start the new year off with a list of resolutions for the coming months – resolutions to be more fit or to secure a promotion at work or to reduce your carbon footprint. Whether you’re trying to improve your health or further your career, these are the types of goals that I like to refer to as getting “back to basics” because they require you to start with a solid foundation which you can build on to achieve success.

Continue reading The Chemistry of SPE

Christmas Trivia

Happy Tuesday and Merry Christmas to those who celebrate this holiday! If you’re anything like me, you started singing Christmas carols and getting out your lights the day after Halloween. And if you’re like me, you view Thanksgiving as the “halfway to Christmas” holiday. These days, it seems like Christmas gets recognized for nearly 3 months out of the year, but I enjoy every minute of it. To me, it’s a wonderful time of the year – the holly, ornaments, carols, cookies, wreaths, lights and garlands – I can’t get enough.

Continue reading Christmas Trivia

Naphthalene – Are You Ingesting More Than You Realize?

How familiar are you with naphthalene?

If you have ever used mothballs for storing clothing, you are pretty familiar with a compound known as naphthalene. If you are asking questions like “how would I know if I’ve used mothballs?” or “remind me, what do mothballs look like?” then you’ve never spent any significant time around them. If you had, you would vividly remember the smell that hits you like a brick and brings you to your knees.

Continue reading Naphthalene – Are You Ingesting More Than You Realize?

Is the Ocean Floor Dissolving?

Since oceans cover roughly two thirds of the Earth, and since oceans can demonstrate signs of ecosystem health and climate change, the U.S. EPA has watched the ocean for changes in their physical property for many years. From sea level height to ocean temperature to coastal flooding occurrences to surface temperature, the EPA has closely monitored changes in these properties as an indicator of climate change.

Continue reading Is the Ocean Floor Dissolving?

Tuesday Trivia – December 11, 2018

Happy Tuesday! The final question for 2018 focuses on the EPA 500 Series methods that have been developed to quantify organic contaminants in drinking water. For those unfamiliar, EPA Method 525.2 outlines the extraction and quantification of organic compounds in drinking water. The EPA eventually revised the method and released Method 525.3. The updated revision incorporates a number of changes to improve the extraction and quantification of drinking water contaminants. Continue reading Tuesday Trivia – December 11, 2018