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 … Continue reading Are Your Proficiency Testing Results Failing for EPA Method 1664 with SPE?
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!
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! Throughout my college career, the phrase “like dissolves like” was referred to quite frequently. This phrase was particularly relevant when we did solubility … Continue reading Do Flow Rates Matter in SPE?
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 … Continue reading Understanding SPE Retention Mechanisms
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 … Continue reading The Chemistry of SPE
“Good data out requires good data in”. I have heard many versions of that phrase over the course of my career. The statement could apply to a wide range of topics; however, as a chemist, the basic premise highlights to me the importance of proper sample preparation before analysis.
It is question and answer time and we are starting with TurboVap® evaporators and their use in an environmental lab. The TurboVap® evaporation system by design utilizes a patented gas vortex shearing technology. You may be asking yourself, “what does that mean?” I know I did when I first heard about it! Read on to … Continue reading What does gas vortex shearing do in evaporation? Why should I care?
Do you have issues seeing acceptable recovery of your phenols? I know I do. These compounds can be challenging to recover and quantitate, and are also found just about everywhere! Read on to learn a couple of fun facts about phenols, but first, let’s explain why phenols can be difficult to work with.
When working in a contract lab or any analytical testing lab, you may be prone to periods where it seems like there is never going to be a light at the end of the tunnel, as the samples just keep on coming in. For me, I always dreaded when spring rolled around and the whole … Continue reading Common Mistakes in the Lab
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 … Continue reading Biotage Horizon 5000 and FT-IR Detection – Expanded Detection Possibilities