| Ask a Chemist |
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Which is more accurate, point or serial dilutions?
When diluting semi-volatile organic standards, serial dilutions have less uncertainty by a factor of 66%, based on the uncertainty around diluting. This is due to the volume being measured as well as the decreased # of measurements needed to make your curve. The actual uncertainties that we have calculated for a 5 point curve of 160, 120, 80, 50 and 20 ug/ml is 1.92% for point and 1.28% for serial dilutions. This assumes, of course, that a minimum number of mixes is being used (such as our BIG Mixes) to make up your highest concentration standard prior to serial dilutions. The largest error in a point dilution scheme is human, when somebody speaks to you while using a syringe to measure out your 15th or 30th measurement. This cannot be added to uncertainty calculations.
Note: We have expressed the uncertainty as a % of the 5 point curve’s expected error.
If you have a question for our chemists, just ask!!! |
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| News from SPEX CertiPrep Protocol Organics |
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Thank you to everyone who attended our "Clean Lab Techniques" webinar
SPEX CertiPrep's "Clean Lab Techniques" webinar was a huge success! We would like to thank everyone that attended. If you were unable to attend the webinar the presentation slides and recording are now available!
View the recording and presentation slides at your leisure!!
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A2LA Accreditation for Inorganic and Organic CRMs
SPEX CertiPrep, Inc. is proud to be accredited by A2LA for both Organic and Inorganic Certified Reference Materials (CRM). Now in addition to being registered as an ISO 9001:2000 facility, SPEX CertiPrep is accredited by A2LA as complying with the requirements of ISO/IEC 17025:2005 and ISO/IEC Guide 34-2000. The scope of our accreditation is the most comprehensive in the industry and encompasses all of the products SPEX CertiPrep manufactures. This new milestone establishes our continuing dedication to our customers for providing the highest quality standards. As always, SPEX CertiPrep wants to ensure Total Customer Satisfaction that’s why our motto has always been Superior Quality and Unparalleled Service. |
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New White Paper!
The Analysis of Laboratory and Consumer Water Sources for the Presence of BPA and Phthalates
SPEX CertiPrep has just released a new white paper on the presence of bisphenol-A (BPA) and phthalates in water from various laboratory and consumer sources.
The goal of the study was to examine the BPA and phthalate levels of several popular commercial bottled waters in comparison with municipal tap water and various samples of laboratory water from commercial sources and from de-ionized filtration systems. In addition, the study attempted to discover whether the phthalate and BPA levels increased after being heated for one week at temperatures equivalent to those reached inside an automobile during the summer.
NEW! We will be hosting a webinar on April 28 to present our findings and answer your questions about BPA and phthalates in water. If you would like to attend, register here for our 10AM or 2PM session (EDT). Space is limited, so sign up today!
You can read the abstract and view the presentation slides. To receive a copy of the full paper, please email crmsales@spexcsp.com or give us a call at 1-800-LAB-SPEX. |
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Recommended reading: Green Chemistry
Here are two books you can use to learn how to decrease your lab's environmental footprint:
Methods and Reagents for Green Chemistry: An Introduction by Pietro Tundo (Editor), Alvise Perosa, and Fulvio Zecchini is "…a good starting resource for readers seeking to employ sustainable chemistry." (Journal of the American Chemical Society, January 9, 2008).
Green Chemistry Metrics by Alexei Lapkin (Editor) and David Constable (Editor). When devising green chemistry techniques, you need a way to evaluate their "greenness". This book will show you how.
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Green Chemistry
The EPA's Green Chemistry Challenge promotes the "design of chemical products and processes that reduce or eliminate the use or generation of hazardous substances." There is only one Earth, and SPEX CertiPrep has embarked on an initiative to minimize our impact on the environment. We will investigate manufacturing techniques that are more environmentally friendly, find ways to minimize chemical waste, and reduce the paper waste generated by our offices. As we learn, we will be offering tips to you, the laboratories, to allow you to start your own green initiatives.
Stay tuned for more detailed information on our efforts!
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Take our OQ/PV product survey and you could win an iPod!
We are getting ready to launch our new service, OQ/PV Custom Standards Kits, and we need your input! As recommended by Good Laboratory Practice (GLP) and Good Manufacturing Practice (GMP), labs with analytical instruments should follow OQ/PV procedures to ensure their instruments are running in peak condition. Our OQ/PV Custom Standards Kits will be designed to provide your laboratory with a year supply of OQ/PV standards tailored specifically to your needs. We can manufacture the solutions in our ISO 9001-certified facility or you can send us your pre-made bulk solution. Either way, we will package the standards into single use sizes so you can be assured each individual standard will be homogeneous, free of contaminations, and consistent across the packaging run. Let us take the worry out of preparing standards!
Please take a few moments to complete our survey and let us know how to make these products better. Each submission will be entered into a drawing for a free iPod! Take the survey now… |
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Each month discover new and rewarding promotions on some of our most popular products. No registration is necessary and orders can be placed online!
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| SPEXertificate |
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The most comprehensive certificate available for your Certified Reference Materials is now available online. Search by Part Number and Lot Number for a quick, printable copy of your SPEXertificate.
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| MSDS |
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Save time by printing your MSDS directly from our website. Search our database by product, part number or element.
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