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Environmental
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Reliably Detect Pesticides Down to 10pg with Sensitive SIM GC/MS Multiresidue Method
By Jason Thomas, Environmental Innovations Chemist
Market demands are increasing for multiresidue pesticide methods that are both sensitive and effective across a broad range of compound chemistries. The Rxi®-5Sil MS column gives you accurate low level results for a wide variety of analytes in a single run.
As labs operate in an extremely competitive market, the demand for more sensitive multiresidue pesticide methods is increasing. A GC/MS method is a logical choice, as this instrument provides a high degree of specificity, yet is relatively inexpensive and easy to operate, compared to LC/MS/MS, high resolution MS, or GC/MS/MS. However, to take full advantage of GC/MS, careful column selection is critical. The column used must be of the proper selectivity to separate compounds that share common spectra, and also exhibit a high degree of inertness and minimal bleed. Here we demonstrate the effectiveness of an Rxi®-5Sil MS column for low level analysis of a wide variety of pesticides differing in volatility, compound class, and degree of activity.
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Develop More Productive PPCP Methods with a Single Ultra II® Aromax Column |
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Develop More Productive PPCP Methods by Replacing C18 and HILIC Columns with a Single Ultra II® Aromax Column
By Michelle Misselwitz, Innovations Chemist, Steve Kozel, HPLC Marketing Manager, Julie Kowalski, Innovations Chemist, Becky Wittrig, Ph.D., Global HPLC Specialist, and Amanda Rigdon, Innovations Chemist
- Use 1 column instead of 2—no need for separate HILIC analysis.
- Better response than on a C18; higher retention reduces ion suppression from coeluting compounds.
- Lower detection limits—highly organic mobile phase improves sensitivity.
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13 Minute Chlorophenoxyacid Herbicides Analysis
On New Rtx®-CLPesticides & Rtx®-CLPesticides2 Columns
Jason Thomas, Environmental Innovations Chemist
- Higher throughput compared to typical methods of 20 minutes or more.
- Use one column pair for multiple dual column ECD methods.
- Versatility and durability to harsh samples lead to longer life and less down time.
The analysis of chlorophenoxyacid herbicides is a very common assay performed routinely in most environmental laboratories today. Chlorophenoxyacid herbicides, as a group, are used to prevent the growth of broadleaf plants in agricultural fields. The most common, 2,4-D, was introduced around the end of World War II, and with simple additions or deletions of chlorine or methyl groups during production, a wide variety other herbicides can be produced. However, improper monitoring of manufacturing conditions can lead to undesirable impurities, such as 2,3,7,8-TCDD.
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Reduce Acetonitrile Use by Analyzing PAHs with Methanol-Based Mobile Phase |
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Reduce Acetonitrile Use by Analyzing PAHs with Methanol-Based Mobile Phase
By Michelle Misselwitz, Innovations Chemist
- Save £30 per litre using methanol instead of acetonitrile.
- Resolve PAHs to baseline using a Pinnacle® II PAH column.
The recent acetonitrile shortage has resulted in limited availability and significantly increased solvent costs. In response, many labs are interested in alternate mobile phases for HPLC methods. Here we present an effective method for analyzing polycyclic aromatic hydrocarbons (PAHs) using methanol, instead of acetonitrile, resulting in a significant cost savings while maintaining baseline resolution of all target compounds.
Strategies to Reduce Acetonitrile Dependency
Save money by switching to a methanolic mobile phase.
Acetonitrile use can be reduced several ways, including decreasing column inner diameter, scaling down methods to ultra-high pressure liquid chromatography (UHPLC), or using an alternate mobile phase. While analysis times can be cut in half by using UHPLC, this technique creates significant backpressure and high pressure capacity pumps are required. For labs that do not have UHPLC equipment, using alternative solvents can be an effective way to reduce acetonitrile use without having to purchase new equipment.
Methanol-Based PAH Method Saves Labs Money
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3-Fold Faster Polybrominated Diphenyl Ether (PBDE) Short Column Method |
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3-Fold Faster Polybrominated Diphenyl Ether (PBDE) Short Column Method
By Jason Thomas, Environmental Innovations Chemist, Gary Stidsen, Product Manager, and Jack Cochran, Director of New Business and Technology
- Increase sample throughput with 3-fold faster analysis times.
- Proprietary deactivation reduces thermal breakdown, giving high BDE-209 response and excellent peak symmetry for all PBDE congeners.
- Meets all method criteria and reliably separates BDE-49 and BDE-71.
Use new 15m Rtx®-1614 columns for fast, reliable PBDE analysis.
Polybrominated diphenyl ethers (PBDEs) are highly effective flame retardants and have been instrumental in protecting both lives and property. Despite these benefits, many PBDEs have been banned or are being phased out because of concern surrounding negative health effects related to the ubiquitous presence of PBDEs in humans and the environment. While exposure mechanisms and pathways are not completely understood, bioaccumulation of these lipophilic compounds is a concern as PBDEs have been linked to toxic, neurological, and reproductive problems. Due to a growing need to monitor PBDEs in the environment, rapid and accurate methods are increasingly in demand.
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