 |
Improved Resolution of Triazine Herbicides Using LC–MS–MS and GC–MS
Kory Kelly and Kali Tudela, Phenomenex
Environmental laboratories are continuously pushed to deliver lower detection levels and faster sample throughput. A common analysis performed by these labs is triazine herbicides. This analysis can be performed by LC–MS–MS or GC–MS, for which Kinetex® core-shell UHPLC and HPLC columns and Zebron™ GC columns provide resolution and sensitivity improvements as well as time savings. Read More |
 |
Increased Throughput and Recoveries of Chlorinated Pesticides, Herbicides, and Organohalides Using Automated SPE and GC–ECD
Kali Tudela, David Gallagher, and Michael Ebitson (Horizon Technology, Inc), Phenomenex
End-capped Strata® C18-E SPE cartridges provide strong hydrophobic retention with negligible secondary polar interactions from active silanol groups. Pairing these cartridges with the fully automated Horizon Technology SmartPrep™ Cartridge Extraction system can increase productivity by preparing up to 12 samples. Read More |
Enantiomeric and Diastereoisomeric Resolutions of Chiral Triazole Fungecides Using Lux® Polysaccharide-Based Chiral Stationary Phases
Marc Jacob, Limig Peng, Michael Klein, Tom Cleveland, and Tivadar Farkas, Phenomenex
Reported here is the enantiomeric and diastereoisomeric separations of five fungicides containing two stereogenic centers using Lux polysaccharide-based chiral stationary phases. The reported separations are the results of a systematic screening of five different Lux phases in normal phase and reversed phase separation modes. For each compound screened, baseline resolution of the four different stereoisomers is provided with a run time below 25 min. Read More |
|
Chromatographic Enantioseparation of Racemic Herbicides Agents Using Lux Polysaccharide-Based Chiral Stationary Phases
Marc Jacob, Limig Peng, Michael Klein, Tom Cleveland, and Tivadar Farkas, Phenomenex
Reported here is the chiral chromatographic separation of various herbicide agents using Lux polysaccharide-based chiral stationary phases. The reported enantioseparations are the results of a systematic screening of five different Lux phases in normal phase and reversed phase separation modes. Read More |
|
|
 |
A Fast and Effective Approach to Analyzing Hormones in Drinking Water Using SPE and LC–MS–MS
Sueki H. Leung, Jenny Wei, Matthew Trass, Ali Haghani, and Andy Eaton, Phenomenex
A method is illustrated for steroid hormone analysis from drinking water using an optimized LC–MS–MS method, reducing analysis time from 50 min down to about 15 min while maintaining excellent linearity (0.99 R2 value or greater for each compound) and low minimum reporting levels (MRLs). The method presented uses a Gemini® 3 µm NX-C18 HPLC column, which delivers stability at pH 1–12. Read More |
|
Improved Recoveries of Polycyclic Aromatic Hydrocarbons (PAH) and Simultaneous Removal of Humic Acids from Water Using SPE and LC–MS–MS
Zeshan Aqeel, Seyed Sadjadi, and Erica Pike, Phenomenex
Polycyclic aromatic hydrocarbon compounds (PAHs) are effectively extracted from water samples while humic acids, which often interfere with chromatographic separation, are removed from the sample using an SPE sorbent, Strata® PAH. It was also found that Strata PAH provides consistent, high recoveries of all 16 analytes listed under EPA Method 550.1. Read More |
|
|
 |
Fast and Accurate Analysis of Polybrominated Diphenyl Esters (PBDEs) in a Single Run, Including BDE-209
Kory Kelly, Kristen Parnell, and Kali Tudela, Phenomenex
PBDE analysis has historically been problematic for two reasons: the large number of compounds and analyte stability. In addition, some of the congeners are thermally labile, sensitive to column activity, or both. Zebron™ ZB-SemiVolatiles represents a major improvement in the GC analysis of highly brominated flame retardants that can save labs both time and money, through decreased maintenance, increased revenues, and improved productivity. Read More |
|
|
 |
Improved Analysis of Semi-Volatiles and BNAs Using GC–MS
Kory Kelly, Phenomenex
An improved method for semi-volatiles has been exhibited on a Zebron ZB-SemiVolatiles GC column. The method includes fast run times while still maintaining resolution of key compounds like benzo[b]fluoranthene and benzo[k]fluoranthene and great peak shape of typically poor performing compounds like phenols and amines. Read More |
|
Enhanced Results of Diesel Range Organics Analysis with High Temperature GC Columns
Kali Tudela and Kory Kelly, Phenomenex
Petroleum hydrocarbon analysis is widely performed on soil and water samples to determine the presence and quantified levels of contamination from petroleum fuel products and crude oils. Fuel hydrocarbons are segmented into gasoline and diesel range organic groups (GRO and DRO). DRO compounds have boiling points similar to diesel fuel (C10-C28), ranging from 170–430 °C. These heavy compounds are amenable to GC–FID analysis; however, important considerations should be taken to ensure reproducible results over repeated injections. This study presents two methods for analyzing DROs using Zebron Inferno high temperature GC columns. Read More |
|
|
 |
Detection and Identification of Gulf Oil Dispersants by GC–MS and LC–MS–MS
Sky Countryman, Matthew Trass, Seyed Sadjadi, and Jeff Layne, Phenomenex
In an effort to contain the largest oil spill in United States history, nearly a million gallons of dispersant have been pumped into the Gulf of Mexico. Unfortunately, very little is known about the impact of these dispersants on humans, wildlife, and the environment. In this technical note we show how GC–MS with Zebron™ ZB-WAXPLUS™ GC columns can be used to detect COREXIT 9527 directly from seawater. To improve GC–MS stability, a cleanup procedure using the Strata™-X-A sorbent is used to virtually eliminate matrix interferences. The high efficiency Kinetex® core-shell columns simultaneously detect both COREXIT products at the low part per billion levels in seawater using LC–MS–MS. All solutions are optimized for high speed analysis and overall lab productivity. Read More |
|
|
