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Environmental
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Optimized Volatiles Analysis Ensures Fast VOC Separations
By Michelle Misselwitz, Innovations Chemist, Gary Stidsen, Product Manager, and Chris English, Innovations Manager
Optimized analysis allows for 36 runs per 12-hour shift, increased instrument productivity.
Rxi®-624Sil MS column inertness gives sharper peaks and more accurate data.
High temperature stability reduces bleed profile, resulting in lower detection limits.
Optimized conditions assure good resolution with minimal downtime.
Optimized methods for the analysis of volatile organic compounds (VOCs) can be time-consuming to develop because compound lists can be extensive and analytes vary significantly in chemical characteristics. For example, target compounds in EPA Method 8260 for solid waste matrices include volatiles that range from light gases (Freon®) to larger aromatic compounds (trichlorobenzenes). These differences make column selectivity, thermal stability, and inertness critical to resolving volatiles. Often, “624” type columns are chosen for their selectivity, but thermal stability is usually poor, which can result in phase bleed that decreases detector sensitivity. New Rxi®-624Sil MS columns offer reliable resolution of critical VOC pairs and also provide lower bleed and greater inertness than other columns. In order to provide optimized conditions for labs analyzing VOCs, we established parameters that ensure good resolution, while reducing downtime by syncing purge and trap cycles with instrument cycles. In addition, we present comparative data that demonstrate why Rxi®-624Sil MS columns are the best choice for volatiles analysis.
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New Wool Ensures More Accurate Semivolatiles Analyses
 By Scott Grossman, Innovations Chemist
Lower detection limits for 2,4-dinitrophenol with new wool for semivolatiles.
Improve data accuracy with complete sample transfer.
Extend column lifetime by reducing matrix contamination.
Ensuring success for semivolatiles analysis is dependent on several issues. The column is an important factor; however, even with a high performance column, other parameters can significantly impact final results. Liner choice is one of the most important noncolumn factors that affects end data and to take full advantage of the column's performance the analytes need to reach the column without degradation or discrimination. How much of the sample is transferred, how reproducible the transfer is, and how representative the data will be of the original sample are all influenced by injection port factors. In this article, we will demonstrate how liners with Semivolatiles Wool—a new wool, specifically designed for semivolatiles analysis—can be used to optimize the injection port for more complete sample transfer, increased accuracy, and lower detection limits.
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Analyse Haloacetic Acids in Under 13 Minutes with Rtx®-CLPesticidesColumns
By Jason Thomas, Environmental Innovations Chemist
Increase sample throughput with fast analysis times.
Complete separation of all target HAAs; two elution order changes.
Excellent for other GC/ECD methods—fewer column changes means less downtime.
Fully resolve HAAs under high throughput conditions.
Modern water treatment technologies provide safe, reliable drinking water and have substantially curbed outbreaks of water-borne diseases such as typhoid and cholera. However, the use of disinfectants in water treatment facilities can also lead to adverse health effects caused by the formation of disinfection byproducts (DBPs). DBPs are created by the reaction of the disinfection agent with naturally occurring organic matter and inorganic salts. Haloacetic acids (HAAs), for example, are a type of DBP that can form when chlorine is used as a disinfectant. DBP levels must be monitored in potable water supplies to ensure that the maximum allowable levels are not exceeded. Testing for HAA compounds in drinking water is usually done according to EPA Method 552.2; however, labs using this method struggle with low sample throughput due to long analytical run times.
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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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