More about chromatography

Rtx-TNT

• Application-specific columns for explosives in US EPA Method 8095.
• Low bleed--ideal for ECD analysis.
• Complete analysis in less than 20 minutes.
• Rtx®-TNT2 confirmation column provides 8 elution order changes under same conditions.

We designed Rtx®-TNT and Rtx®-TNT2 columns specifically for analyses of nitroaromatic compounds by GC/ECD, such as the 16 analytes listed in US EPA Method 8095. They provide better resolution and higher thermal stability than any other currently recommended columns. Operate the Rtx®-TNT primary column and Rtx®-TNT2 confirmation column under identical GC oven temperature programs.

Applications

• Explosives

Rtx-PCB

• Unique polymer for PCBs analysis by GC/ECD or GC/MS.
• Good results for other semivolatiles.
• Low polarity; inert to active compounds.

Applications

• PCBs

Rtx-502.2

(proprietary Crossbond® diphenyl/dimethyl polysiloxane phase)

• Application-specific columns with unique selectivity for volatile organic pollutants. The Rtx®-502.2 column is cited in US EPA Method 502.2 and in many gasoline range organics (GRO) methods for monitoring underground storage tanks.
• Excellent separation of trihalomethanes; ideal polarity for light hydrocarbons and aromatics.

An Rtx®-502.2 column will enable you to quantify all compounds listed in US EPA methods 502.2 or 524.2, whether you use a mass spectrometer or a PID in tandem with an ELCD. The diphenyl/dimethyl polysiloxane based Rtx®-502.2 stationary phase provides low bleed and thermal stability to 270°C. A 105-meter column can separate the light gases specified in EPA methods without subambient cooling. Narrow bore columns can interface directly in GC/MS systems.

Applications

• Volatile organic pollutants

Rtx-5 Amine

(Crossbond® 5% diphenyl/95% dimethyl polysiloxane)

• Application-specific columns for amines and other basic compounds.
• Low polarity phase.

Active basic compounds that otherwise require derivatization, or an alternative analytical technique, can be analyzed on an Rtx®-5 Amine column. The tubing surface is chemically altered to reduce tailing of basic compounds, eliminating the need for column priming. An Rtx®-5 Amine column is ideal for analyzing a wide variety of basic compounds, but breakthrough technology also allows the analysis of neutral compounds, adsorptive compounds with oxygen groups susceptible to hydrogen bonding, or even weakly acidic compounds such as phenols. Every Rtx®-5 Amine column is tested to ensure that it exceeds the requirements for analyzing ppm levels of amines, without priming, and to ensure low bleed at maximum operating temperature.

Applications

• Alkylamines
• Diamines
• Triamines
• Ethanolamines
• Nitrogen-containing heterocyclics

Rtx-35 Amine

(Crossbond® 35% diphenyl/65% dimethyl polysiloxane)

• Application-specific columns for amines and other basic compounds.
• Midpolarity phase.

Active basic compounds that otherwise require derivatization, or an alternative analytical technique, can be analyzed on an Rtx®-35 Amine column. The tubing surface is chemically altered to reduce tailing of basic compounds, eliminating the need for column priming. An Rtx®-35 Amine column is ideal for analyzing a wide variety of basic compounds, but breakthrough technology also allows the analysis of neutral compounds, adsorptive compounds with oxygen groups susceptible to hydrogen bonding. Every Rtx®-35 Amine column is tested to ensure that it meets the requirements for analyzing ppm levels of amines, without priming, and to ensure low bleed at maximum operating temperature.

Applications

• Alkylamines
• Diamines
• Triamines
• Ethanolamines
• Nitrogen-containing heterocyclics

Rtx-VRX

(proprietary Crossbond® phase )

• Application-specific columns for volatile organic pollutants.
• Excellent for US EPA Method 8021 compounds.

The Rtx®-VRX stationary phase and optimized column dimensions provide low bleed, excellent resolution, and fast analysis times for volatile compounds.

Applications

• Volatile organic pollutants

Rtx-VGC

(proprietary Crossbond® phase )

• Application-specific columns for volatile organic pollutants by GC/PID/ELCD. Excellent separation of trihalomethanes.
• Complete US EPA Method 8021A analysis in less than 28 minutes.
• Restek exclusive phase.

Using computer modeling techniques, we optimized the Rtx®-VGC column for analysis of volatile organic compounds on GC systems equipped with photoionization (PID) and electrolytic conductivity detectors (ELCD). It performs the most difficult separations of volatile organic compounds, such as those listed in US EPA Methods 502.2 and 8021, providing unsurpassed separation in the fastest analysis time, thereby increasing sample throughput. The Rtx®-VGC column provides >=85% resolution of trihalomethanes (THMs) from other volatile compounds. This unique column also achieves excellent separation of gases and early eluting compounds.

Applications

• Volatile organic pollutants

Rtx-Dioxin2

• Isomer specificity for 2,3,7,8-TCDD and 2,3,7,8-TCDF achieved with one GC column.
• Thermally stable to 340°C for longer lifetime.
• Unique selectivity for toxic dioxin and furan congeners allow use as a primary or confirmation GC column.

Applications

• Dioxin or furan congeners

Rtx-Dioxin

• Replacement column for 5% diphenyl phases.
• Improved separations of dioxin or furan congeners.
• Greater thermal stability than 5% diphenyl phases or high-cyano confirmation columns.

Applications

• Dioxin or furan congeners

Rtx-2887

(Crossbond® 100% dimethyl polysiloxane - optimized for simulated distillation)

• Application-specific columns for simulated distillation.

Rtx®-2887 columns' stationary phase, column dimensions, and film thickness have been optimized to exceed the resolution and skewing factor requirements currently specified in ASTM method D2887. Each column is individually tested to guarantee a stable baseline with low bleed and reproducible retention times. The Crossbond® methyl silicone stationary phase has increased stability compared to packed columns, ensuring stable baselines and shorter conditioning times.

Applications

• Simulated distillation