Chromatography

Rt-Msieve 5A Plot Columns

(Molecular sieve 5A)

Rt™-Msieve 5A PLOT columns are designed for efficient separation of Ar/O₂ and other permanent gases, including CH₅, C₂H₆, and CO. Special coating and deactivation procedures ensure chromatographic efficiency and the integrity of the porous layer coating. The high surface area of the Rt™-Msieve is generated by the pore structure present in the molecular sieve. Only compounds that can enter the pores will be exposed to this surface and will be retained. Molecular sieves have very high retention, allowing separations of permanent gases at temperatures above ambient. Additionally, Restek’s unique immobilization process guarantees that the uniform particles remain adhered to the tubing - even after continuous valve-cycling.

The deactivation technology also allows the CO peak to elute as a sharp peak. This is in contrast with other suppliers where CO often tails badly and cannot be quantified below % levels.

Application

• Permanent gas analysis
• Separation of Ar/O2 and H2/He at ambient temperature or above
• He, Ne, Ar, O₂, Xe, Rn, SF₆, CH₄, C₂H₆, CO
• Refinery or natural gas

Rt®-U-BOND PLOT Column

(divinylbenzene ethylene glycol/dimethylacrylate)

• Not moisture sensitive.
• Highly polarity phase.
• Use for the analysis of polar and nonpolar compounds.

Restek chemists have developed a new process for the manufacturing of porous polymer PLOT columns. The process incorporates the particles to the walls of the tubing, so there is virtually no particle generation. Because of the particle adhering to the walls of the tubing, there is reproducible performance from column to column, including selectivity and flow.

Application

• Unsataruted compounds
• Hydrocarbon gases
• Polar solvents

Rt-TCEP

(1,2,3-tris[2-kyanoetoxy]propan)

• Ideal for aromatics and oxygenates in gasoline.

Most gasolines contain aliphatic hydrocarbons up to n-dodecane (C12). To improve identification of the aromatics and oxygenates, it is desirable to elute benzene after C11 and toluene after C12. The extremely polar Rt™-TCEP stationary phase provides a retention index for benzene greater than 1100 and permits the separation of alcohols and aromatics from the aliphatic constituents in gasoline.

Rt™-TCEP columns have the same high polarity as TCEP packed columns (precolumns in ASTM Method D4815 for the analysis of petroleum oxygenates), with the efficiency of a capillary column. The result is a column that can separate a wide variety of compounds with an elution pattern unattainable using other high polarity siloxanes.

The Rt™-TCEP column incorporates a nonbonded stationary phase coated on a surface specialized for enhanced polymer stability and extended column lifetime. Solvent rinsing should be avoided. Conditioning is necessary only if the column is to be used at temperatures near the maximum operating temperature.

Applications

• Aromatics and oxygenates in gasoline

Rtx-OPPesticides2

• Application-specific columns for organophosphorus pesticides; best column combination for US EPA Method 8141A.
• Low bleed--ideal for GC/FPD, GC/NPD, or GC/MS analyses.

Using sophisticated computer modeling software, we created two stationary phases for separating the 55 organophosphorus pesticides (OPP) listed in EPA Method 8141A. Separation is improved, and analysis time is significantly reduced, compared to other columns. The extended upper temperature limit of these phases (330°C) allows analysts to bake out high molecular weight contamination typically associated with pesticide samples. The low bleed columns are a perfect match for sensitive detection systems.

Applications

• Organophosphorus pesticides

Rtx-OPPesticides

• Application-specific columns for organophosphorus pesticides; best column combination for US EPA Method 8141A.
• Low bleed--ideal for GC/FPD, GC/NPD, or GC/MS analyses.

Using sophisticated computer modeling software, we created two stationary phases for separating the 55 organophosphorus pesticides (OPP) listed in EPA Method 8141A. Separation is improved, and analysis time is significantly reduced, compared to other columns. The extended upper temperature limit of these phases (330°C) allows analysts to bake out high molecular weight contamination typically associated with pesticide samples. The low bleed columns are a perfect match for sensitive detection systems.

Applications

• Organophosphorus pesticides

Stx-CLPesticides2

• Application-specific columns for organochlorine pesticides and herbicides .
• Siltek® surface deactivation enhances responses for endrin, DDT, methoxychlor.

Many laboratories analyzing organochlorine pesticides struggle with breakdown and adsorption of endrin, DDT, and methoxychlor caused by active sites throughout the analytical system. Siltek® passivation technology enables these columns to offer unsurpassed inertness and the highest responses for active pesticides.

Applications

• Organochlorine pesticides and herbicides

Stx-CLPesticides

• Application-specific columns for organochlorine pesticides and herbicides .
• Siltek® surface deactivation enhances responses for endrin, DDT, methoxychlor.

Many laboratories analyzing organochlorine pesticides struggle with breakdown and adsorption of endrin, DDT, and methoxychlor caused by active sites throughout the analytical system. Siltek® passivation technology enables these columns to offer unsurpassed inertness and the highest responses for active pesticides.

Applications

• Organochlorine pesticides and herbicides

Rtx-CLPesticides2

• Application-specific columns for organochlorine pesticides and herbicides.
• Low bleed--ideal for GC/ECD or GC/MS analyses.
• Improved resolution and faster analyses, compared to 1701 or phenyl phases, make these the pesticide columns of choice.

Rtx®-CLPesticides columns are specially designed to overcome the coelutions and analyte breakdown typically encountered in chlorinated pesticide analyses for EPA Methods 8081, 608, and CLP. By achieving baseline resolution of the 20 target analytes, more accurate qualitative data can be obtained, providing reliable identification without GC/MS.

Column bleed, measured by ECD, is extremely low at temperatures up to 330°C, which is critical for baking-out the column to remove high-boiling compounds commonly found in pesticide/PCB extracts. An analysis time of less than 10 minutes improves throughput compared to other stationary phases. Baseline separations in less than 10 minutes.

Applications

• Organochlorine pesticides and herbicides

Rtx-CLPesticides

• Application-specific columns for organochlorine pesticides and herbicides.
• Low bleed--ideal for GC/ECD or GC/MS analyses.
• Baseline separations in less than 10 minutes.

Improved resolution and faster analyses, compared to 1701 or phenyl phases, make these the pesticide columns of choice. Rtx®-CLPesticides columns are specially designed to overcome the coelutions and analyte breakdown typically encountered in chlorinated pesticide analyses for EPA Methods 8081, 608, and CLP. By achieving baseline resolution of the 20 target analytes, more accurate qualitative data can be obtained, providing reliable identification without GC/MS.

Column bleed, measured by ECD, is extremely low at temperatures up to 330°C, which is critical for baking-out the column to remove high-boiling compounds commonly found in pesticide/PCB extracts. An analysis time of less than 10 minutes improves throughput compared to other stationary phases.

Applications

• Organochlorine pesticides and herbicides

Rtx-5 PONA

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

• Application-specific for detailed hydrocarbon analysis.

Applications

• Detailed hydrocarbon analysis