Agilent Manuals

Agilent 7890A gas chromatograph GC x GC technology introduction

This application describes a method for determining the ester and linoleic acid methyl ester content of fatty acid methyl esters (FAME) intended for use as pure biofuel or as a blending component for heating and diesel fuels. The method is suitable for FAME con- taining methyl esters between C14 and C24. This applica- tion used the Agilent 6850 System and HP-INNOWax column; calibration was achieved with internal standards of methyl heptadecanoate. After analyzing several differ- ent types of biodiesel, excellent precision was obtained, exceeding the EN14103 method specifications.

This application note describes the use of the Agilent 1200 Series Rapid Resolution LC (RRLC) system for the separation of antioxidants and erucamide. The system can operate significantly faster than conventional HPLC systems without sacrificing resolution, precision, or sensitivity. The column chemistry and temperature influence on the separation and the sample preparation method are also discussed.

This document describes the use of vitamin E (tocopherol), phenolic antioxidants, and erucamide slip additives in polypropylene homopolymer formulations, as well as their analysis and detection using liquid chromatography with ultraviolet/visible detection. The Agilent 1200 Rapid Resolution LC system with Agilent ZORBAX RRHT columns allows for rapid separation of these antioxidants with the same or improved resolution. The Agilent method translator can be used to convert the ASTM method into new methods based on instrument parameters, column dimensions, and particle size in three modes: simple conversion, speed optimized, and resolution optimized methods.

This document describes an improved chromatographic method for monitoring the bisphenol-A manufacturing process using Agilent RRHT Eclipse XDB-C18 columns. These columns use 1.8-µm particles versus conventional 3.5-µm or 5-µm particles, allowing seven times faster analyses, improved resolution, and higher sensitivity.

This Application Note demonstrates how a daily throughput of far more than 1000 samples can be achieved together with full spectral data acquisition and accurate mass information with close to FT-MS mass accuracy using the Agilent 1200 Series Rapid Resolution LC system and the Agilent 6210 TOF MS.

The Agilent 7500ce ICP-MS is shown to be an excellent analytical tool for the elemental analysis of gasoline. It offers the best detection limits of any multi-element tech- nique and a full elemental analysis suite that takes less than 5 minutes to acquire. The Octopole Reaction System (ORS), integral to the 7500ce, ensures that a single method and set of conditions can be used to directly determine all elements of interest in the sample. Comparison data for selected elements in both gas mode and no-gas mode highlight the effectiveness of the ORS for interference removal. Results showing the excellent long-term stability of the 7500ce ORS are also given.

A rapid simulated distillation method is described for analysis of petroleum fractions boiling within the range of ASTM D2887. The method employs an Agilent 6890N gas chromatograph equipped with a split/splitless inlet, flame ionization detector (FID), oven insert, and 3-meter 180-µm id capillary column. Compared to conventional ASTM D2887, the accelerated method yields run times at least two times faster. It yields results comparable to traditional D2887, and agrees with the guidelines of ASTM method D2887 based on published results for the reference gas oil (RGO).

A new method for the analysis of trace methanol in crude oil samples was developed based on two-dimensional heart-cutting gas chromatography. The method was tested on an Agilent 6890N GC system equipped with a new gas phase microfluidic Deans switch that improved the performance of heart-cutting two-dimensional gas chromatography. The results obtained with this method exceeded the performance requirements of ASTM D7059 for the analysis of methanol in crude oil.

This application describes a method for determining the content of benzene and toluene in motor and aviation gasoline using an Agilent 6820 gas chromatograph (GC) system and ASTM Method D3606. The method uses an internal standard to calculate the concentration of each component and employs Agilent Cerity NDS software for GC control and data analysis. This application demonstrates that calibration and precision meet or exceed the ASTM D3606 specifications.

The document describes an analytical method for the determination of ethers and alcohols in gasolines using the Agilent 6820 gas chromatography system. This method utilizes a 10-port switch valve and two columns. The specific compounds determined include methyl tert-butylether (MTBE), ethyl tert-butylether (ETBE), tert-amylmethylether (TAME), diisopropylether (DIPE), methanol, ethanol, isopropanol, n-propanol, isobutanol, tert-butanol, sec-butanol, n-butanol, and tert-pentanol. 1,2-dimethoxyethane (DME) is used as the internal standard for quantitative analysis. The Agilent 6820 GC is used to run ASTM Method D4815 for determining oxygenates in gasoline.

This application note describes a method for determining benzene, toluene, ethylbenzene, p/m-xylene, o-xylene, C9 and heavier aromatics, and total aromatics in finished gasoline using the Agilent 6820 GC System.

A two-dimensional gas chromatographic method (GC-GC) is described for the analysis of trace benzene in styrene. This method uses the Agilent 6890N GC system equipped with a Deans switch device. The method can be used in a prefractionator mode to analyze trace benzene in styrene according to the proposed ASTM method [1]. It can also be used in a heart-cutting mode to transfer more precisely just the benzene peak from the primary column to the sec- ondary column. The Agilent 6890N electronic pneumatics control and flow calculation software are used for setting up the precise flows and pressures required. Excellent calibration and sensitivity of this system is demonstrated in both prefractionator mode and heart-cutting mode, and the interference can be greatly reduced by the heart-cutting.

This application describes the improved performance for the analysis of aromatics in gasoline by ASTM Method D5769 using the Agilent 5973 inert gas chromatography/mass spectrometry (GC/MS) system.