Showing 1 - 10 of 12 results

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A True Six-Channel Solution for Impurities in Ethylene, May 2019.1 [AN013]

INTRODUCTION: Ethylene is one of the highest volume chemicals produced in the world, with over 100 million metric tons produced annually. Ethylene is primarily used in the manufacture of polyethylene, ethylene oxide and ethylene dichloride. Impurities in ethylene can damage catalysts, resulting in
significant replacement costs, reduced product quality, process downtime and decreased yield. Ethylene is manufactured through the use of steam
cracking, in which gaseous or light liquid hydrocarbons are heated to 750-790°C in a pyrolysis furnace. Larger hydrocarbons are cracked into smaller hydrocarbons with the formation of unsaturated and olefinic compounds being produced. Ethylene feedstocks must be tested to ensure that only high purity ethylene is delivered for chemical processing.

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Analysis of Total Petroleum Hydrocarbons using Temperature Programmed Large Volume Injection, May 2019.1 [AN010]

INTRODUCTION: Mineral oils are typically found in water, foods and soils. These mineral oils can be extracted using different solvent; most popular are hexane and petroleum ether. As concentrations can be very low, some sort of sample enrichment is often used, e.g. rotary evaporation. If, however, a Large Volume Injection (LVI) technique is used, sample pretreatment becomes easier and sample throughput can be increased significantly. This application note describes the analysis of mineral oils (or Total Petroleum Hydrocarbons / TPH) using the Scion 456-GC gas chromatograph equipped with a Programmable Temperature Vaporizer (PTV) Injector and the Select™ Mineral Oil column. The column stationary phase was tuned for separation and stabilised for high
temperature operation. The upper temperature limit of the column is 400 °C. This system is suited to the DIN-ENISO 9377-2 method that replaced DIN H53.

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Determination of Free and Total Glycerine and mono-, di-, triglyceride content in B-100 Biodiesel Methyl Esters according to EN 14105

INTRODUCTION The European Standard method, EN-14105, is used to determine the free glycerol and residual mono-,di- and triglyceride contents in fatty acid methyl esters (FAME) typically intended for addition to mineral oils. Total glycerol content is calculated from the results obtained. The method is suitable for FAME from rapeseed, sunflower and soybean oils, but is not suitable for FAME produced from or containing coconut and palm kernel oils due of the problem of peak overlapping. This method and ASTM D6584 are two of the most used standardized analytical methods used for the analysis of biodiesel.

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Fast Trace Analysis in Ultra High Purity Helium using Parallel Columns and a Single PDHID Detector

Low level detection of permanent gases and carbon dioxide is essential for Ultra High Purity helium since traces of these components affect the quality and thus the value of the helium gas. The quantification of trace gases is highly applicable using Gas Chromatography (GC) due to the complete separation of the analytes prior to detection, and in addition, the non-sensitivity of the Pulsed Discharge Helium Ionization Detector PDHID) to helium. Performing a complete separation of permanent gases and carbon dioxide by GC is not possible using a single column. The common solution is a configuration of two identical analytical channels with the two columns having a different type of stationary phase. By optimisation of the column dimensions, it is possible to combine the two columns into one channel. This application note describes the trace analysis of permanent gases and carbon dioxide in helium using a single channel configuration with two

295 KB

Fast Trace Analysis in Ultra High Purity Helium, May 2019.1 [AN007]

Introduction: Low level detection of permanent gases and carbon dioxide is essential for Ultra High Purity helium since traces of these components affect the quality and thus the value of the helium gas. The quantification of trace gases is highly applicable using Gas Chromatography (GC) due to the complete separation of the analytes prior to detection, and in addition, the non-sensitivity of the Pulsed Discharge Helium Ionization Detector (PDHID) to helium.

357 KB

The Analysis of Electronic Cigarette E-Liquids by GC-MS [AN_0037]

INTRODUCTION: There are over 35 million electronic cigarette users worldwide with the global vapour product market at over £17 billion pounds[1]. Although they are widely used, there is limited characterisation of the composition of e-liquids used during vaping. As vaping becomes an increasing trend, regulations are being introduced for electronic cigarettes and e-liquid manufacturers worldwide. The Tobacco Products Directive 2014/14/EU has recently introduced a limited guideline on the manufacturing of e-liquids[2]. These guidelines are more focused on the concentration of nicotine, caffeine, taurine and colourings rather than flavourings and impurities. Although there are labelling requirements in place, there is no current regulation on a comprehensive list of ingredients; the majority of e-liquids only define propylene glycol, vegetable glycerin and nicotine as ingredients. Scion Instruments developed a method for the quick and easy compositional analysis of e-liquids by gas chromatography with mass spectrometry. Along with the vendor listed compounds, various flavour compounds and impurities were identified.

Showing 1 - 10 of 12 results