Finished Fuels（Gasoline / Aviation / Engine Fuels)

Compositional and performance testing of gasoline, diesel, aviation, and alternative fuels to assess quality, energy content, and combustion efficiency. Analytical methods help ensure fuel stability, safety, and regulatory compliance.

Organics Compounds in Gasoline

Overview

Finished gasoline contains a complex mixture of hydrocarbons and fuel additives that determine combustion efficiency, octane rating, and emission behavior. Among these, oxygenates (such as MTBE, ETBE, TAME, and ethanol) are added to enhance fuel combustion and reduce carbon monoxide emissions, while aromatic hydrocarbons — benzene, toluene, and C8–C12 aromatics— affect energy content, volatility, and toxicity. Monitoring these analytes is critical for product quality, safety, and compliance with environmental regulations such as ASTM D4815 and D5580, which limit aromatic and benzene content in commercial fuels. Accurate quantification ensures that gasoline formulations meet both performance and air-quality standards.

Test Methods

ASTM D5986-96

Solutions

Gas Chromatography with Flame Ionization Detection (GC-FID) is the standard method for separating and quantifying individual oxygenates and aromatic hydrocarbons in finished gasoline. The GC employs a non-polar capillary column under temperature programming to resolve C4–C12 hydrocarbons, while the FID provides sensitive and linear response to carbon content, enabling precise quantification. Benzene, toluene, and higher aromatics are identified through retention time matching with reference standards. Fourier Transform Infrared Spectroscopy (FTIR) complements GC-FID by providing rapid, non-destructive quantification of total aromatics and oxygenates through characteristic absorbance bands. When combined, GC-FID offers compound-specific accuracy while FTIR enables high-throughput screening—together ensuring reliable assessment of fuel composition, blending consistency, and compliance with regulatory and environmental specifications.

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Benzene in Spark-Ignition Engine Fuels

Overview

Benzene is an aromatic hydrocarbon naturally present in gasoline and a known air pollutant regulated due to its toxicity and carcinogenicity. In spark-ignition engine fuels, benzene content must be carefully monitored, as excessive concentrations can increase exhaust emissions and health risks while influencing combustion characteristics and octane performance. Determining benzene levels provides critical information for fuel quality assurance, regulatory compliance (e.g., ASTM D6277, EN 238), and environmental protection. Accurate quantification helps refiners and laboratories ensure that commercial gasoline formulations meet strict limits on benzene concentration, typically below 1% by volume.

Test Methods

ASTM D6277-07

Solutions

Fourier Transform Infrared Spectroscopy (FTIR) offers a rapid, reliable, and non-destructive method for determining benzene concentration in spark-ignition engine fuels. The technique measures characteristic infrared absorbance bands of benzene—particularly in the aromatic C–H stretching and ring vibration regions—without requiring complex sample preparation. Using a transmission or flow-through cell, spectra are collected and analyzed with chemometric calibration models based on reference standards. The FTIR system’s high spectral resolution and sensitivity allow accurate quantification of benzene even in complex fuel matrices. Compared with chromatographic methods, FTIR provides faster analysis, minimal solvent use, and excellent reproducibility—making it ideal for routine quality control, blending verification, and compliance testing in fuel production laboratories.

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Benzene, Toluene, and Total Aromatics in Gasolines

Overview

Aromatic hydrocarbons such as benzene, toluene, and higher substituted aromatics (C8–C12) are key constituents in finished gasolines that influence octane rating, combustion behavior, and emission characteristics. While toluene and other aromatics improve anti-knock performance, benzene is strictly regulated due to its toxicity and environmental persistence. Determining the concentration of these analytes is critical for quality assurance, formulation control, and compliance with fuel specifications such as ASTM D5769 and EN ISO 22854. Quantitative analysis of individual and total aromatics provides essential insight into product composition, blending consistency, and air-quality impact.

Test Methods

ASTM D5769-10

Solutions

Gas Chromatography coupled with Mass Spectrometry (GC/MS) is a highly sensitive and selective technique for identifying and quantifying benzene, toluene, and total aromatic hydrocarbons in finished gasolines. The GC separates hydrocarbon components by volatility on a non-polar capillary column, while the mass spectrometer detects and identifies each analyte based on its mass-to-charge (m/z) fragmentation pattern. Electron ionization (EI) enables detailed spectral fingerprints for accurate compound identification, even in complex fuel matrices. Calibration with certified reference standards ensures quantitative precision across a wide concentration range. Automated injection systems and temperature programming provide reproducible retention profiles, while data analysis software performs compound matching and total aromatic summation. GC/MS offers superior selectivity compared to FID-only methods, delivering precise aromatic profiles essential for regulatory compliance, fuel formulation optimization, and environmental impact assessment.

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Benzene in Gasoline

Overview

Benzene is an aromatic hydrocarbon naturally present in gasoline and used historically as an octane enhancer. However, due to its toxicity and carcinogenic nature, strict environmental and fuel-quality regulations limit benzene concentration in commercial gasoline to typically below 1% by volume. Accurate quantification of benzene is essential to ensure compliance with international standards such as ASTM D3606, EN 12177, and ISO 22854. Monitoring benzene levels also helps maintain product uniformity, control blending processes, and minimize environmental and health risks associated with vapor emissions.

Test Methods

GC-FID Methods for quantitative determination of Benzene in gasoline

Solutions

Gas Chromatography with Flame Ionization Detection (GC-FID) is the standard analytical technique for quantitative determination of benzene in gasoline. The GC system separates benzene and related aromatics (toluene, ethylbenzene, xylenes) on a non-polar capillary column under temperature programming. The FID responds proportionally to the number of carbon atoms ionized in the flame, providing linear and highly reproducible quantitative results. Calibration with certified benzene standards establishes a response factor for accurate quantification across the expected concentration range. Headspace or direct liquid injection techniques may be employed depending on sample volatility and precision requirements. The method conforms to ASTM D3606, which specifies column types (e.g., porous polymer or alumina-based stationary phases), carrier gas conditions, and retention-time criteria. GC-FID offers rapid, robust, and repeatable results—making it ideal for refinery laboratories and regulatory testing facilities monitoring benzene content in gasoline.

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Antioxidants in Aviation fuel

Overview

Aviation turbine fuels, such as Jet A and Jet A-1, contain trace quantities of naturally occurring peroxides and hydroperoxides that can promote oxidation during storage and operation. To mitigate this, antioxidants—commonly phenolic compounds such as 2,6-di-tert-butylphenol (DTBP) or 2,6-di-tert-butyl-4-methylphenol (BHT)—are added to stabilize the fuel and prevent gum formation, metal-catalyzed oxidation, and degradation of thermal stability. Monitoring antioxidant concentration ensures the additive is present at effective levels without exceeding specification limits. Accurate determination is essential for quality control, compliance with ASTM D1655 and DEF STAN 91-091 standards, and optimization of storage performance.

Test Methods

Learn more

Solutions

High-Performance Liquid Chromatography with Ultraviolet Detection (HPLC-UV) is a precise and selective technique for quantifying phenolic antioxidants in aviation fuels. Samples are typically diluted in an organic solvent such as n-heptane or isooctane and injected into a reverse-phase C18 column. The mobile phase—often a mixture of methanol and water or acetonitrile—achieves efficient separation of BHT and related phenolic compounds based on polarity differences. The UV detector monitors absorbance at characteristic wavelengths (typically 280 nm) corresponding to aromatic ring transitions. Calibration with certified antioxidant standards enables quantitative determination down to low mg/L levels. The HPLC-UV method provides high accuracy, reproducibility, and minimal sample preparation—making it ideal for verifying additive dosage, ensuring oxidation stability, and maintaining the quality and reliability of aviation fuels.

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Composition and Tar Content in Gas

Overview

The product gas from a biomass gasifier is a complex mixture of permanent gases (H₂, CO, CO₂, CH₄, N₂) and condensable organic compounds known as “tars.” These analytes directly influence the efficiency, stability, and cleanliness of the gasification process. Permanent gases determine the calorific value and combustion quality of the syngas, while tars—typically aromatic hydrocarbons and oxygenated organics—can cause operational issues such as pipeline fouling and catalyst deactivation. Accurate determination of gas composition and tar content is therefore critical for optimizing gasifier performance, evaluating feedstock conversion efficiency, and ensuring reliable operation in energy and fuel applications.

Test Methods

–

Solutions

Gas Chromatography with Thermal Conductivity Detection (GC-TCD) is a standard and robust technique for analyzing the permanent gas composition of biomass-derived syngas. The TCD detector provides a universal response suitable for H₂, CO, CO₂, CH₄, and N₂ quantification without requiring compound-specific calibration gases. Separation is achieved using packed or micro-packed columns—often molecular sieve for light gases and Porapak Q for CO₂ and hydrocarbons—connected in series or parallel configurations. For tar analysis, condensable species are typically collected on filters or in solvent traps and analyzed separately using GC-FID or GC-MS. GC-TCD’s stability, linearity, and ability to quantify major gas components make it ideal for characterizing gasifier performance, calculating gas yield and efficiency, and supporting process optimization in biomass energy systems.

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Established in 2003,

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