Gerstel: Intelligent Automation for GC/MS and LC.MS

Material Emissions


Comparison of Standard Liquid Extraction and Direct Thermal Desorption GC/MS Techniques for the Analysis of Charcoal Filters used for Indoor Air Purification in a PCB Contaminated Building

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Keywords: Direct Thermal Desorption, Air Charcoal Filters, Air Filtration, PCBs in Air, Trace Analysis, Capillary GC-MS, Cooled Injection System CIS, PTV

ABSTRACT

Many buildings constructed from prefabricated elements are widely contaminated with PCB originated in e.g. elastic sealants which act as permanent sources for several years. Indoor air filtration is part of a restoration strategy for these buildings using activated carbon filter media [1]. The analysis of PCBs trapped on these filters is usually carried out using standard liquid extraction followed by GC/MS analysis of the extract. This standard technique will be compared to direct thermal desorption of the filter material in combination with cryo-focusing in the liner of a cooled injection system, followed by temperature programmed sample transfer to the analytical column. It will be shown that direct thermal desorption is a reliable and fast method for the determination of PCBs in air charcoal filters without requiring any sample pretreatment.


Direct Thermal Desorption GC/MS Analysis of Automotive Air Charcoal Filters

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Keywords: Direct Thermal Desorption, Air Charcoal Filters, Volatile Contaminants in Air, Capillary GC-MS, Cooled Injection System CIS, PTV

ABSTRACT

The analysis of volatile organic contaminants in air trapped on an automotive air charcoal filter is usually carried out using standard liquid extraction followed by GC/MS analysis of the extract. This standard technique will be compared to direct thermal desorption of the filter material in combination with cryo-focusing in the liner of a cooled injection system, followed by temperature programmed sample transfer to the analytical column. It will be shown that direct thermal desorption is a reliable and fast method for the determination of volatiles in automotive air charcoal filters without requiring any sample pretreatment


Characterization of Biogenic Emissions by Online Thermal Desorption Gas Chromatography/Mass Spectrometry

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Keywords: Biogenic, Plant Stress, GC/MS

ABSTRACT

The novel GERSTEL Online TDS G was developed to allow fast, reliable and continuous analysis of airborne compounds. For the described application the total analysis time, including GC run time, is about 1 hour. Sampling is done in parallel with gas chromatographic analysis.


Volatile Organic Compounds from Adhesives and their Contribution to Indoor Air Problems

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Keywords: Indoor Air Pollution, Thermal Desorption, Adhesives, Floor Coverings, Emissions, Bromophenol

ABSTRACT

Carpets for office use in most cases are applied with water-based adhesives. During the last decade the complaints about odors and emission of volatile organic compounds from these fitted carpets have increased dramatically, causing a major problem for indoor air quality. In a series of investigations it has been established that in many cases the adhesives used were the primary cause of complaints. This is initially surprising, since usually solvent free water-based dispersion adhesives were used. This paper describes the analytical approach of analyzing a broad variety of volatile compounds within a wide boiling point range with thermal desorption GC/MS.


Automated Online Desorption and Analysis of DNPH Derivatives of Airborne Aldehydes and Ketones

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Keywords: Sample Preparation, Lab Automation, Air Sampling, Environmental Analysis, Material Emissions

ABSTRACT

The analysis of airborne aldehydes and ketones first involves collection of the analytes by passing air through a cartridge containing 2,4-dinitrophenylhydrazine (DNPH). As the air passes through the cartridge, the analytes react with the DNPH to form hydrazones which are immobilized on the cartridge. The cartridges are then eluted with solvent and the DNPH derivatives determined using HPLC with UV detection.

The GERSTEL MultiPurpose Sampler (MPS) can be configured with a special tray to hold DNPH cartridges, enabling efficient automation of the entire process of desorbing the analytes and injecting the eluate into the LCUV system. Automating the desorption of these cartridges can significantly improve both accuracy and reproducibility. In addition, the risk of operator error is reduced. The MAESTRO software PrepAhead function enables desorption of a cartridge during the chromatographic separation of the previously injected sample. This means that the next sample is always prepared and ready to be injected as soon as the HPLC system has completed the previous analysis, ensuring maximum sample throughput.