Seminários em vídeo

How do we find what we don't specifically look for? This presentation will look at non-target GCxGC for environmental forensics, or exposomic analysis, of wastewater, specifically the semivolatile organic fraction, and what can be done when discovered non-targets may present health impacts. Frank L. Dorman, Penn State University Dept of Biochemistry and Molecular Biology & Dartmouth College Dept of Chemistry

Carbon and nitrogen are two of the primary nutrients of vital importance to the physiology of plants. Carbon content in soil plays in important role in the growth and development of plants. Plant foods or fertilizers with blends of multiple plant nutrients often including nitrogen. The amount of nitrogen in the fertilizer is optimized for the plant type that is being grown. The LECO 828 and 928 series of determinators can quantify the amount of carbon and nitrogen in soils, fertilizers, and plants. This webinar will focus on quantifying both carbon and nitrogen in these matrices.

The presentation will outline TOC determination in soil using two different approaches. First, we will explore the use of acid treatment of the soil to remove carbonates followed by analysis using conventional combustion techniques. Next, we will explore using a ramped furnace temperature approach to differentiate organic and inorganic carbon species. TOC results from both approaches will be presented. Jeffrey Gast

Sulfur is one of the essential macronutrients required for plant growth, aiding the formation of amino acids and proteins, as well as chlorophyll formation. Initiatives to reduce sulfur emissions have led to less sulfur being deposited in soil, causing an increased use of sulfur-containing fertilizers; resulting in an increased demand for sulfur determination in fertilizers, soils and plant tissue. This webinar will outline several combustion based approaches for sulfur determination in these materials. Lloyd Allen

Utilizing LECO 832 and 928 Instrument Series for Sulfur Determination

Water content in soil and plant tissue is an important parameter that can influence crop growth, yield, and quality. In addition, moisture plays an important role in commerce and storage of food products. Determination of ash in soil can be used to approximate the organic content of the soil.

Water content in soil and plant tissue is an important parameter that can influence crop growth, yield, and quality. In addition, moisture plays an important role in commerce and storage of food products. Determination of ash in soil can be used to approximate the organic content of the soil. This webinar will review the Thermogravimetric determination of moisture and ash in soil and plant tissue. Jeffrey Gast

History and development of LECO Identification Grading System (IGS), developed from involvement in EPA's Non-Targeted Analysis Collaborative Trial (ENTACT). Presented by Todd Richards, LECO Separation Sciences Service Manager, as part of the LECO 2020 GCxGC Symposium.

Christina Kelly (LECO Applications Chemist) demonstrates how to use the classification tools of ChromaTOF® software. Presented as a portion of the LECO 2020 GCxGC Symposium.

Gas Chromatography Mass Spectrometry data can be analyzed to determine region of origin of various ingredients, such as vanilla or cinnamon, based on known analytes. Marlene Moskowitz, Senior Scientist, McCormick & Company, discusses how their labs utilize GCMS to determine product flavor profiles.

The Pegasus BT 4D determines key aromatic compounds in pumpernickel bread; GCxGC benefits for the analysis of beer and hops samples. Presented by Lena Dubois and Liz Humston-Fulmer, LECO Corporation.

An overview of GCxGC mass spectrometry and improved flavors in vegetarian foods. ChromaTOF Tile was utilized to review chromatography data. Presented by Hans-Gerd Janssen, Science Leader Unilever Research, Professor Recognition-based Analytic Chemistry at Wageningen University & Research, and Ed Rosing, Analytical Flavour Scientist at Unilever R&D Vlaardingen.

Copresenters Renee Cataneo & Mayur Mundada [Menssana Research Inc.] discuss data obtained through GCxGC TOF-MS analysis of breath samples. Originally presented 20 September 2012.

The StayClean Ion Source dramatically reduces system downtime. The only maintenance this source requires is periodic filament replacement. This video walks through the simple process of changing the filament.

Three GC/MS Experts embrace the 'spookier' side of mass spectrometry.

Jane Hill, from the University of British Columbia, brings her expertise on 'omics and medical diagnostics in Disease: Trick or Treat? Metabolomics is changing how we monitor our health

Albert Lebedev, professor at the Faculty of Chemistry at Moscow State University, has suggestions and advice for what to do if you meet a mummy (and happen to have access to mass spectrometry!) in What Mass Spectrometry can tell you about 5000 year old Mummies

Shari Forbes, Director of Canada's Secure Site for Research in Thanatology, will finish the symposium with a look into GCxGC mass spectrometry and the wider range of research and training that can come from Canada's first body farm in Death, Decomposition and Dogs

Cement Clinkers are an intermediate product in the production of Portland Cement, one of the key ingredients in the manufacturing of concrete. Microscopic examination and analysis of Clinkers is a Quality Assurance process that assesses the nature and quality of Clinker constituents. This Webinar will discuss the process of sample preparation, microscopic examination, and the assessment of Cement Clinkers.

Determination of carbon and nitrogen in construction materials plays an important role in maintaining quality and durability of these products. This webinar will focus on this application using both the LECO CN928 and the C832. Data will be presented from a wide range of materials used in the construction industry. | Presented by Fred Schultz, Applications Chemist

Thermogravimetric analysis (TGA) is a widely used technique for Moisture or Loss on Ignition (LOI) determination in various materials. This webinar will explore enhancements in the method technique to characterize mass loss in specified materials using LECO TGA instruments. The methods discussed will include Split Loss in Cement, LOI in Combustion Residues following ASTM D7348, LOI in Flue Gas Desulfurization Solids following ASTM D8339 and Moisture and LOI in Hydrated Lime. | Presented by Jeffery Gast, Lead Analytical Chemist