chromatography column Articles
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High Resolution Detailed Hydrocarbon Analyses by Capillary Column Gas Chromatography
In the petrochemical industry, samples such as petroleum naphthas and gasolines routinely must be quantitatively separated into their individual components. Because these petroleum-derived samples consist of hundreds of compounds, petroleum analysts require chromatography columns that offer high resolution. We have developed polar and nonpolar capillary gas chromatography columns to provide the ...
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Best practice for separation columns in ion chromatography (IC) - Part 3
This is the third and final post in our series providing you with tips and tricks on the proper use of ion chromatography columns. In the first part, we mostly discussed the standard operation conditions as well as operational limits for columns, while in the second post, we focused on application related topics and what elution parameters can be changed to modify the separation performance. In ...
By Metrohm AG
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Separation and identification of organic compounds from thermally dissolved Shengli lignite in a methanol/benzene mixed solvent
Thermal dissolution of Shengli lignite was conducted in a methanol/benzene mixed solvent at 240°C for 1 h. The soluble fraction was sequentially eluted with petroleum ether (PE) and carbon disulfide (CDS)/PE mixed solvents with increased CDS to PE ratio through a silica gel–packed column. A series of normal alkanes, polycyclic aromatics, methyl alkanoates, alkanoic acids, and fatty acid amides ...
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Chromatography plays its part in turning Science Fiction into Science Fact
Tomek Bagiński’s short film Ambition picks up on a fundamental drive of human kind, a thirst for knowledge and understanding, a thirst that can be sated through projects like Rosetta which are turning science fiction into science fact: Ambition the film Rosetta is an ESA mission with contributions from its Member States and NASA. Rosetta’s Philae lander provided by a consortium ...
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Gas chromatography - What are Columns?
Liquid and gas chromatography instruments wouldn't work without columns. Both liquid and gas chromatography analyze samples by separating them into their individual chemical components. A column, a long tube lined with specialized chemicals, is required for this process as it forms part of the instrument which performs the separation. When a sample makes its way through the tube, certain ...
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GC Analyses of Polynuclear Aromatic Hydrocarbons
Polynuclear aromatic hydrocarbons (PAHs) can be separated by packed column or capillary column gas chromatography. An SPB-5 bonded phase fused silica capillary column separates the 16 PAHs considered priority pollutants in wastewater by the US Pal SP-301, a liquid crystal stationary phase in packed GC columns, resolves benzo(e)pyrene and benzo(a)pyrene. This publication discusses conditions, ...
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Sepacore for the Separation of Plant Extracts - Case Study
Customer: University of Basel, Switzerland The Division of Pharmaceutical Biology at the University of Basel in Switzerland is a center of excellence for natural product and medicinal plant research. It belongs to the Departement of Pharmaceutical Sciences, a leading research and teaching center in drug discovery & development, drug therapy and drug safety. Research groups collaborate and ...
By BUCHI
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Pfizer Case Study: Single-use Conversion
The challenge Pfizer was looking to accelerate the development of 2 biosimilar monoclonal antibodies (mAbs) to achieve regulatory approval. Their goal is to be first to market in China. In order to meet their aggressive timelines, they needed to implement single-use technologies in place of stainless steel in under 6 months. The solution Summary GE’s Fast Trak scientists took a hands-on ...
By Cytiva
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Biosorptive separation of 'labile' fractions of copper and lead from river sediments and evaluation by differential pulse, anodic stripping voltammetry
The 'labile' copper and lead metal contents of contaminated sediments were extracted in different chemical solutions and then subjected for biosorptive separations. The sorbents called 'AlgaSORB-sp' and 'AlgaSORB-ch' were derived from two different algae, viz., Spirogyra and Chlorella, respectively . The metal detection was made by differential pulse, anodic stripping voltammetry. The retention ...
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U.S. EPA volatile organics method 524.2 using PURGE and TRAP GC/MS
Clean drinking water is of worldwide interest. Contaminants can compromise the quality of a water supply and cause short- and long-term health effects. Stringent water quality criteria help to ensure safe drinking water by requiring the detection and quantification of a wide variety of contaminants at extremely low levels. U.S. EPA Method 524.2 (1) provides the guidance necessary for identifying ...
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Phycotoxins in the marine environment: control of marine organisms for contamination with algal toxins
On a global scale, the frequency and intensity of toxic algal blooms appear to be on the rise. There is also evidence of geographic spreading of toxic strains. Therefore, it is necessary to establish methods for the evaluation of possible hazards caused by the enrichment of algal toxins in the marine food chain. Different clinical types of algae-related poisoning have attracted scientific ...
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Validation of USEPA Method 524.2 Using a Stratum PTC, AQUATek 100 Autosampler, and Perkin-Elmer Clarus 600 GC/MS
Abstract The US EPA developed Method 524.2¹, “Measurement of Purgeable Organic Compounds in Water by Capillary Column Gas Chromatography/Mass Spectrometry”, for identifying and measuring purgeable volatile organic compounds (VOC) in surface water, groundwater, and drinking water. Due to the required sensitivity of this method, the use of purge and trap gas chromatography is ...
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Validation of USEPA Method 524.2 Using a Stratum PTC, AQUATek 100 Autosampler, and Perkin-Elmer Clarus 600 GC/MS
Abstract The US EPA developed Method 524.2¹, “Measurement of Purgeable Organic Compounds in Water by Capillary Column Gas Chromatography/Mass Spectrometry”, for identifying and measuring purgeable volatile organic compounds (VOC) in surface water, groundwater, and drinking water. Due to the required sensitivity of this method, the use of purge and trap gas chromatography is ...
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Determination of chlorpyrifos residues in buffalo meat samples using high performance liquid chromatography
Chlorpyrifos, an organophosphorous compound, is widely used to improve the yield of agricultural produce in India. Public concern over pesticide residues in foods has been increasing such that it has become a significant food safety issue. The present study was conducted to screen 254 buffalo meat samples collected from different slaughter houses for chlorpyrifos residues. The putative ...
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Using Nitrogen Purge Gas for US EPA Drinking Water Methods
Abstract The USEPA developed Method 524.4, “Measurement of Purgeable Organic Compounds in Water by Capillary Column Gas Chromatography/Mass Spectrometry (Using Nitrogen Purge Gas)”, for identifying and measuring purgeable volatile organic compounds in surface water, groundwater, and drinking water. Due to the economic concerns associated with the cost of helium, this method allows for ...
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WHY PEEK MATERIAL IS WIDELY USED IN SEALING TERMINAL & CONNECTOR APPLICATION IN OIL&GAS FIELD?
PEEK connector, we also call it PEEK sealing terminal or HTHP connector, just as its name implies which the connector is made from PEEK material combining with metal contact and using glass sintered technology sealing PEEk material & contact so it has perfect air leakage performance. In wellhead, gate valve requires to PEEK terminal for sealing, or tubing head spool for connect gauge or ...
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Comparison of different anion-exchange chromatography resins for the purification of cyanobacterial microcystins
For the first time, different types of diethylaminoethyl (DEAE) anion-exchange resins, widely used in previous studies, were investigated to determine the most effective resin for the purification of microcystins (MCs). MCs were extracted from freeze-dried Microcystis aeruginosa cells that had been harvested from the Bueng Nong Khot reservoir, Khon Kaen, Thailand. The toxins were precipitated ...
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WHY PEEK MATERIAL IS WIDELY USED IN SEALING TERMINAL & CONNECTOR APPLICATION IN OIL&GAS FIELD?
PEEK connector, we also call it PEEK sealing terminal or HTHP connector, just as its name implies which the connector is made from PEEK material combining with metal contact and using glass sintered technology sealing PEEk material & contact so it has perfect air leakage performance. In wellhead, gate valve requires to PEEK terminal for sealing, or tubing head spool for connect gauge or ...
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Purification of natural products - Case Study
“Due to its versatility, the PrepChrom C-700 is a valuable instrument in our natural product isolation based research group, where preparative techniques such as column chromatography, flash chromatography and preparative HPLC are used on a daily basis.” Customer name Prof. Dr. Timo Niedermeyer Company / Institution University of Tübingen, Germany Product lines Preparative ...
By BUCHI
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Low-level Drinking Water Analysis of 1,2,3-Trichloropropane by Purge and Trap Concentration and GC/MS
Abstract 1,2,3-Trichloropropane (TCP) is a common industrial solvent with applications as a paint and varnish remover, degreasing agent, and an intermediate in pesticides. The California Department of Public Health recognizes TCP as a carcinogen with a notification level of 0.005 µg/L in drinking water.1 For low level drinking water analysis of volatile organic compounds (VOCs), the USEPA ...
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