ms column Articles

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2.1 mm ID micro carbamates column ideal for LC-MS confirmation

by Pickering Laboratories, Inc.  (Jun. 10, 2010)

Post-column derivatization of carbamates with hydroxide and OPA is the method of choice for the detection of carbamates because of its high selectivity and high sensitivity (US EPA 531.1 & AOAC 985.23).  To confirm the finding of carbamates in the tested samples, there are various possibilitites: To confirm the finding of carbamates in ...

Rxi-624Sil MS Exceptionally Inert, Low Bleed Columns for Volatiles Analysis

by Restek Corporation  (May 24, 2012)

- Optimized selectivity for volatiles and polar compounds ensures good separations. - Highly inert columns improve accuracy and allow lower detection limits, even for active compounds. - Most thermally stable 624 column available; low bleed, fully MS compatible. While mid polarity 624 columns are widely used for analyzing polar analytes and ...

Binary vs. Quaternary Pumps: High Pressure Mixing vs. Low Pressure Mixing

by Waters Corporation  (Jun. 27, 2016)

Welcome to the next installment in my series on binary vs. quaternary pumps for liquid chromatography! In my previous post, I discussed how gradients are created as well as the importance of having accuracy and precision in your gradient. ...

Target GC-MS Analysis using Accelerated Column Heating and Interactive Deconvolution Software

In diverse fields ranging from environmental samples to complex fl avor preparations, high performance, high resolution capillary gas chromatography/mass spectrometry, GC-MS, has become the preferred technique for identifying and quantifying target compounds at trace levels. Many of these samples are characterized by very complex matrices, which ...

Aflatoxin & ochratoxin sample preparation columns

by Pickering Laboratories, Inc.  (Jun. 10, 2010)

Simultaneous Analysis of Aflatoxins and Ochratoxin A - Sample Preparation Aflatoxins and Ochratoxin A are produced by fungi, e.g. Aspergillus and Penicillium species. Therefore both toxin types are found together in many foods and animal feeds, e.g. cereals. Thus it is appropriate to analyze one extract for the occurrence of both mycotoxins in a ...

Advances in Bromine Speciation by HPLC/ICP-MS

by PerkinElmer, Inc.  (Oct. 28, 2011)

Bromine is a natural component found in waters, most commonly as the bromide ion, Br-. A common procedure for purifying drinking waters is treatment with ozone to kill bacteria. A byproduct of ozonolysis is the conversion of bromide to bromate (BrO3-), a known carcinogen. Therefore, a need exists to measure both bromide and bromate in drinking ...

Lower Detection Limits with Ground-Breaking Column Technology

by Restek Corporation  (May 24, 2012)

Rxi technology unifies outstanding inertness, low bleed, and high reproducibility into a single high performance column line. Take variation out of the equation and get the most consistent results for trace-level analysis with Rxi columns. phases available Rxi-1ms Rxi-1HT Rxi-5ms Rxi-5Sil MS Rxi-5HT Rxi-XLB ...

GC-MS Analysis of Polychlorinated Dibenzodioxins and Polychlorinated Dibenzofurans

by Sigma-Aldrich Co., LLC  (Jun. 5, 2012)

Polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) consist of 210 different compounds with varying degrees of toxicity, and the 17 congeners with chlorine substitution in the 2,3,7,8 positions are considered the most toxic. This chromatogram illustrates the separation of a 17 component 2,3,7,8-substituted PCDD and ...

Application of a GPC-LC-MS/MS method for the determination of 31 mycotoxins in edible oils

by Pickering Laboratories, Inc.  (Jun. 10, 2010)

Gel Permeation Chromatography (GPC) is widely used for sample clean up in mycotoxin analysis. The most commonly described methods use GPC columns packed with SX-3 BioBeads suitable for cleaning Zearalenone, Aflatoxins and Trichothesenes from edible oils and fatty matrices. Separation of Fumonisins from the oil fraction are inadequate with this ...

A Simple and Ultra-Sensitive LC/MS/MS Method for Analysis of N-Methyl Carbamates in Water

IntroductionN-methyl carbamate pesticides are widely used due to their broad range of activity. Water sources can be polluted bycarbamates through surface water runoff from areas such as agriculture fields, golf courses, and residential properties.Human and animal studies have suggested that long-term, low-level exposure to carbamates can cause ...

LC/MS/MS analysis of metabolites of synthetic Cannabinoids JWH-018 and JWH-073 in Urine

by Restek Corporation  (May 24, 2012)

Abstract A liquid chromatographic method was developed to resolve a comprehensive set of metabolites of JWH-018 and JWH-073. In addition to the chromatographic analysis method, an extraction method was developed to recover a broad range of synthetic cannabinoid metabolites, including carboxylic acid metabolites that are not traditionally recovered ...

US EPA Method 525.2 Semivolatiles by GC-MS on the Supelco SLB™-5ms

by Sigma-Aldrich Co., LLC  (Dec. 31, 2008)

US EPA Method 525.2 describes the procedure for the extraction and analysis of semivolatile organic compounds from drinking and source water. The compound list includes polynuclear aromatics, phthalates, pesticides, and polychlorinated biphenyls.  This application illustrates the separation of a majority of the single peak analytes listed in ...

Fast LC-MS-MS Quantitation of N-Methyl Carbamate Pesticides in Food using Bond Elut® Plexa™ and Pursuit® XRs C18

A fast quantitation method for the analysis of N-Methyl Carbamate pesticide residues in vegetables and grains has been developed with Bond Elut Plexa clean-up, Pursuit XRs C18 columns, and 320 LC-MSMS. High recoveries were obtained for most carbamates screened in all matrices tested at 1 ppb levels. Good linearity of the calibrationcurves was ...

Fast LC/MS/MS Quantitation of N-Methyl Carbamate Pesticides in Food Using Bond Elut™ Plexa™ and Pursuit™ XRs C18

AbstractA fast quantitation method for the analysis of N-methylcarbamate pesticide residues in vegetables and grainshas been developed with Bond Elut Plexa clean-up, Pursuit XRs C18 columns, and 320-MS LC/MS/MS. Highrecoveries were obtained for most carbamates screened in all matrices tested at 1 ppb levels. Good linearity of thecalibration curves ...

USLC columns put the right tools in your LC method development toolbox

by Restek Corporation  (May 24, 2012)

Understanding Selectivity in Reversed Phase Separations – A Simplified Approach to HPLC and UHPLC Column Selection The most significant influence on chromatographic peak separation, or resolution, is column selectivity. Unfortunately, column selectivity is also the least understood and most underutilized parameter. To improve selectivity, ...

Studies on coal flotation in flotation column using statistical technique

by Inderscience Publishers  (Mar. 4, 2009)

Flotation of Indian high ash coking coal fines to obtain clean coal has been reported earlier by many authors. Here an attempt has been made to systematically analyse factors influencing the flotation process using statistical design of experiments technique. Studies carried out in a 100 mm diameter column using factorial design to establish ...

Fast GC-MS Analysis of US EPA Method 8270D Semivolatiles Using Supelco SLB-5ms

by Sigma-Aldrich Co., LLC  (Dec. 31, 2006)

US EPA Method 8270D specifies a procedure for the determination of semivolatiles in solid waste and ground water samples. The method specifies that all analyses must be completed within 12 hours of meeting specific MS tune criteria. In this application, the principles of fast GC were applied to analyze a typical 8270 analyte list in under 8.5 ...

Analysis of Organophosphorus and Organonitrogen herbicides in water using GC/MS with selected ion recording

by PerkinElmer, Inc.  (Oct. 28, 2011)

Laboratories monitoring trace level pesticides and herbicides by gas chromatography/mass spectrometry (GC/MS) frequently utilize Selected Ion Recording (SIR) techniques to maximize analytical sensitivity for quantification. With analytical standards, precision is limited to a large extent only by the autosampler and other instrumental effects. ...

Determination of VOCs in water using static headspace GC/MS with simultaneous full scan and selective ion recording

by PerkinElmer, Inc.  (Oct. 28, 2011)

The combination of static headspace sample introduction and gas chromatography/mass spectrometry (HS/GC/MS) provides the analyst with a powerful, fully automated technique for the determination of trace volatile organic compounds (VOCs) in water. Samples may be hermetically sealed in the headspace vial at the point of sampling. This approach ...

GC-MS Analysis of Volatile Organic Compounds in Wastewater According to US EPA Method 624

by Shimadzu Scientific Instruments Inc  (Dec. 1, 2014)

Environmental contamination has been at the forefront of government policy and regulation since the US EPA was established in 1970. Over the years the US EPA has developed, published, and updated multiple methods for analysis of environmental pollutants, and single-quadrupole gas chromatography-mass spectrometry (GCMS) has long been the technique ...

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