ms columns Articles

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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 ...

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 ...

Proton-Transfer-Reaction Time-of-Flight Mass Spectrometry (PTR-TOFMS): Latest Improvements in Selectivity and Sensitivity

by Ionicon Analytik Ges.m.b.H.  (Dec. 8, 2014)

Proton-Transfer-Reaction Mass Spectrometry (PTR-MS) is one of the most sensitive methods for real-time gas analysis. One limitation, however, is the lack of unambiguous compound identification, since only the m/z of an ion is acquired. We recently tested several approaches of increasing the selectivity via varying the reduced electric field ...

Development and Applications of a Combined FastGC Proton-Transfer-Reaction Mass Spectrometry Instrument

by Ionicon Analytik Ges.m.b.H.  (Dec. 8, 2014)

Proton-Transfer-Reaction Mass Spectrometry (PTR-MS). which is a very sensitive method for real-time gas analysis, has become a widespread technology in the food and flavor research area for over more than 15 years [1]. However, as in this field often isomeric compounds have to be identified and quantified independently, there is a need for ...

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/Supelco  (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 ...

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 ...

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 ...

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 ...

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, ...

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