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Application Note 253: Analysis of volatile organic pollutants in water using headspace–trap GC–MS: Improving on US EPA Method 524.2
This study demonstrates the analysis of a broad range of volatile organic pollutants in drinking water, using headspace–trap sampling to provide practical and performance improvements on the purge-and-trap methodology described in US EPA Method 524.2. Using the Centri automated multi-mode sampling and concentration system, an 83-component standard based on the list in Method 524.2 showed chromatographic performance within the method requirements, as indicated by the mean values for linearity (R2 0.9990), reproducibility (6.9% RSD) and analyte recovery (90%), and a mean detection limit of 0.13 ppb.
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Application Note 255: Quantifying trace odorants in water by GC–MS with trap-based preconcentration: An assessment of high-capacity sorptive extraction
This study describes the use of the new Centri® sample extraction and enrichment platform to extract and quantify trace-level odorants in water, using headspace sorptive extraction with HiSorb probes – in conjunction with trap-based preconcentration and GC–MS. The detection of IPMP, IBMP, 2-MIB, 2,4,6-TCA and geosmin was well below the requirements of ISO 17943 and GB 5749, with linearities >0.996 and mean MDLs of the order of 1 ppt. We also describe the key attributes of HiSorb probes, and discuss the options offered by Centri, which include fully automated immersive sorptive extraction as well as headspace sorptive extraction.
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Application Note 256: Analysis of volatile organic pollutants in water using headspace–trap GC–MS: Maximising performance for ppt-level VOCs
This study demonstrates the analysis of a broad range of trace-level volatile organic compounds in drinking water using the headspace–trap sampling mode of the Centri automated multi-mode sampling and concentration system. Analysis of a 72-component standard mix using GC–MS with selected ion monitoring (SIM) acquisition provided mean detection limits as low as 2 ppt, with excellent mean linearities (R2 0.999), recoveries (97.8%) and repeatabilities (4.7% RSD) – performance that is comfortably lower than required by all major regulations. In addition, tap water was analysed and found to contain a range of VOCs at low-to-medium levels (2–200 ppt), in addition to ppb-level chlorinated compounds.
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Application Note 263: Improving extraction efficiency of SPME on soil samples by using SPME–trap and SPME–trap with enrichment
Solid-phase microextraction (SPME) is a commonly used sampling technique for the profiling of volatile organic compounds from soil. But the technique is limited by the amount of phase available. The introduction of SPME–trap and SPME–trap with multi-step enrichment (MSE) is a step change towards improving sample extraction and reaching lower detection limits while strengthening confidence in compound identification. This application note demonstrates the possibility to extend the number of identified peaks from a complex soil matrix. Utilising SPME–trap with MSE, the number of compounds identified were increased from 544 (SPME–trap) to 656. SPME–trap with MSE is an extension of SPME on the Markes Centri instrument.
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Markes International Ltd
Gwaun Elai Medi-Science Campus
Tel: +44 (0)1443 230935
Markes International GmbH
Bieberer Straße 1-7
63065 Offenbach am Main
Tel: +49 (0)69 6681089-10
USA (West)
Markes International, Inc.
2355 Gold Meadow Way
Gold River, Sacramento
California 95670
Tel: +1 866-483-5684 (toll-free)
Markes Instruments (Shanghai) Co., Ltd
Unit 1002, Building 1
No.418, Guilin Road
Shanghai 200233
P.R. China
Tel: +86 21 5465 1216
Part of Schauenburg International

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