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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: Assessing SPME and high‑capacity sorptive extraction
This study describes the use of the new Centri sample automation and concentration platform to extract and quantify trace-level odorants in water, using two headspace sampling methods – multi-phase SPME fibers or HiSorb high-capacity sorptive extraction probes – in conjunction with trap-based preconcentration and GC–MS. Performance for the five target analytes was within the requirements of ISO 17943 and GB 5749, with linearities >0.996 and mean MDLs of the order of 1 ppt.
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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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UK
UK
Markes International Ltd
Gwaun Elai Medi-Science Campus
Llantrisant
RCT, CF72 8XL
UK
Tel: +44 (0)1443 230935
Germany
Germany
Markes International GmbH
Bieberer Straße 1-7
63065 Offenbach am Main
Germany
 
Tel: +49 (0)69 6681089-10
USA (West)
USA
Markes International, Inc.
2355 Gold Meadow Way
Gold River, Sacramento
California 95670
USA
Tel: +1 866-483-5684 (toll-free)
China
China
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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