Notes. Cross-contamination of water samples taken for analysis of purgeable organic compounds

Levine, Steven P.; Puskar, Mark A.; Dymerski, Paul P.; Warner, B.J.; Friedman, Charles S.

doi:10.1021/es00108a013

Cited by 9 publications

(2 citation statements)

References 2 publications

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“…Simulating sample-handling procedures followed in the field (15,16), the 2% methanol solutions were transferred to 40-mL hermetically sealed vials. Each vial was filled to overflowing and sealed with a septum screwcap with the propylene-tetrafluoroethylene side of the septum in contact with the solution.…”

Section: Sample Preparation Distribution and Analysismentioning

confidence: 99%

Recovery of several volatile organic compounds from simulated water samples: effect of transport and storage

Friedman¹,

Schroder²,

Brooks³

1986

Environ. Sci. Technol.

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W Solutions containing volatile organic compounds were prepared in organic-free water and 2% methanol and submitted to two US. Geological Survey laboratories. Data from the determination of volatile compounds in these samples were compared to analytical data for the same volatile compounds that had been kept in solutions 100 times more concentrated until immediately before analysis; there was no statistically significant difference in the analytical recoveries. Addition of 2% methanol to the storage containers hindered the recovery of bromomethane and vinyl chloride. Methanol addition did not enhance sample stability. Further, there was no statistically significant difference in results from the two laboratories, and the recovery efficiency was more than 80% in more than half of the determinations made. In a subsequent study, six of eight volatile compounds showed no significant loss of recovery after 34 days.

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Section: Sample Preparation Distribution and Analysismentioning

confidence: 99%

Recovery of several volatile organic compounds from simulated water samples: effect of transport and storage

Friedman¹,

Schroder²,

Brooks³

1986

Environ. Sci. Technol.

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“…The contamination of analytical sample solutions by migration from storage materials can yield artifact peaks which may interfere with quantitation and identification of the analytes. Apart from the widely known problem of sample contamination by plasticizers such as phthalates or adipates originating from plastic materials, artifacts can also be incurred by rubber additives discharging from vial closures. − During gas chromatography/electron capture negative ion mass spectrometry (GC/ECNI-MS) and gas chromatography/electron capture detection (GC/ECD) analyses of organochlorine contaminants, we often noticed an abundant peak that eluted in the same retention range as many pesticides or other contaminants (see Figure ) but showed a mass spectrum not corresponding to any analyte. It became clear that this interfering signal originated from crimp-cap vial closures because it was observed only upon employment of these closures.…”

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confidence: 99%

Structure Elucidation of an Artifact Discharging from Rubber-Based Vial Closures by Means of Gas Chromatography/Tandem Mass Spectrometry

Kapp

Vetter

2006

Anal. Chem.

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The use of vial closures equipped with butyl rubber septa may lead to sample contamination by rubber additives discharging from the septum material. In this study, the structure elucidation of an artifact causing intense signals in gas chromatography/electron capture negative ion mass spectrometry (GC/ECNI-MS) and gas chromatographic analyses with electron capture detection is described. Tentative identification of the leached compound was achieved by employing tandem mass spectrometric techniques both in electron capture negative ion and in electron ionization modes. The artifact could thus be characterized as 2-benzothiazolyl-N,N-dimethyl dithiocarbamate, which is a known vulcanization accelerator for rubber. It is conceivable that the identified compound or related substances are also used in other applications. Therefore, two food-related matrixes were investigated for a possible migration of this compound into foods. During these analyses, the tentatively identified rubber additive was detected in an aqueous extract of a rubber seal ring for canning jars. GC/ECNI-MS provided better sensitivity and selectivity than GC/EI-MS for the determination of the rubber additive and other mercaptobenzothiazole-derived substances.

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Quality assurance and quality control of surface water sampling

Stroomberg

Freriks

Smedes³

et al. 1995

Qualilty Assurance in Environmental Monitoring

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Notes. Cross-contamination of water samples taken for analysis of purgeable organic compounds

Cited by 9 publications

References 2 publications

Recovery of several volatile organic compounds from simulated water samples: effect of transport and storage

Recovery of several volatile organic compounds from simulated water samples: effect of transport and storage

Structure Elucidation of an Artifact Discharging from Rubber-Based Vial Closures by Means of Gas Chromatography/Tandem Mass Spectrometry

Quality assurance and quality control of surface water sampling

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