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Questions from Afar
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John W. Dolan
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Retention-time drift, temperature control and broad peaks from a new column are the topics of this month's discussion.
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Can We Trust Experimental Standard Deviations?
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Veronika R. Meyer
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The statistical nature of experiments leads to the fact that standard deviation (SD) of replicate analysis is not constant but a number with some variability: a standard deviation has its own standard deviation. As a consequence, a SD calculated from three experiments is not rugged and even SDs from ten experiments show a great variability. Analysts should be aware that with 100 or more the results have low scatter
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Screening of Pollutants in Water Samples and Extracts from Passive Samplers using LC–MS and GC–MS
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A. Gravell
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G.A. Mills
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W. Civil
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This article describes the GC–MS and LC–MS screening methods developed by the Environment Agency for England and Wales for the analysis of both low-volumn water samples and extracts obtained from various designs of passive samplers.
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