||Precision and Accuracy in the Determination of Organics in Water by Fused Silica Capillary Column Gas Chromotography/Mass Spectrometry and Packed Column Gas Chromatography/Mass Spectrometry.
Eichelberger, J. W. ;
Kerns, E. H. ;
Olynyk, P. ;
Budde, W. L. ;
||Environmental Monitoring and Support Lab.-Cincinnati, OH.
Water analysis ;
Organic compounds ;
Water pollution ;
Gas chromatography ;
Mass spectroscopy ;
Solvent extractions ;
Water pollution detection ;
Fused silica capillary column gas chromatography ;
Packed column gas chromatography
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Two general methods for the identification and measurement of organic compounds in water are compared. One method employs packed column chromatography and the other fused silica capillary column chromatography. The two gas chromatography/mass spectrometry (GC/MS) methods use different pH conditions for the liquid-liquid extractions with methylene chloride. Single laboratory total method accuracy and precision data are presented for over 80 analytes in water at the low parts per billion level. With the packed column method 54% of the anlytes have a mean recovery of 70% or more. With the capillary column method, 74% of the analytes have a mean recovery of 70% or greater. Both methods give mean relative standard deviations for concentration measurements of about 20%.