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The Determination of Volatile Organic Compounds from EPA Method 524.2 using Purge-and-Trap Capillary Gas Chromatography, ECD, and FID

1992; Oxford University Press; Volume: 30; Issue: 7 Linguagem: Inglês

10.1093/chromsci/30.7.247

1945-239X

H. Kessels, W. Hoogerwerf, Jürgen Lips,

Analytical Chemistry and Sensors

The investigation of a commercial device for the determination of 71 volatile organic compounds (VOCs) in water is described. Halogenated aliphatic and aromatic compounds, including EPA Method 524.2 as well as simple hydrocarbons like heptane, are investigated. This is done using a purge-and-trap extraction technique interfaced with capillary gas chromatography for high resolution capabilities. The direct interfacing is accomplished without splitting of the purge-and-trap desorption carrier flow. The process of sampling, purging and trapping, injection, and analysis of the samples is automated and takes 70 minutes. With 10-mL water samples, concentrations ranging from 0.1 to 10 μg/L of the individual compounds are analyzed. The procedure is applied to drinking and reagent water. The mean method accuracy varies from 99 to 103%, and the mean method precision varies from 3.8 to 9.5%. With the exception of some analytes, the method detection limits ranges f r om 0.09 to 0.01 μg/L .