Elimination of Ammonia interference in the Purge-and-Trap GC Determination of Organohalogens in Water

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Abstract
Ammonia has been shown to be a major interferent in the gas chromatographic analysis of trihalomethanes and other organohalogen compounds when a purge-and-trap technique is used in conjunction with Tenax GC packed columns. This ammonia, which may be derived from the water samples themselves and/or from the reduction of monochloramine, can be effectively removed by a pretreatment step in which the samples are passed through a mini-ion exchange column prior to purging, trapping, and chromatographic analysis. The use of the ammonia removal column does not result in a significant change in the sample preparation time. The precision estimates for the procedure employing the ammonia removal column were the same as for the standard purge-and-trap analytical procedure in the absence of ammonia.

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