Adsorption of N-Nitrosodiethylamine and N-Nitrosodimethylamine on Activated Carbon:A Pre-Concentration Procedure for Gas Chromatographic Analysis

摘要

In this study,a rapid pre-concentration procedure,which employs powdered activated carbon as a clean-up and pre-concentration material,is described for the gas chromatographic analysis of N-nitroso-diethylamine (NDEA) and N-nitrosodimethylamine (NDMA) in aqueous solutions.It was found that powdered activated carbon is suitable for the adsorption of volatile N-nitrosamine compounds from aqueous solutions.Adsorption efficiency with spiked beer samples (alcohol content approx=5% v/v) was found to be 80.5% (NDMA) and 89.4% (NDEA) and recovery of extraction from activated carbon was calculated as 82.1% (NDMA) and 89.7% (NDEA),respectively.The effect of 100mug mL~(-1) of tannic acid on the adsorption was also studied,and no significant effect on the adsorption and extraction of volatile N-nitrosamine compounds was found.