Nitrogen Organic Compounds: Emergent Chemicals in Landfill Leachate

The main purpose of this work is the extraction of nitrogen organic compounds from landfill lechate samples. The samples were subjected to liquid chromatography in preparative scale, using XAD-4TM , Amberlyst A-27TM and A-15TM resins as stationary phases. The relative area of the chromatographic peaks of the nitrogen compounds were of 8.3 (XAD-4TM), 5.4 (A-27TM) and 62.6% (A-15TM). The selective retention was studied by the employment of a standard solution (10 mg L-1) of N-methyl-4ethylbenzenesulfonamide (EMBS), N-methyl caprolactm (NMC) and N-butyl-4methlylbenzenesulfonamide (BMBS). Those standards compounds were retained mainly in the XAD-4TM column, suggesting that the majority of the nitrogen compounds in the sample are strongly basic. The compounds were identified by the GC-MS (Gas Chromatography with Mass Spectrometer detector) library (Wiley). Hazardous nitrogen compounds like N,N alkylformamides, alkylpyridines and N,N alkylbenzesulfonamides were identified.