pressurised hot water extraction;
thermal desorption;
polycyclic aromatic hydrocarbons;
sediment;
laboratory-made extraction vessel;
D O I:
10.1016/S0003-2670(02)00543-3
中图分类号:
O65 [分析化学];
学科分类号:
070302 ;
081704 ;
摘要:
A novel extraction vessel was constructed for pressurised hot water extractions (PHWEs). The recoveries of polycyclic aromatic hydrocarbons (PAHs) in sediment obtained with the vessel were comparable with those obtained with a commercial vessel using steam. Recoveries of PAHs obtained by PHWE were compared with recoveries obtained by thermal desorption to evaluate the roles of water and temperature in the extraction. Liquid water and steam were tested in a temperature range of 200-300degreesC and thermal desorption with nitrogen at temperatures 200-350degreesC. At 300degreesC, the best results were obtained with steam, while the recoveries obtained with liquid water and nitrogen were comparable to each other. The recoveries achieved with nitrogen at 300degreesC were surprisingly good, about 85% of the values obtained with steam. Recoveries were good for most of the PAHs relative to the ceritified reference values and they were in accord with values obtained earlier in our laboratory. (C) 2002 Elsevier Science B.V. All rights reserved.