摘要
采用液液萃取法和C18固相膜萃取法对水样进行前处理,利用气相色谱/质谱联用技术进行分析测定,通过回收率实验和精密度实验对两种前处理方法进行比较。在加标回收实验中,液液萃取法的加标回收率普遍低于65%,不符合USEPA标准(70%~130%),而C18固相膜萃取法的加标回收率都在70%~120%之间,符合UsEPA标准;在精密度实验中,液液萃取法的相对标准偏差在30%以内,而C18固相膜萃取法的相对标准偏差均不超过20%,两者均符合USEPA标准(〈30%),但是C18固相膜萃取法的实验效果更好。从实验中得出,C18固相膜萃取法是地下水样较好的前处理方法。利用所研究的方法分析了北京市某生活区的地下水样,在该水样中检出了63种有机化合物,包括1种酯类、1种醇类、2种酸类、2种酚类、2种氯代烃、25种苯系物、4种烯烃、14种烷烃和12种多环芳烃。
The groundwater samples are pretreated respectively by means of both the liquidliquid extraction and the C18 membrane disk extraction, analyzed with the GS/MS. The recovery and precision experiment are both conducted to compare the two pre-treatment methods. The recovery of the liquid-liquid extraction with standard samples are generally smaller than 65%, while those of the later with that all vary from 70% to 120%. The relative standard deviations of the liquid-liquid extraction are all less than 30%, while those of the C18 membrane disk extraction are less than 20%. In the recovery experiment spiked with standard samples, The results show that the C18 membrane disk extraction is optimal. The groundwater samples are analyzed and 63 organic compounds are detected.
出处
《质谱学报》
EI
CAS
CSCD
2006年第3期140-147,共8页
Journal of Chinese Mass Spectrometry Society
基金
国家自然科学基金项目40372109
40572146
国家科学技术部项目2002BA906A28-1B共同资助