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针对海岸带沉积物基质的复杂性,以美国国家标准技术研究院研制的海洋沉积物标准样品(SRM 1944)为研究对象,采用气相色谱-电子捕获检测器进行测定。比较了索氏提取、加速溶剂萃取、超声波辅助提取对其中多氯联苯(PCBs)和12种有机氯农药(OCPs)的提取效率。结果表明:索氏提取的回收率在87.9%~104%之间,加速溶剂萃取在80.1%~106%之间,超声波辅助提取在78.6%~93.8%之间,并用实际海岸带浅层沉积物样品进行验证。
In view of the complexity of the coastal sediment matrix, the marine sediment standard sample (SRM 1944) developed by the National Institute of Standards and Technology (USA) was used as the research object, and the gas chromatography-electron capture detector was used for the determination. The extraction efficiency of polychlorinated biphenyls (PCBs) and 12 kinds of organochlorine pesticides (OCPs) by Soxhlet extraction, accelerated solvent extraction and ultrasonic-assisted extraction were compared. The results showed that the recoveries of Soxhlet extraction ranged from 87.9% to 104%, accelerated solvent extraction ranged from 80.1% to 106%, and ultrasonic assisted extraction from 78.6% to 93.8%. The actual coastal zone shallow sediments Samples are validated.