沉积物中多溴联苯醚快速测定技术

Rapid determination of polybrominated diphenyl ethers in sediment

建立了沉积物中多溴联苯醚快速测定方法。沉积物样品采用正己烷-丙酮混合溶剂超声提取,提取液经减压浓缩后,在充满氧气的燃烧瓶中燃烧,使多溴联苯醚分解成溴离子,采用溴离子选择电极测定。结果表明,沉积物中十溴联苯醚在加标浓度为100-5000μg/kg时,方法回收率为70.27%-97.49%,相对标准偏差RSD<15%,方法定量限为100μg/kg。

A method was established for determining the polybrominated diphenyl ethers （PBDEs） in sediment.The sediment samples were subjected to ultrasonic extraction using n-hexane/acetone as solvent.The extract was concentrated and combusted in the combustion flask which was filled with oxygen.Polybrominated diphenyl ethers were decomposed into bromine ion which was then determined by bromide ion selective electrode.The result showed that,when the addition level was 100 μg/kg,1000 μg/kg and 5000 μg/kg,the recovery was in the range of 70.27%-97.49%,and the relative standard deviation（RSD） was less than 15%.The quantification limit of the method was 100 μg/kg.