Analytical Method for PCDDs/PCDFs in Environmental Water

—Preconcentration Method for Water Sample—

Abstract

This paper reviews analytical methods, especially those involving sample preconcentration, for the determination of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) in environmental water samples. In general, the analysis of these compounds is difficult, due to a combination of their generally low environmental levels and their physio-chemical properties e.g. low aqueous solubility and strong preference for particulate absorption. A large volume liquid liquid extraction and preconcentration system using an adsorbent resin e.g. XAD, C₁₈, or a polyurethane foam plug, to extract PCDD/PCDFs from water samples has been reported. To separate the“truly dissolved” PCDD/PCDFs from that adsorbed by particulate matter in large volume of water, continuous centrifugation or filtration is available. Since there is little published data in this area, it is necessary to develop a reliable and easy to use preconcentration system in order to collect reliable data on PCDD/DF concentrations in natural water and so elucidate the behaviour of these chemicals in the environment.