The Taiwan standard sampling methods usually require external power and controller. The methods usually collected a small amount of discrete samples which were subsequently analyzed using standard methods. If the data meet the requirements of quality control and quality assurance, we can identify law-violating contaminating source in due time. For contaminant concentration varying with time, we need to prolong sampling time and increase sampling frequency to assist identifying the contaminating source at the price of heavier workload and higher expense. Similar problems are encountered when analyzing ultratrace contaminants, bioaccumulating and bioavailable toxic substances. Passive accumulation devices (PADs) are free of external power and human intervention. PADs are suitable for consecutive longtime sampling and have been used in western countries for risk assessment of biological exposure. Therefore this proposal is to develop a technique for long time passive accumulation, including PUF disk and semipermeable membrane device (SPMD).
We collected 23 relevant papers first and provided their Chinese and English abstract. The papers demonstrate that the PUF disk (PUF disk, PolyUrethane Foam) and SPMD (SemiPermeable Membrane Device) (SPMD, SemiPermeable Membrane Device) are suitable for monitoring the POPs (Persistent Organic Pollutants) in ambient air. The PUF disk uses PUF as sequestration material and is free of using semipermeable membrane. The SPMD uses 180 l, 99% triolein as sequestration material and LDPE (Low Density PolyEthylene) tube as semipermeable membrane. The result from on-site calibration experiment demonstrates that the PUF disk producing results in good agreement with those from active sampler and is more suitable for ambient air PCDD/Fs (PolyChlorinated Dibenzo-p-Dioxins/DibenzoFurans) and Co-PCBs (Co-planar PolyChlorinated Biphenyls) sampling. Using the saturating curves from simulating experiment to quantify real samples, the tendency of estimated PCDD/Fs and Co-PCBs concentration are similar to those obtained by standard method of active sampling. Furthermore, the congener concentration distribution is also similar among the two methods. In summary, this research demonstrates that using PUF disk PADs sampling at target area is capable of semi-quantitatively determine ambient air PCDD/Fs and PCBs concentrations. Furthermore, analyzing the congener concentration distribution profiles might assist trace the origin of suspected emission sources.