This project continued the work of the previous project of soil dioxin contamination investigation. Since little was known about the soil information of several persistent organic pollutants (POPs) in Taiwan, soil survey of POPs and monitoring of dioxin in Taiwan had been conducted. This project had collected and analyzed for POPs in 300 soil samples and dioxin in 60 soil samples. In potential pollution sources investigation, all soil levels of polychlorinated biphenyl (PCB) in 60 samples were not detected (ND), except for the soil samples around a plant beyond the soil pollution control standards. The results of soil survey of polybrominated diphenyl ethers (PBDEs) showed that PBDEs using plants had an effect on the soil around its. All soil samples of perfluorinated compounds (PFCs) in 24 samples were analyzed; and the trace-level of pentadecafluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) were detected. In baseline survey, all soil samples of PCB, PBDEs and PFCs were detected and lower than the soil pollution control standards in Taiwan or other country. The most widely detected pesticide residue in soil was DDT with a total of 73% of the detectable residue; the levels of DDTs were far lower than the soil pollution control standards. All soil levels of dioxin from potential pollution sources investigation and baseline survey were lower than the soil pollution control standards. Based on the soil dioxin investigation results over the years, medium- and long-term soil survey and monitoring plan for POPs in Taiwan was proposed, including the substances on the Stockholm Convention for principal soil survey in the future, suggesting addition of PBDEs and perfluorinated compounds near potential pollution sources for soil monitoring in the future besides dioxin, and the remaining POPs which investigated this year carrying out baseline monitoring (except for pesticides), planned the monitoring points for dioxins and other POPs and advised on the management of soil POPs.

soil survey, Persistent Organic Pollutants, monitoring management