| dc.description.abstract | Dated sediment cores provide the reference record to investigate the historical input of persistent organic pollutants into the environment and identify possible sources in the vicinity area. In this study, two sediment cores, one at Feitsui Reservoir and the other at Sun Moon Lake were taken in 2008 and 2009 in north and middle of
Taiwan, respectively. Samples were Soxhlet-extracted and cleaned up by the CAPE Technologies coupled carbon-acid silica column, and the concentrations of seventeen 2,3,7,8-polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), twelve dioxin-like polychlorinated biphenyls (DLPCBs), and twenty-four polybrominated diphenyl ethers (PBDEs) were measured by HRGC/HRMS in SIM mode. The concentrations of PCDD/Fs and DLPCBs in different depth of sediment cores ranged from 0.036 to 2.63 ng WHO-TEQ/kg and 0.021 to 0.251 ng WHO-TEQ/kg, respectively, at Feitsui Reservoir. The high values were detected from 1998 to 2000. The results indicated that the increase in the PCDD/Fs and
DLPCBs concentration of the sediment core was related to the operation of municipal solid waste incineration (MSWI) in the vicinity area of the Feitsui reservoir. Additionally, the concentrations of PCDD/Fs and DLPCBs measured in sediment core collected at Sun Moon Lake ranged from 1.14 to 4.42 ng WHO-TEQ/kg and 0.005 to 0.305 ng WHO-TEQ/kg, respectively. The high values were detected from 1971 to 1978. The results indicated that the variation of
PCDD/Fs and DLPCBs contents in different depth of sediment core is similar to that of the pesticides (DDT, PCP and CNP) usage in Taiwan. OCDD contributed more than 95% to the total PCDD/Fs concentration in all samples, while PCB-118
was the most dominant congener of DLPCBs, followed by PCB-105 and PCB-77. In addition, the concentrations of 24 tri- through Deca-BDE congeners in the sediment core collected at Feitsui Reservoir range from 0.129 to 6.75 ng/g,
followed by BDE-209, BDE-47 and BDE-99. The sediment core collected at Sun Moon Lake range from 0.041 to 2.16 ng/g, followed by BDE-209, BDE-207 and BDE-183.
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