120th General Meeting of the KCS

Type Poster Presentation
Area Environmental Energy
Room No. Exhibition Hall 2+3
Time 10월 19일 (목요일) 11:00~12:30
Code ENVR.P-516
Subject Risk assessment of PCDD/Fs and DL-PCBs in Korean population
Authors Yu-Gyeong Kang, YOON-SEOK CHANG *
Division of Environmental Science and Engineering, Pohang University of Science and Technology, Korea
Abstract Various contaminants have persisted in environmental matrices and affected to ecosystem through the food chain from their sources to human. Especially, the concerned contaminants, emitted by human activity and industrial use, have been studied for their fate and estimated dietary intakes such as polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), dioxin-like polychlorinated biphenyls (DL-PCBs). Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) and polychlorinated biphenyls (PCBs) are representative registered initial persistent organic pollutants (POPs) in the Stockholm Convention, and accumulates through food consumption. Twenty-nine congeners among PCDD/Fs and DL-PCBs are concerned due to their high toxicity. Therefore, World Health Organization (WHO) has set toxic equivalency factor (TEF) value and managed for reducing of exposure (van den, B. et al., 2006). Since both PCDD/Fs and DL-PCBs have similar toxic properties, their exposure though food consumption are managed by integrated tolerable daily intake (TDI) (Becher, G. et al., 2004). In this study, we investigated to evaluate the risk of PCDD/Fs and DL-PCBs among 2410 cases of 257 food items which are most consumed in Korea. This project was suggested by Ministry of Food and Drug Safety (MFDS) in Korea government as the largest scale monitoring that has been attempted to date. As a result of the risk assessment for the general population, we have examined whether the overall exposure can be estimated based on only the highest exposure contribution items group. These results were calculated that we can estimate the approximate exposure by monitoring only the highest exposure contribution items group instead of the large scale monitoring such as this study. Over the evaluation of only the general population, the dietary intake for each age group was separately assessed for the risk of subgroups. In particular, we considered the information of risk assessment through the calculation of dietary intake for infants and pregnant women that might be vulnerable to toxic exposure. In general, POPs such as PCDD/Fs and DL-PCBs are mainly detected in fishery products including fish and shellfish. In this study, the levels of PCDD/Fs and DL-PCBs were in order of fishery, meat, processed and agricultural products. Fishery products were shown high concentrations in other previous studies (Shin, E.-s. et al., 2016). These results were due to the fate and characteristics of PCDD/Fs and DL-PCBs in the environment. PCDD/Fs and DL-PCBs are first introduced into the aquatic environment after they are released into the environment. And it can be attached to sediment and then dissolves into the aquatic ecosystem through decomposition, diffusion and resuspension. In land ecosystems, these compounds can be accumulated preferentially fat tissue in livestock over a long period of time. Moreover, PCDD/FS and DL-PCBs would be detected in the obtained milk and egg from contaminated livestock. However, the agricultural products which have very low fat contents showed the low levels of PCDD/Fs and DL-PCBs because the high Kow value of these compounds and hydrophobic property. The risk assessment for PCDD/Fs and DL-PCBs were estimated based on their concentration and food intake in populations. In addition, the exposure levels of the PCDD/Fs and DL-PCBs to populations were calculated by considering of the average dietary habits and body weight of the specific subgroup (e.g., age, pregnant and lactating women, and extreme consumer of 95 percentile). The daily intake and risk against TDI for all groups were evaluated based on the TDI in WHO (4 pg-TEQ/kg b.w./day).
E-mail ygkang74@postech.ac.kr