本年度執行南崁溪、中港溪、後龍溪、大安溪、烏溪、鹽水溪、典寶溪、東港溪、蘭陽溪、新城溪等10條河川之底泥採樣及分析，檢測項目包括，短鏈氯化石蠟(SCCPs)、滅蟻樂(Mirex)、壬基酚(NP)及雙酚Ａ(BPA)、鄰苯二甲酸酯類(PAEs)、多溴二苯醚類(PBDEs)及六溴聯苯類(HBBs)、無機砷及有機砷等6類54種檢測物質。完成上列各項檢測分析，獲得4,374筆底泥樣本檢測數據。本年度10條河川底泥中SCCPs濃度以氯含量55.5%者高於氯含量63%者，且皆以低碳數(C10)之濃度較高，建議持續完成其他20條河川底泥SCCPs含量調查，以完整建立國內河川中SCCPs流布背景資料。彙整歷年河川調查檢測結果顯示，河川底泥中滅蟻樂測值均低，建議在完成國內河川中滅蟻樂背景資料建立後可暫停調查，亦無須進行管制作為；河川環境中壬基酚及雙酚Ａ含量雖較過去調查結果有降低趨勢，但仍有部分河川壬基酚測值較國內其他河川偏高許多，或有雙酚Ａ測值升高之情形，建議採取進一步之管制作為如限制壬基酚於工業用清潔劑之含量；以近3年調查結果顯示淡水河本流、新店溪、基隆河、林邊溪底泥DEHP平均濃度仍高於底泥品質指標下限值（增加檢測頻率值）1.97 mg/kg；由兩個階段長期觀察國內PBDEs環境流布結果顯示，國內河川測值並未有下降趨勢，建議應持續監測並檢討管制措施；國內河川底泥有機砷及無機砷測值皆遠低於總砷底泥品質指標下限值，未來應可暫緩調查。而在毒性化學物質環境流布調查之規劃，建議須優先進行環境流布調查的毒化物有19種。本年度並完成「毒性化學物質環境流布調查資訊網站」資料維護，以及「毒性化學物質環境流布調查成果手冊106年版」電子書編印及發行。

This project collected sediment samples from ten Taiwanese rivers (i.e., Nankan River, Jhonggang River, Houlong River, Da-an River, Wu River, Yanshuei River, Dian Bao River, Donggang River, Lanyang River and Shincheng River) to determine concentrations of toxic substances such as short-chain chlorinated paraffins (SCCPs), mirex, nonylphenol (NP), bisphenol A (BPA), phthalate esters (PAEs), polybrominated diphenyl ethers (PBDEs), hexabrominated biphenyls (HBBs), organic and inorganic arsenic. The analysis of sediment samples was completed and 4,374 analyzed data were obtained. The concentrations of SCCPs with 55.5% chlorine content were higher than SCCPs with 63% chlorine content in sediment samples collected from ten Taiwanese rivers in this year. Among eight SCCPs with different chain lengths and chlorine contents, the SCCPs with chain length of C10 showed the highest concentration in sediment samples. Thus, it is necessary to continually investigate the concentrations of SCCPs in sediments of the other twenty Taiwanese rivers in order to establish backgroup levels of SCCPs (belonging to persistent organic pollutants, POPs) in Taiwanese rivers. To integrate the past investigation data, the concentrations of mirex in sediments of 30 Taiwanese major rivers were relatively low. Therefore, the investigation of mirex in river sediments could be suspended and no any control strategy needed. The concentrations of NP and BPA in sediments of 30 rivers almost decreased with time. However, the concentrations of NP in sediments of some rivers were higher than the other rivers or those of BPA increased in this year. Therefore, advanced control strategies for NP and BPA such as set limit level of NP in detergent for industrial usage is recommended. The recent 3-year survey showed that the average DEHP concentrations in sediments from Danshuei River, Sindian River, Keelung River, Linbien River were still higher than 1.97 mg/kg (the lower limit of sediment quality). The two-stage long-term survey on PBDEs in the river environment showed that there was no decreasing trend on the concentrations of PBDEs in the river sediments. It is suggested that environmental monitoring of PBDEs and DEHP should be continued and a review of control policies is needed. The concentrations of organic and inorganic arsenic were much lower than the lower limit of sediment quality for total arsenic. The future work on the environmental survey of toxic substances distribution was proposed and 19 priority toxic substances were suggested for environmental survey. “The database searching website for environmental distribution of toxic substances” was continuously maintained. “The handbook of investigation achievements on the toxic substances distribution in Taiwan, version 2017” was published as an e-book.