本年度執行基隆河、頭前溪、客雅溪、大甲溪、濁水溪、北港溪、朴子溪、將軍溪、二仁溪、秀姑巒溪等10條河川之底泥採樣及分析，檢測項目包含滅蟻樂、六溴環十二烷、壬基酚及雙酚A、鄰苯二甲酸酯類物質、多溴二苯醚類物質、無機砷及有機砷。完成上列各項檢測分析，獲得2,160筆底泥樣本檢測數據。集結歷年河川調查檢測結果顯示，滅蟻樂在河川底泥測值不高，但建議持續完成30條河川調查，作為國內河川POPs背景資料之建立；根據已完成30條河川六溴環十二烷調查資料顯示，國內河川底泥濃度不高，可暫緩調查後另作POPs之長程調查規劃；河川環境壬基酚及雙酚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；以近3年調查結果顯示淡水河本流、新店溪、基隆河、南崁溪、鹽水溪、典寶溪、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濃度較無機砷低，且無機砷（三價砷及五價砷）測值皆遠低於總砷底泥品質指標下限值。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22種。本年度並完成「毒性化學物質環境流布調查資訊網站」資料維護及增列科普版資料，以及「毒性化學物質環境流布調查成果手冊105年版」電子書編印及發行。

This project collected sediment samples from ten Taiwanese rivers (i.e. Keelung River, Toucian River, Keya River, Dajia River, Jhuoshuei River, Beigang River, Puzih River, Shincheng River, Erren River and Siouguluan River) to determine concentrations of toxic substances such as mirex, hexabromocyclododecane (HBCD), nonylphenol (NP), bisphenol A (BPA), phthalate esters, polybrominated diphenyl ethers (PBDEs), organic and inorganic arsenic. The 2,160 analyzed data were completed. According to the past investigation, the concentrations of mirex in sediments of 20 Taiwanese major rivers were relatively low, but it is necessary to complete analysis of mirex in sediments of 30 major rivers for establishing the backgound data of mirex (belonging to persistant organic pollutants, POPs) in Taiwan. The concentrations of HBCD in sediments of 30 major rivers were relatively low, indicating the investigation on this compound could be stopped for planing investigation on the other POPs. The concentrations of NP and BPA in sediments of 30 rivers mostly decreased with time. However, the concentrations of NP and BPA in sediments of some rivers were relatively high or decreased in the past but increased in this year. The recent 3-year survey showed that the average DEHP concentrations in sediments from Danshuei River, Sindian River, Keelung River, Nankan River, Yanshuei River, Dian Bao 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 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. The future work on the environmental survey of toxic substances distribution was proposed and 22 priority toxic substances were suggested for environmental survey. “The database searching website for environmental distribution of toxic substances” was maintained and the information on the section of popular science was increased. “The handbook of investigation achievements on the toxic substances distribution in Taiwan, version 2016” was published as an e-book.